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Based on the idea and the provided source code of Andrej Karpathy (arxiv-sanity)
Ratios of helicity amplitudes for exclusive $\rho^0$ electroproduction on transversely polarized protons (1702.00345)
The HERMES Collaboration: A. Airapetian, N. Akopov, Z. Akopov, E.C. Aschenauer, W. Augustyniak, S. Belostotski, H.P. Blok, A. Borissov, V. Bryzgalov, G.P. Capitani, G. Ciullo, M. Contalbrigo, W. Deconinck, R. De Leo, E. De Sanctis, M. Düren, G. Elbakian, F. Ellinghaus, L. Felawka, S. Frullani, F. Garibaldi, G. Gavrilov, V. Gharibyan, S.V. Goloskokov, Y. Holler, A. Ivanilov, H.E. Jackson, S. Joosten, R. Kaiser, G. Karyan, A. Kisselev, V. Korotkov, V. Kozlov, P. Kravchenko, P. Kroll, L. Lagamba, L. Lapikás, I. Lehmann, P. Lenisa, W. Lorenzon, S.I. Manaenkov, B. Marianski, H. Marukyan, Y. Miyachi, A. Movsisyan, V. Muccifora, A. Nass, W.-D. Nowak, L.L. Pappalardo, A. Petrosyan, P.E. Reimer, A.R. Reolon, C. Riedl, K. Rith, G. Rosner, A. Rostomyan, D. Ryckbosch, Y. Salomatin, A. Schäfer, G. Schnell, B. Seitz, T.-A. Shibata, V. Shutov, M. Statera, A. Terkulov, R. Truty, A. Trzcinski, M. Tytgat, Y. Van Haarlem, C. Van Hulse, D. Veretennikov, V. Vikhrov, I. Vilardi, S. Yaschenko, B. Zihlmann, P. Zupranski
June 13, 2017 hep-ph, hep-ex
Exclusive $\rho^0$-meson electroproduction is studied by the HERMES experiment, using the 27.6 GeV longitudinally polarized electron/positron beam of HERA and a transversely polarized hydrogen target, in the kinematic region 1.0 GeV$^2$<Q$^2$<7.0 GeV$^2$, 3.0 GeV<W<6.3 GeV, and -t'<0.4 GeV$^2$. Using an unbinned maximum-likelihood method, 25 parameters are extracted. These determine the real and imaginary parts of the ratios of several helicity amplitudes describing $\rho^0$-meson production by a virtual photon. The denominator of those ratios is the dominant amplitude, the nucleon-helicity-non-flip amplitude $F_{0\frac{1}{2}0\frac{1}{2}}$, which describes the production of a longitudinal $\rho^{0}$-meson by a longitudinal virtual photon. The ratios of nucleon-helicity-non-flip amplitudes are found to be in good agreement with those from the previous HERMES analysis. The transverse target polarization allows for the first time the extraction of ratios of a number of nucleon-helicity-flip amplitudes to $F_{0\frac{1}{2}0\frac{1}{2}}$. Results obtained in a handbag approach based on generalized parton distributions taking into account the contribution from pion exchange are found to be in good agreement with these ratios. Within the model, the data favor a positive sign for the $\pi-\rho$ transition form factor. By also exploiting the longitudinal beam polarization, a total of 71 $\rho^0$ spin-density matrix elements is determined from the extracted 25 parameters, in contrast to only 53 elements as directly determined in earlier analyses.
High rate, fast timing Glass RPC for the high {\eta} CMS muon detectors (1606.01398)
F. Lagarde, M. Gouzevitch, I. Laktineh, V. Buridon, X. Chen, C. Combaret, A. Eynard, L. Germani, G. Grenier, H. Mathez, L. Mirabito, A. Petrukhin, A. Steen, W. Tromeuraa, Y. Wang, A. Gongab, N. Moreau, C. de la Taille, F. Dulucqac, A. Cimmino, S. Crucy, A.Fagot, M. Gul, A.A.O. Rios, M. Tytgat, N. Zaganidisb, S. Aly, Y. Assran, A. Radi, A. Sayedc, G. Singhd, M. Abbrescia, G. Iaselli, M. Maggi, G. Pugliese, P. Verwilligene, W. Van Doninck, S. Colafranceschi, A. Sharmag, L. Benussi, S. Bianco, D.Piccolo, F. Primaverah, V. Bhatnagar, R. Kumari, A. Mehta, J. Singhi, A. Ahmad, W. Ahmed, H. M. I. Asghar, I. M. Awan, R. Hoorani, S. Muhammad, H. Shahzad, M.A. Shah, S. W. Cho, S. Y. Choi, B. Hong, M. H. Kang, K. S. Lee, J. H. Lim, S. K. Parkk, M.S. Kiml, S. Carpinteyro Bernardino, I. Pedraza, C. Uribe Estradam, S. Carrillo Moreno, F. Vazquez Valencian, L.M. Panto, S. Buontempo, N. Cavallo, M. Esposito, F. Fabozzi, G. Lanza, I. Orso, L. Lista, S. Meola, M. Merola, P. Paolucci, F. Thyssen, A. Braghieri, A. Magnani, P. Montagna, C. Riccardi, P. Salvini, I. Vai, P. Vituloq, Y. Ban, S.J. Qianr, M. Choi, Y. Choi, J. Goh, D. Kimt, A. Aleksandrov, R. Hadjiiska, P. Iaydjiev, M. Rodozov, S. Stoykova, G. Sultanov, M. Vutovau, A. Dimitrov, L. Litov, B. Pavlov, P. Petkovv, I. Bagaturia, D. Lomidzew, C. Avila, A. Cabrera, J.C. Sanabria, I. Crottyy, J. Vaitkusz
July 22, 2016 hep-ex, physics.ins-det
The HL-LHC phase is designed to increase by an order of magnitude the amount of data to be collected by the LHC experiments. To achieve this goal in a reasonable time scale the instantaneous luminosity would also increase by an order of magnitude up to $6.10^{34} cm^{-2} s^{-1}$ . The region of the forward muon spectrometer ($|{\eta}| > 1.6$) is not equipped with RPC stations. The increase of the expected particles rate up to $2 kHz/cm^{2}$ (including a safety factor 3) motivates the installation of RPC chambers to guarantee redundancy with the CSC chambers already present. The actual RPC technology of CMS cannot sustain the expected background level. The new technology that will be chosen should have a high rate capability and provides a good spatial and timing resolution. A new generation of Glass-RPC (GRPC) using low-resistivity (LR) glass is proposed to equip at least the two most far away of the four high ${\eta}$ muon stations of CMS. First the design of small size prototypes and studies of their performance in high-rate particles flux is presented. Then the proposed designs for large size chambers and their fast-timing electronic readout are examined and preliminary results are provided.
R&D towards the CMS RPC Phase-2 upgrade (1606.04291)
A. Fagot, A. Cimmino, S. Crucy, M. Gul, A.A.O. Rios, M. Tytgat, N. Zaganidis, S. Aly, Y. Assran, A. Radi, A. Sayed, G. Singh, M. Abbrescia, G. Iaselli, M. Maggi, G. Pugliese, P. Verwilligen, W. Van Doninck, S. Colafranceschi, A. Sharma, L. Benussi, S. Bianco, D.Piccolo, F. Primavera, V. Bhatnagar, R. Kumari, A. Mehta, J. Singh, A. Ahmad, W. Ahmed, M. I. Asghar, I. M. Awan, H. R. Hoorani, S. Muhammad, M.A. Shah, H. Shahzad, S.W. Cho, S.Y. Choi, B. Hong, M.H. Kang, K.S. Lee, J.H. Lim, S.K. Park, M.S. Kim, M. Gouzevitch, G. Grenier, F. Lagarde, I.B. Laktineh, S. Carpinteyro Bernardino, C. Uribe Estrada, I. Pedraza, S. Carrillo Moreno, F. Vazquez Valencia, L.M. Pant, S. Buontempo, N. Cavallo, M. Esposito, F. Fabozzi, G. Lanza, I. Orso, L. Lista, S. Meola, M. Merola, P. Paolucci, F. Thyssen, A. Braghieri, A. Magnani, P. Montagna, C. Riccardi, P. Salvini, I. Vai, P. Vitulo, Y. Ban, S.J. Qian, M. Choi, Y. Choi, J. Goh, D. Kim, A. Aleksandrov, R. Hadjiiska, P. Iaydjiev, M. Rodozov, S. Stoykova, G. Sultanov, M. Vutova, A. Dimitrov, L. Litov, B. Pavlov, P. Petkov, I. Bagaturia, D. Lomidze, C. Avila, A. Cabrera, J.C. Sanabria, I. Crotty, J. Vaitkus
June 14, 2016 hep-ex, physics.ins-det
The high pseudo-rapidity region of the CMS muon system is covered by Cathode Strip Chambers (CSC) only and lacks redundant coverage despite the fact that it is a challenging region for muons in terms of backgrounds and momentum resolution. In order to maintain good efficiency for the muon trigger in this region additional RPCs are planned to be installed in the two outermost stations at low angle named RE3/1 and RE4/1. These stations will use RPCs with finer granularity and good timing resolution to mitigate background effects and to increase the redundancy of the system.
Preliminary results of Resistive Plate Chambers operated with eco-friendly gas mixtures for application in the CMS experiment (1605.08172)
M. Abbrescia, P. Van Auwegem, L. Benussi, S. Bianco, S. Cauwenbergh, M. Ferrini, S. Muhammad, L. Passamonti, D. Pierluigi, D. Piccolo, F. Primavera, A. Russo, G. Saviano, M. Tytgat
May 26, 2016 hep-ex, physics.ins-det
The operations of Resistive Plate Chambers in LHC experiments require Fluorine based (F-based) gases for optimal performance. Recent European regulations demand the use of environmentally unfriendly F-based gases to be limited or banned. In view of the CMS experiment upgrade, several tests are ongoing to measure the performance of the detector with these new ecological gas mixtures, in terms of efficiency, streamer probability, induced charge and time resolution. Prototype chambers with readout pads and with the standard CMS electronic setup are under test. In this paper preliminary results on performance of RPCs operated with a potential eco-friendly gas candidate 1,3,3,3-Tetrafluoropropene, commercially known as HFO-1234ze, with CO2 and CF3I based gas mixtures are presented and discussed for the possible application in the CMS experiment.
Performance of Resistive Plate Chambers installed during the first long shutdown of the CMS experiment (1605.06798)
M. Shopova, A. Aleksandrov, R. Hadjiiska, P. Iaydjiev, G. Sultanov, M. Rodozov, S. Stoykova, Y. Assran, A. Sayed, A. Radi, S. Aly, G. Singh, M. Abbrescia, G. Iaselli, M. Maggi, G. Pugliese, P. Verwilligen, W. Van Doninck, S. Colafranceschi, A. Sharma, L. Benussi, S. Bianco, D. Piccolo, F. Primavera, A. Cimmino, S. Crucy, A. A. O. Rios, M. Tytgat, N. Zaganidis, M. Gul, A. Fagot, V. Bhatnagar, J. Singh, R. Kumari, A. Mehta, A. Ahmad, I. M. Awan, H. Shahzad, H. Hoorani, M. I. Asghar, S. Muhammad, W. Ahmed, M. A. Shah, S. W. Cho, S. Y. Choi, B. Hong, M. H. Kang, K. S. Lee, J. H. Lim, S. K. Park, M. S. Kim, I. B. Laktineh, F. Lagarde, M. Gouzevitch, G. Grenier, I. Pedraza, S. Carpinteyro Bernardino, C. Uribe Estrada, S. Carrillo Moreno, F. Vazquez Valencia, L. M. Pant, S. Buontempo, N. Cavallo, F. Fabozzi, I. Orso, L. Lista, S. Meola, M. Merola, P. Paolucci, F. Thyssen, G. Lanza, M. Esposito, A. Braghieri, A. Magnani, C. Riccardi, P. Salvini, I. Vai, P. Vitulo, P. Montagna, Y. Ban, S. J. Qian, M. Choi, Y. Choi, J. Goh, D. Kim, A. Dimitrov, L. Litov, P. Petkov, B. Pavlov, I. Bagaturia, D. Lomidze, C. Avila, A. Cabrera, J. C. Sanabria, I. Crotty, J. Vaitkus
The CMS experiment, located at the CERN Large Hadron Collider, has a redundant muon system composed by three different detector technologies: Cathode Strip Chambers (in the forward regions), Drift Tubes (in the central region) and Resistive Plate Chambers (both its central and forward regions). All three are used for muon reconstruction and triggering. During the first long shutdown (LS1) of the LHC (2013-2014) the CMS muon system has been upgraded with 144 newly installed RPCs on the forth forward stations. The new chambers ensure and enhance the muon trigger efficiency in the high luminosity conditions of the LHC Run2. The chambers have been successfully installed and commissioned. The system has been run successfully and experimental data has been collected and analyzed. The performance results of the newly installed RPCs will be presented.
Radiation Tests of Real-Sized Prototype RPCs for the Future CMS RPC Upscope (1605.00440)
K. S. Lee, S. Choi, B. S. Hong, M. Jo, J. W. Kang, M. Kang, H. Kim, K. Lee, S. K. Parka, A. Cimmino, S. Crucy, A. Fagot, M. Gul, A. A. O. Rios, M. Tytgat, N. Zaganidis, S. Ali, Y. Assran, A. Radi, A. Sayed, G. Singh, M. Abbrescia, G. Iaselli, M. Maggi, G. Pugliese, P. Verwilligen, W. van Doninck, S. Colafranceschi, A. Sharma, L. Benussi, S. Bianco, D. Piccolo, F. Primavera, V. Bhatnagar, R. Kumar, A. Metha, J. Singhi, A. Ahmad, M. Ahmad, Q. Hassan, H. R. Hoorani, W. A. Khan, T. Khurshid, D. H. Kim, S. K. Nam, M. Goutzvitz, G. Grenier, F. Lagarde, I. B. Laktineh, S. Carpinteyro Bernardino, C. Uribe Estrada, I. Pedrazan, S. Carrillo Moreno, F. Vazquez Valenciao, L. M. Pantp, S. Buontempo, N. Cavallo, M. Esposito, F. Fabozzi, G. Lanza, L. Lista, S. Meola, M. Merola, I. Orso, P. Paolucci, F. Thyssenq, A. Braghieri, A. Magnani, P. Montagna, C. Riccardi, P. Salvini, I. Vai, P. Vitulo, Y. Ban, S. J. Qian, M. Choit, Y. Choi, J. Goh, D. Kim, A. Aleksandrov, R. Hadjiiska, P. Iaydjiev, M. Rodozov, S. Stoykova, G. Sultanov, M. Vutova, A. Dimitrov, L. Litov, B. Pavlov, P. Petkov, D. Lomidze, C. Avila, A. Cabrera, J. C. Sanabria, I. Crotty, J. Vaitkus
May 4, 2016 hep-ex, physics.ins-det
We report on a systematic study of double-gap and four-gap phenolic resistive plate chambers (RPCs) for future high-{\eta} RPC triggers in the CMS. In the present study, we constructed real-sized double-gap and four-gap RPCs with gap thicknesses of 1.6 and 0.8 mm, respectively, with 2-mm-thick phenolic high-pressure-laminated (HPL) plates. We examined the prototype RPCs for cosmic rays and 100 GeV muons provided by the SPS H4 beam line at CERN. We applied maximum gamma rates of 1.5 kHz cm-2 provided by 137Cs sources at Korea University and the GIF++ irradiation facility installed at the SPS H4 beam line to examine the rate capabilities of the prototype RPCs. In contrast to the case of the four-gap RPCs, we found the relatively high threshold was conducive to effectively suppressing the rapid increase of strip cluster sizes of muon hits with high voltage, especially when measuring the narrow-pitch strips. The gamma-induced currents drawn in the four-gap RPC were about one-fourth of those drawn in the double-gap RPC. The rate capabilities of both RPC types, proven through the present testing using gamma-ray sources, far exceeded the maximum rate expected in the new high-{\eta} endcap RPCs planned for future phase-II LHC runs.
First results of the CALICE SDHCAL technological prototype (1602.02276)
V. Buridon, C. Combaret, L. Caponetto, R. Eté, G. Garillot, G. Grenier, R. Han, J.C. Ianigro, R. Kieffer, I. Laktineh (Corresponding author), N. Lumb, H. Mathez, L. Mirabito, A. Petrukhin, A. Steen, J. Berenguer Antequera, E. Calvo Alamillo, M.-C. Fouz, J. Marin, J. Puerta-Pelayo, A. Verdugo, E. Cortina Gil, S. Mannai, S. Cauwenbergh, M. Tytgat, A. Pingault, N. Zaganidis, M. Anduze, V. Balagura, K. Belkadhi, V. Boudry, J-C. Brient, R. Cornat, M. Frotin, F. Gastaldi, Y. Haddad, M. Ruan, K. Shpak, H. Videau, D. Yu, S. Callier, S. Conforti di Lorenzo, F. Dulucq, G. Martin-Chassard, Ch. de la Taille, L. Raux, N. Seguin-Moreau, D. Boumediene, C. Carloganu, V. Français, J. Bonis, B. Bouquet, P. Cornebise, Ph. Doublet, M. Faucci-Giannelli, T. Frisson, G. Guilhem, H. Li, F. Richard, R. Pöschl, J. Rouëné, F. Wicek, Z. Zhang, Z. Deng, Y. Li, Y. Wang, Q. Yue, Z. Yang, G. Cho, D-W. Kim, S. C. Lee, W. Park, S. Vallecorsa, E. Brianne, A. Ebrahimi, K. Gadow, P. Göttlicher, C. Günter, O. Hartbrich, B. Hermberg, A. Irles, F. Krivan, K. Krüger, J. Kvasnicka, S. Lu, B. Lutz, V. Morgunov, C. Neubüser A. Provenza, M. Reinecke, F. Sefkow, S. Schuwalow, H.L. Tran, E. Garutti, S. Laurien, M. Matysek, M. Ramilli, S. Schroeder, B. Bilki, E. Norbeck, D. Northacker, Y. Onel, N. Kirikova, V. Kozlov, P. Smirnov, Y. Soloviev, M. Chadeeva, M. Danilov, M. Gabriel, P. Goecke, C. Kiesling, N. van der Kolk, F. Simon, C. Soldner, M. Szalay, L. Weuste, D. Jeans, S. Komamiya, H. Nakanishi, D. Benchekroun, A. Hoummada, Y. Khoulaki
March 20, 2016 hep-ex, physics.ins-det
The CALICE Semi-Digital Hadronic Calorimeter (SDHCAL) prototype, built in 2011, was exposed to beams of hadrons, electrons and muons in two short periods in 2012 on two different beam lines of the CERN SPS. The prototype with its 48 active layers, made of Glass Resistive Plate Chambers and their embedded readout electronics, was run in triggerless and power-pulsing mode. The performance of the SDHCAL during the test beam was found to be very satisfactory with an efficiency exceeding 90% for almost all of the 48 active layers. A linear response (within 5%) and a good energy resolution are obtained for a large range of hadronic energies (5-80GeV) by applying appropriate calibration coefficients to the collected data for both the Digital (Binary) and the Semi-Digital (Multi-threshold) modes of the SDHCAL prototype. The Semi-Digital mode shows better performance at energies exceeding 30GeV
Spin density matrix elements in exclusive $\omega$ electroproduction on $^1$H and $^2$H targets at 27.5 GeV beam energy (1407.2119)
The HERMES Collaboration: A. Airapetian, N. Akopov, Z. Akopov, W. Augustyniak, A. Avetissian, H.P. Blok, A. Borissov, V. Bryzgalov, M. Capiluppi, G.P. Capitani, E. Cisbani, G. Ciullo, M. Contalbrigo, P.F. Dalpiaz, W. Deconinck, R. De Leo, E. De Sanctis, M. Diefenthaler, P. Di Nezza, M. Düren, M. Ehrenfried, G. Elbakian, F. Ellinghaus, E. Etzelmüller, R. Fabbri, L. Felawka, S. Frullani, D. Gabbert, G. Gapienko, V. Gapienko, F. Garibaldi, G. Gavrilov, V. Gharibyan, M. Hartig, D. Hasch, Y. Holler, I. Hristova, A. Ivanilov, H.E. Jackson, S. Joosten, R. Kaiser, G. Karyan, T. Keri, E. Kinney, A. Kisselev, V. Korotkov, V. Kozlov, P. Kravchenko, V.G. Krivokhijine, L. Lagamba, L. Lapikás, I. Lehmann, P. Lenisa, W. Lorenzon, B.-Q. Ma, D. Mahon, S.I. Manaenkov, Y. Mao, B. Marianski, H. Marukyan, A. Movsisyan, M. Murray, Y. Naryshkin, A. Nass, W.-D. Nowak, L.L. Pappalardo, R. Perez-Benito, A. Petrosyan, P.E. Reimer, A.R. Reolon, C. Riedl, K. Rith, A. Rostomyan, D. Ryckbosch, A. Schäfer, G. Schnell, K.P. Schüler, B. Seitz, T.-A. Shibata, M. Stahl, M. Stancari, M. Statera, E. Steffens, J.J.M. Steijger, S. Taroian, A. Terkulov, R. Truty, A. Trzcinski, M. Tytgat, Y. Van Haarlem, C. Van Hulse, V. Vikhrov, I. Vilardi, S. Wang, S. Yaschenko, S. Yen, D. Zeiler, B. Zihlmann, P. Zupranski
March 1, 2016 hep-ph, hep-ex
Exclusive electroproduction of $\omega$ mesons on unpolarized hydrogen and deuterium targets is studied in the kinematic region of Q$^2$>1.0 GeV$^2$, 3.0 GeV < W < 6.3 GeV, and -t'< 0.2 GeV$^2$. Results on the angular distribution of the $\omega$ meson, including its decay products, are presented. The data were accumulated with the HERMES forward spectrometer during the 1996-2007 running period using the 27.6 GeV longitudinally polarized electron or positron beam of HERA. The determination of the virtual-photon longitudinal-to-transverse cross-section ratio reveals that a considerable part of the cross section arises from transversely polarized photons. Spin density matrix elements are presented in projections of Q$^2$ or -t'. Violation of s-channel helicity conservation is observed for some of these elements. A sizable contribution from unnatural-parity-exchange amplitudes is found and the phase shift between those amplitudes that describe transverse $\omega$ production by longitudinal and transverse virtual photons, $\gamma^{*}_{L} \to \omega_{T}$ and $\gamma^{*}_{T} \to \omega_{T}$, is determined for the first time. A hierarchy of helicity amplitudes is established, which mainly means that the unnatural-parity-exchange amplitude describing the $\gamma^*_T \to \omega_T$ transition dominates over the two natural-parity-exchange amplitudes describing the $\gamma^*_L \to \omega_L$ and $\gamma^*_T \to \omega_T$ transitions, with the latter two being of similar magnitude. Good agreement is found between the HERMES proton data and results of a pQCD-inspired phenomenological model that includes pion-pole contributions, which are of unnatural parity.
Fiber Bragg Grating (FBG) sensors as flatness and mechanical stretching sensors (1512.08481)
D. Abbaneo, M. Abbas, M. Abbrescia, A.A. Abdelalim, M. Abi Akl, O. Aboamer, D. Acosta, A. Ahmad, W. Ahmed, W. Ahmed, A. Aleksandrov, R. Aly, P. Altieri, C. Asawatangtrakuldee, P. Aspell, Y. Assran, I. Awan, S. Bally, Y. Ban, S. Banerjee, V. Barashko, P. Barria, G. Bencze, N. Beni, L. Benussi, V. Bhopatkar, S. Bianco, J. Bos, O. Bouhali, A. Braghieri, S. Braibant, S. Buontempo, C. Calabria, M. Caponero, C. Caputo, F. Cassese, A. Castaneda, S. Cauwenbergh, F.R. Cavallo, A. Celik, M. Choi, S. Choi, J. Christiansen, A. Cimmino, S. Colafranceschi, A. Colaleo, A. Conde Garcia, S. Czellar, M.M. Dabrowski, G. De Lentdecker, R. De Oliveira, G. de Robertis, S. Dildick, B. Dorney, W. Elmetenawee, G. Endroczi, F. Errico, A. Fenyvesi, S. Ferry, I. Furic, P. Giacomelli, V. Golovtsov, L. Guiducci, F. Guilloux, A. Gutierrez, R.M. Hadjiiska, A. Hassan, J. Hauser, K. Hoepfner, M. Hohlmann, H. Hoorani, P. Iaydjiev, Y.G. Jeng, T. Kamon, P. Karchin, A. Korytov, S. Krutelyov, A. Kumar, H. Kim, J. Lee, T. Lenzi, L. Litov, F. Loddo, A. Madorsky, T. Maerschalk, M. Maggi, A. Magnani, P.K. Mal, K. Mandal, A. Marchioro, A. Marinov, R. Masod, N. Majumdar, J.A. Merlin, G. Mitselmakher, A.K. Mohanty, S. Muhammad, A. Mohapatra, J. Molnar, S. Mukhopadhyay, M. Naimuddin, S. Nuzzo, E. Oliveri, L.M. Pant, P. Paolucci, I. Park, G. Passeggio, L. Passamonti, B. Pavlov, B. Philipps, D. Piccolo, D. Pierluigi, H. Postema, A. Puig Baranac, A. Radi, R. Radogna, G. Raffone, A. Ranieri, G. Rashevski, C. Riccardi, M. Rodozov, A. Rodrigues, L. Ropelewski, S. RoyChowdhury, A. Russo, G. Ryu, M.S. Ryu, A. Safonov, S. Salva, G. Saviano, A. Sharma, A. Sharma, R. Sharma, A.H. Shah, M. Shopova, J. Sturdy, G. Sultanov, S.K. Swain, Z. Szillasi, A. Tatarinov, T. Tuuva, M. Tytgat, I. Vai, M. Van Stenis, R. Venditti, E. Verhagen, P. Verwilligen, P. Vitulo, S. Volkov, A. Vorobyev, D. Wang, M. Wang, U. Yang, Y. Yang, R. Yonamine, N. Zaganidis, F. Zenoni, A. Zhang
Dec. 28, 2015 physics.ins-det
A novel approach which uses Fibre Bragg Grating (FBG) sensors has been utilised to assess and monitor the flatness of Gaseous Electron Multipliers (GEM) foils. The setup layout and preliminary results are presented.
A novel application of Fiber Bragg Grating (FBG) sensors in MPGD (1512.08529)
We present a novel application of Fiber Bragg Grating (FBG) sensors in the construction and characterisation of Micro Pattern Gaseous Detector (MPGD), with particular attention to the realisation of the largest triple (Gas electron Multiplier) GEM chambers so far operated, the GE1/1 chambers of the CMS experiment at LHC. The GE1/1 CMS project consists of 144 GEM chambers of about 0.5 m2 active area each, employing three GEM foils per chamber, to be installed in the forward region of the CMS endcap during the long shutdown of LHC in 2108-2019. The large active area of each GE1/1 chamber consists of GEM foils that are mechanically stretched in order to secure their flatness and the consequent uniform performance of the GE1/1 chamber across its whole active surface. So far FBGs have been used in high energy physics mainly as high precision positioning and re-positioning sensors and as low cost, easy to mount, low space consuming temperature sensors. FBGs are also commonly used for very precise strain measurements in material studies. In this work we present a novel use of FBGs as flatness and mechanical tensioning sensors applied to the wide GEM foils of the GE1/1 chambers. A network of FBG sensors have been used to determine the optimal mechanical tension applied and to characterise the mechanical tension that should be applied to the foils. We discuss the results of the test done on a full-sized GE1/1 final prototype, the studies done to fully characterise the GEM material, how this information was used to define a standard assembly procedure and possible future developments.
Transverse-target-spin asymmetry in exclusive $\omega$-meson electroproduction (1508.07612)
The HERMES Collaboration: A. Airapetian, N. Akopov, Z. Akopov, E.C. Aschenauer, W. Augustyniak, A. Avetissian, S. Belostotski, H.P. Blok, A. Borissov, V. Bryzgalov, G.P. Capitani, G. Ciullo, M. Contalbrigo, P.F. Dalpiaz, W. Deconinck, R. De Leo, E. De Sanctis, M. Diefenthaler, P. Di Nezza, M. Düren, G. Elbakian, F. Ellinghaus, L. Felawka, S. Frullani, D. Gabbert, G. Gapienko, V. Gapienko, V. Gharibyan, F. Giordano, S. Gliske, D. Hasch, M. Hoek, Y. Holler, A. Ivanilov, H.E. Jackson, S. Joosten, R. Kaiser, G. Karyan, T. Keri, E. Kinney, A. Kisselev, V. Korotkov, V. Kozlov, V.G. Krivokhijine, L. Lagamba, L. Lapikás, I. Lehmann, P. Lenisa, W. Lorenzon, B.-Q. Ma, S.I. Manaenkov, Y. Mao, B. Marianski, H. Marukyan, Y. Miyachi, A. Movsisyan, V. Muccifora, Y. Naryshkin, A. Nass, M. Negodaev, W.-D. Nowak, L.L. Pappalardo, R. Perez-Benito, A. Petrosyan, P.E. Reimer, A.R. Reolon, C. Riedl, K. Rith, G. Rosner, A. Rostomyan, J. Rubin, D. Ryckbosch, Y. Salomatin, G. Schnell, B. Seitz, T.-A. Shibata, M. Statera, E. Steffens, J.J.M. Steijger, F. Stinzing, S. Taroian, A. Terkulov, R. Truty, A. Trzcinski, M. Tytgat, Y. Van Haarlem, C. Van Hulse, V. Vikhrov, I. Vilardi, C. Vogel, S. Wang, S. Yaschenko, S. Yen, B. Zihlmann, P. Zupranski
Dec. 15, 2015 hep-ph, hep-ex
Hard exclusive electroproduction of $\omega$ mesons is studied with the HERMES spectrometer at the DESY laboratory by scattering 27.6 GeV positron and electron beams off a transversely polarized hydrogen target. The amplitudes of five azimuthal modulations of the single-spin asymmetry of the cross section with respect to the transverse proton polarization are measured. They are determined in the entire kinematic region as well as for two bins in photon virtuality and momentum transfer to the nucleon. Also, a separation of asymmetry amplitudes into longitudinal and transverse components is done. These results are compared to a phenomenological model that includes the pion pole contribution. Within this model, the data favor a positive $\pi\omega$ transition form factor.
Construction and commissioning of a technological prototype of a high-granularity semi-digital hadronic calorimeter (1506.05316)
G. Baulieu, M. Bedjidian, K. Belkadhi, J. Berenguer, V. Boudry, P. Calabria, S. Callier, E. Calvo Almillo, S. Cap, L. Caponetto, C. Combaret, R. Cornat, E. Cortina Gil, B. de Callatay, F. Davin, C. de la Taille, R. Dellanegra, D. Delaunay, F. Doizon, F. Dulucq, A. Eynard, M-C. Fouz, F. Gastaldi, L. Germani, G. Grenier, Y. Haddad, R. Han, J-C. Ianigro, R. Kieffer, I. Laktineh, N. Lumb, K. Manai, S. Mannai, H. Mathez, L. Mirabito, J. Prast, J. Puerta Pelayo, M. Ruan, F. Schirra, N. Seguin-Moreau, A. Steen, W. Tromeur, M. Tytgat, M. Vander Donckt, G. Vouters, N. Zaganidis
Oct. 24, 2015 hep-ex, physics.ins-det
A large prototype of 1.3m3 was designed and built as a demonstrator of the semi-digital hadronic calorimeter (SDHCAL) concept proposed for the future ILC experiments. The prototype is a sampling hadronic calorimeter of 48 units. Each unit is built of an active layer made of 1m2 Glass Resistive Plate Chamber(GRPC) detector placed inside a cassette whose walls are made of stainless steel. The cassette contains also the electronics used to read out the GRPC detector. The lateral granularity of the active layer is provided by the electronics pick-up pads of 1cm2 each. The cassettes are inserted into a self-supporting mechanical structure built also of stainless steel plates which, with the cassettes walls, play the role of the absorber. The prototype was designed to be very compact and important efforts were made to minimize the number of services cables to optimize the efficiency of the Particle Flow Algorithm techniques to be used in the future ILC experiments. The different components of the SDHCAL prototype were studied individually and strict criteria were applied for the final selection of these components. Basic calibration procedures were performed after the prototype assembling. The prototype is the first of a series of new-generation detectors equipped with a power-pulsing mode intended to reduce the power consumption of this highly granular detector. A dedicated acquisition system was developed to deal with the output of more than 440000 electronics channels in both trigger and triggerless modes. After its completion in 2011, the prototype was commissioned using cosmic rays and particles beams at CERN.
Observation of the rare $B^0_s\to\mu^+\mu^-$ decay from the combined analysis of CMS and LHCb data (1411.4413)
The CMS, LHCb Collaborations: V. Khachatryan, A.M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Erö, M. Friedl, R. Frühwirth, V.M. Ghete, C. Hartl, N. Hörmann, J. Hrubec, M. Jeitler, W. Kiesenhofer, V. Knünz, M. Krammer, I. Krätschmer, D. Liko, I. Mikulec, D. Rabady, B. Rahbaran, H. Rohringer, R. Schöfbeck, J. Strauss, W. Treberer-Treberspurg, W. Waltenberger, C.-E. Wulz, V. Mossolov, N. Shumeiko, J. Suarez Gonzalez, S. Alderweireldt, S. Bansal, T. Cornelis, E.A. De Wolf, X. Janssen, A. Knutsson, J. Lauwers, S. Luyckx, S. Ochesanu, R. Rougny, M. Van De Klundert, H. Van Haevermaet, P. Van Mechelen, N. Van Remortel, A. Van Spilbeeck, F. Blekman, S. Blyweert, J. D'Hondt, N. Daci, N. Heracleous, J. Keaveney, S. Lowette, M. Maes, A. Olbrechts, Q. Python, D. Strom, S. Tavernier, W. Van Doninck, P. Van Mulders, G.P. Van Onsem, I. Villella, C. Caillol, B. Clerbaux, G. De Lentdecker, D. Dobur, L. Favart, A.P.R. Gay, A. Grebenyuk, A. Léonard, A. Mohammadi, L. Perniè, A. Randle-conde, T. Reis, T. Seva, L. Thomas, C. Vander Velde, P. Vanlaer, J. Wang, F. Zenoni, V. Adler, K. Beernaert, L. Benucci, A. Cimmino, S. Costantini, S. Crucy, S. Dildick, A. Fagot, G. Garcia, J. Mccartin, A.A. Ocampo Rios, D. Ryckbosch, S. Salva Diblen, M. Sigamani, N. Strobbe, F. Thyssen, M. Tytgat, E. Yazgan, N. Zaganidis, S. Basegmez, C. Beluffi, G. Bruno, R. Castello, A. Caudron, L. Ceard, G.G. Da Silveira, C. Delaere, T. du Pree, D. Favart, L. Forthomme, A. Giammanco, J. Hollar, A. Jafari, P. Jez, M. Komm, V. Lemaitre, C. Nuttens, D. Pagano, L. Perrini, A. Pin, K. Piotrzkowski, A. Popov, L. Quertenmont, M. Selvaggi, M. Vidal Marono, J.M. Vizan Garcia, N. Beliy, T. Caebergs, E. Daubie, G.H. Hammad, W.L. Aldá Júnior, G.A. Alves, L. Brito, M. Correa Martins Junior, T. Dos Reis Martins, C. Mora Herrera, M.E. Pol, P. Rebello Teles, W. Carvalho, J. Chinellato, A. Custódio, E.M. Da Costa, D. De Jesus Damiao, C. De Oliveira Martins, S. Fonseca De Souza, H. Malbouisson, D. Matos Figueiredo, L. Mundim, H. Nogima, W.L. Prado Da Silva, J. Santaolalla, A. Santoro, A. Sznajder, E.J. Tonelli Manganote, A. Vilela Pereira, C.A. Bernardes, S. Dogra, T.R. Fernandez Perez Tomei, E.M. Gregores, P.G. Mercadante, S.F. Novaes, Sandra S. Padula, A. Aleksandrov, V. Genchev, R. Hadjiiska, P. Iaydjiev, A. Marinov, S. Piperov, M. Rodozov, G. Sultanov, M. Vutova, A. Dimitrov, I. Glushkov, L. Litov, B. Pavlov, P. Petkov, J.G. Bian, G.M. Chen, H.S. Chen, M. Chen, T. Cheng, R. Du, C.H. Jiang, R. Plestina, F. Romeo, J. Tao, Z. Wang, C. Asawatangtrakuldee, Y. Ban, Q. Li, S. Liu, Y. Mao, S.J. Qian, D. Wang, Z. Xu, W. Zou, C. Avila, A. Cabrera, L.F. Chaparro Sierra, C. Florez, J.P. Gomez, B. Gomez Moreno, J.C. Sanabria, N. Godinovic, D. Lelas, D. Polic, I. Puljak, Z. Antunovic, M. Kovac, V. Brigljevic, K. Kadija, J. Luetic, D. Mekterovic, L. Sudic, A. Attikis, G. Mavromanolakis, J. Mousa, C. Nicolaou, F. Ptochos, P.A. Razis, M. Bodlak, M. Finger, M. Finger Jr., Y. Assran, A. Ellithi Kamel, M.A. Mahmoud, A. Radi, M. Kadastik, M. Murumaa, M. Raidal, A. Tiko, P. Eerola, G. Fedi, M. Voutilainen, J. Härkönen, V. Karimäki, R. Kinnunen, M.J. Kortelainen, T. Lampén, K. Lassila-Perini, S. Lehti, T. Lindén, P. Luukka, T. Mäenpää, T. Peltola, E. Tuominen, J. Tuominiemi, E. Tuovinen, L. Wendland, J. Talvitie, T. Tuuva, M. Besancon, F. Couderc, M. Dejardin, D. Denegri, B. Fabbro, J.L. Faure, C. Favaro, F. Ferri, S. Ganjour, A. Givernaud, P. Gras, G. Hamel de Monchenault, P. Jarry, E. Locci, J. Malcles, J. Rander, A. Rosowsky, M. Titov, S. Baffioni, F. Beaudette, P. Busson, C. Charlot, T. Dahms, M. Dalchenko, L. Dobrzynski, N. Filipovic, A. Florent, R. Granier de Cassagnac, L. Mastrolorenzo, P. Miné, C. Mironov, I.N. Naranjo, M. Nguyen, C. Ochando, G. Ortona, P. Paganini, S. Regnard, R. Salerno, J.B. Sauvan, Y. Sirois, C. Veelken, Y. Yilmaz, A. Zabi, J.-L. Agram, J. Andrea, A. Aubin, D. Bloch, J.-M. Brom, E.C. Chabert, C. Collard, E. Conte, J.-C. Fontaine, D. Gelé, U. Goerlach, C. Goetzmann, A.-C. Le Bihan, K. Skovpen, P. Van Hove, S. Gadrat, S. Beauceron, N. Beaupere, G. Boudoul, E. Bouvier, S. Brochet, C.A. Carrillo Montoya, J. Chasserat, R. Chierici, D. Contardo, P. Depasse, H. El Mamouni, J. Fan, J. Fay, S. Gascon, M. Gouzevitch, B. Ille, T. Kurca, M. Lethuillier, L. Mirabito, S. Perries, J.D. Ruiz Alvarez, D. Sabes, L. Sgandurra, V. Sordini, M. Vander Donckt, P. Verdier, S. Viret, H. Xiao, Z. Tsamalaidze, C. Autermann, S. Beranek, M. Bontenackels, M. Edelhoff, L. Feld, A. Heister, O. Hindrichs, K. Klein, A. Ostapchuk, F. Raupach, J. Sammet, S. Schael, J.F. Schulte, H. Weber, B. Wittmer, V. Zhukov, M. Ata, M. Brodski, E. Dietz-Laursonn, D. Duchardt, M. Erdmann, R. Fischer, A. Güth, T. Hebbeker, C. Heidemann, K. Hoepfner, D. Klingebiel, S. Knutzen, P. Kreuzer, M. Merschmeyer, A. Meyer, P. Millet, M. Olschewski, K. Padeken, P. Papacz, H. Reithler, S.A. Schmitz, L. Sonnenschein, D. Teyssier, S. Thüer, M. Weber, V. Cherepanov, Y. Erdogan, G. Flügge, H. Geenen, M. Geisler, W. Haj Ahmad, F. Hoehle, B. Kargoll, T. Kress, Y. Kuessel, A. Künsken, J. Lingemann, A. Nowack, I.M. Nugent, O. Pooth, A. Stahl, M. Aldaya Martin, I. Asin, N. Bartosik, J. Behr, U. Behrens, A.J. Bell, A. Bethani, K. Borras, A. Burgmeier, A. Cakir, L. Calligaris, A. Campbell, S. Choudhury, F. Costanza, C. Diez Pardos, G. Dolinska, S. Dooling, T. Dorland, G. Eckerlin, D. Eckstein, T. Eichhorn, G. Flucke, J. Garay Garcia, A. Geiser, P. Gunnellini, J. Hauk, M. Hempel, H. Jung, A. Kalogeropoulos, M. Kasemann, P. Katsas, J. Kieseler, C. Kleinwort, I. Korol, D. Krücker, W. Lange, J. Leonard, K. Lipka, A. Lobanov, W. Lohmann, B. Lutz, R. Mankel, I. Marfin, I.-A. Melzer-Pellmann, A.B. Meyer, G. Mittag, J. Mnich, A. Mussgiller, S. Naumann-Emme, A. Nayak, E. Ntomari, H. Perrey, D. Pitzl, R. Placakyte, A. Raspereza, P.M. Ribeiro Cipriano, B. Roland, E. Ron, M.Ö. Sahin, J. Salfeld-Nebgen, P. Saxena, T. Schoerner-Sadenius, M. Schröder, C. Seitz, S. Spannagel, A.D.R. Vargas Trevino, R. Walsh, C. Wissing, V. Blobel, M. Centis Vignali, A.R. Draeger, J. Erfle, E. Garutti, K. Goebel, M. Görner, J. Haller, M. Hoffmann, R.S. Höing, A. Junkes, H. Kirschenmann, R. Klanner, R. Kogler, J. Lange, T. Lapsien, T. Lenz, I. Marchesini, J. Ott, T. Peiffer, A. Perieanu, N. Pietsch, J. Poehlsen, T. Poehlsen, D. Rathjens, C. Sander, H. Schettler, P. Schleper, E. Schlieckau, A. Schmidt, M. Seidel, V. Sola, H. Stadie, G. Steinbrück, D. Troendle, E. Usai, L. Vanelderen, A. Vanhoefer, C. Barth, C. Baus, J. Berger, C. Böser, E. Butz, T. Chwalek, W. De Boer, A. Descroix, A. Dierlamm, M. Feindt, F. Frensch, M. Giffels, A. Gilbert, F. Hartmann, T. Hauth, U. Husemann, I. Katkov, A. Kornmayer, E. Kuznetsova, P. Lobelle Pardo, M.U. Mozer, T. Müller, Th. Müller, A. Nürnberg, G. Quast, K. Rabbertz, S. Röcker, H.J. Simonis, F.M. Stober, R. Ulrich, J. Wagner-Kuhr, S. Wayand, T. Weiler, R. Wolf, G. Anagnostou, G. Daskalakis, T. Geralis, V.A. Giakoumopoulou, A. Kyriakis, D. Loukas, A. Markou, C. Markou, A. Psallidas, I. Topsis-Giotis, A. Agapitos, S. Kesisoglou, A. Panagiotou, N. Saoulidou, E. Stiliaris, X. Aslanoglou, I. Evangelou, G. Flouris, C. Foudas, P. Kokkas, N. Manthos, I. Papadopoulos, E. Paradas, J. Strologas, G. Bencze, C. Hajdu, P. Hidas, D. Horvath, F. Sikler, V. Veszpremi, G. Vesztergombi, A.J. Zsigmond, N. Beni, S. Czellar, J. Karancsi, J. Molnar, J. Palinkas, Z. Szillasi, A. Makovec, P. Raics, Z.L. Trocsanyi, B. Ujvari, N. Sahoo, S.K. Swain, S.B. Beri, V. Bhatnagar, R. Gupta, U.Bhawandeep, A.K. Kalsi, M. Kaur, R. Kumar, M. Mittal, N. Nishu, J.B. Singh, Ashok Kumar, Arun Kumar, S. Ahuja, A. Bhardwaj, B.C. Choudhary, A. Kumar, S. Malhotra, M. Naimuddin, K. Ranjan, V. Sharma, S. Banerjee, S. Bhattacharya, K. Chatterjee, S. Dutta, B. Gomber, Sa. Jain, Sh. Jain, R. Khurana, A. Modak, S. Mukherjee, D. Roy, S. Sarkar, M. Sharan, A. Abdulsalam, D. Dutta, S. Kailas, V. Kumar, A.K. Mohanty, L.M. Pant, P. Shukla, A. Topkar, T. Aziz, S. Banerjee, S. Bhowmik, R.M. Chatterjee, R.K. Dewanjee, S. Dugad, S. Ganguly, S. Ghosh, M. Guchait, A. Gurtu, G. Kole, S. Kumar, M. Maity, G. Majumder, K. Mazumdar, G.B. Mohanty, B. Parida, K. Sudhakar, N. Wickramage, H. Bakhshiansohi, H. Behnamian, S.M. Etesami, A. Fahim, R. Goldouzian, M. Khakzad, M. Mohammadi Najafabadi, M. Naseri, S. Paktinat Mehdiabadi, F. Rezaei Hosseinabadi, B. Safarzadeh, M. Zeinali, M. Felcini, M. Grunewald, M. Abbrescia, C. Calabria, S.S. Chhibra, A. Colaleo, D. Creanza, N. De Filippis, M. De Palma, L. Fiore, G. Iaselli, G. Maggi, M. Maggi, S. My, S. Nuzzo, A. Pompili, G. Pugliese, R. Radogna, G. Selvaggi, A. Sharma, L. Silvestris, R. Venditti, P. Verwilligen, G. Abbiendi, A.C. Benvenuti, D. Bonacorsi, S. Braibant-Giacomelli, L. Brigliadori, R. Campanini, P. Capiluppi, A. Castro, F.R. Cavallo, G. Codispoti, M. Cuffiani, G.M. Dallavalle, F. Fabbri, A. Fanfani, D. Fasanella, P. Giacomelli, C. Grandi, L. Guiducci, S. Marcellini, G. Masetti, A. Montanari, F.L. Navarria, A. Perrotta, F. Primavera, A.M. Rossi, T. Rovelli, G.P. Siroli, N. Tosi, R. Travaglini, S. Albergo, G. Cappello, M. Chiorboli, S. Costa, F. Giordano, R. Potenza, A. Tricomi, C. Tuve, G. Barbagli, V. Ciulli, C. Civinini, R. D'Alessandro, E. Focardi, E. Gallo, S. Gonzi, V. Gori, P. Lenzi, M. Meschini, S. Paoletti, G. Sguazzoni, A. Tropiano, L. Benussi, S. Bianco, F. Fabbri, D. Piccolo, R. Ferretti, F. Ferro, M. Lo Vetere, E. Robutti, S. Tosi, M.E. Dinardo, S. Fiorendi, S. Gennai, R. Gerosa, A. Ghezzi, P. Govoni, M.T. Lucchini, S. Malvezzi, R.A. Manzoni, A. Martelli, B. Marzocchi, D. Menasce, L. Moroni, M. Paganoni, D. Pedrini, S. Ragazzi, N. Redaelli, T. Tabarelli de Fatis, S. Buontempo, N. Cavallo, S. Di Guida, F. Fabozzi, A.O.M. Iorio, L. Lista, S. Meola, M. Merola, P. Paolucci, P. Azzi, N. Bacchetta, D. Bisello, A. Branca, R. Carlin, P. Checchia, M. Dall'Osso, T. Dorigo, U. Dosselli, M. Galanti, F. Gasparini, U. Gasparini, P. Giubilato, A. Gozzelino, K. Kanishchev, S. Lacaprara, M. Margoni, A.T. Meneguzzo, J. Pazzini, N. Pozzobon, P. Ronchese, F. Simonetto, E. Torassa, M. Tosi, P. Zotto, A. Zucchetta, G. Zumerle, M. Gabusi, S.P. Ratti, V. Re, C. Riccardi, P. Salvini, P. Vitulo, M. Biasini, G.M. Bilei, D. Ciangottini, L. Fanò, P. Lariccia, G. Mantovani, M. Menichelli, A. Saha, A. Santocchia, A. Spiezia, K. Androsov, P. Azzurri, G. Bagliesi, J. Bernardini, T. Boccali, G. Broccolo, R. Castaldi, M.A. Ciocci, R. Dell'Orso, S. Donato, F. Fiori, L. Foà, A. Giassi, M.T. Grippo, F. Ligabue, T. Lomtadze, L. Martini, A. Messineo, C.S. Moon, F. Palla, A. Rizzi, A. Savoy-Navarro, A.T. Serban, P. Spagnolo, P. Squillacioti, R. Tenchini, G. Tonelli, A. Venturi, P.G. Verdini, C. Vernieri, L. Barone, F. Cavallari, G. D'imperio, D. Del Re, M. Diemoz, C. Jorda, E. Longo, F. Margaroli, P. Meridiani, F. Micheli, S. Nourbakhsh, G. Organtini, R. Paramatti, S. Rahatlou, C. Rovelli, F. Santanastasio, L. Soffi, P. Traczyk, N. Amapane, R. Arcidiacono, S. Argiro, M. Arneodo, R. Bellan, C. 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Eitschberger, R. Ekelhof, L. Gavardi, F. Kruse, F. Meier, R. Niet, C.J. Parkinson, M. Schlupp, A. Shires, B. Spaan, S. Swientek, J. Wishahi, O. Aquines Gutierrez, J. Blouw, M. Britsch, M. Fontana, D. Popov, M. Schmelling, D. Volyanskyy, M. Zavertyaev, S. Bachmann, A. Bien, A. Comerma-Montells, M. De Cian, F. Dordei, S. Esen, C. Färber, E. Gersabeck, L. Grillo, X. Han, S. Hansmann-Menzemer, A. Jaeger, M. Kolpin, K. Kreplin, G. Krocker, B. Leverington, J. Marks, M. Meissner, M. Neuner, T. Nikodem, P. Seyfert, M. Stahl, S. Stahl, U. Uwer, M. Vesterinen, S. Wandernoth, D. Wiedner, A. Zhelezov, R. McNulty, R. Wallace, W.C. Zhang, A. Palano, A. Carbone, A. Falabella, D. Galli, U. Marconi, N. Moggi, M. Mussini, S. Perazzini, V. Vagnoni, G. Valenti, M. Zangoli, W. Bonivento, S. Cadeddu, A. Cardini, V. Cogoni, A. Contu, A. Lai, B. Liu, G. Manca, R. Oldeman, B. Saitta, C. Vacca, M. Andreotti, W. Baldini, C. Bozzi, R. Calabrese, M. Corvo, M. Fiore, M. Fiorini, E. Luppi, L.L. Pappalardo, I. Shapoval, G. Tellarini, L. Tomassetti, S. Vecchi, L. Anderlini, A. Bizzeti, M. Frosini, G. Graziani, G. Passaleva, M. Veltri, G. Bencivenni, P. Campana, P. De Simone, G. Lanfranchi, M. Palutan, M. Rama, A. Sarti, B. Sciascia, R. Vazquez Gomez, R. Cardinale, F. Fontanelli, S. Gambetta, C. Patrignani, A. Petrolini, A. Pistone, M. Calvi, L. Cassina, C. Gotti, B. Khanji, M. Kucharczyk, C. Matteuzzi, J. Fu, A. Geraci, N. Neri, F. Palombo, S. Amerio, G. Collazuol, S. Gallorini, A. Gianelle, D. Lucchesi, A. Lupato, M. Morandin, M. Rotondo, L. Sestini, G. Simi, R. Stroili, F. Bedeschi, R. Cenci, S. Leo, P. Marino, M.J. Morello, G. Punzi, S. Stracka, J. Walsh, G. Carboni, E. Furfaro, E. Santovetti, A. Satta, A.A. Alves Jr, G. Auriemma, V. Bocci, G. Martellotti, G. Penso, D. Pinci, R. Santacesaria, C. Satriano, A. Sciubba, A. Dziurda, W. Kucewicz, T. Lesiak, B. Rachwal, M. Witek, M. Firlej, T. Fiutowski, M. Idzik, P. Morawski, J. Moron, A. Oblakowska-Mucha, K. Swientek, T. Szumlak, V. Batozskaya, K. Klimaszewski, K. Kurek, M. Szczekowski, A. Ukleja, W. Wislicki, L. Cojocariu, L. Giubega, A. Grecu, F. Maciuc, M. Orlandea, B. Popovici, S. Stoica, M. Straticiuc, G. Alkhazov, N. Bondar, A. Dzyuba, O. Maev, N. Sagidova, Y. Shcheglov, A. Vorobyev, S. Belogurov, I. Belyaev, V. Egorychev, D. Golubkov, T. Kvaratskheliya, I.V. Machikhiliyan, I. Polyakov, D. Savrina, A. Semennikov, A. Zhokhov, A. Berezhnoy, M. Korolev, A. Leflat, N. Nikitin, S. Filippov, E. Gushchin, L. Kravchuk, A. Bondar, S. Eidelman, P. Krokovny, V. Kudryavtsev, L. Shekhtman, V. Vorobyev, A. Artamonov, K. Belous, R. Dzhelyadin, Yu. Guz, A. Novoselov, V. Obraztsov, A. Popov, V. Romanovsky, M. Shapkin, O. Stenyakin, O. Yushchenko, A. Badalov, M. Calvo Gomez, L. Garrido, D. Gascon, R. Graciani Diaz, E. Graugés, C. Marin Benito, E. Picatoste Olloqui, V. Rives Molina, H. Ruiz, X. Vilasis-Cardona, B. Adeva, P. Alvarez Cartelle, A. Dosil Suárez, V. Fernandez Albor, A. Gallas Torreira, J. García Pardiñas, J.A. Hernando Morata, M. Plo Casasus, A. Romero Vidal, J.J. Saborido Silva, B. Sanmartin Sedes, C. Santamarina Rios, P. Vazquez Regueiro, C. Vázquez Sierra, M. Vieites Diaz, F. Alessio, F. Archilli, C. Barschel, S. Benson, J. Buytaert, D. Campora Perez, L. Castillo Garcia, M. Cattaneo, Ph. Charpentier, X. Cid Vidal, M. Clemencic, J. Closier, V. Coco, P. Collins, G. Corti, B. Couturier, C. D'Ambrosio, F. Dettori, A. Di Canto, H. Dijkstra, P. Durante, M. Ferro-Luzzi, R. Forty, M. Frank, C. Frei, C. Gaspar, V.V. Gligorov, L.A. Granado Cardoso, T. Gys, C. Haen, J. He, T. Head, E. van Herwijnen, R. Jacobsson, D. Johnson, C. Joram, B. Jost, M. Karacson, T.M. Karbach, D. Lacarrere, B. Langhans, R. Lindner, C. Linn, S. Lohn, A. Mapelli, R. Matev, Z. Mathe, S. Neubert, N. Neufeld, A. Otto, J. Panman, M. Pepe Altarelli, N. Rauschmayr, M. Rihl, S. Roiser, T. Ruf, H. Schindler, B. Schmidt, A. Schopper, R. Schwemmer, S. Sridharan, F. Stagni, V.K. Subbiah, F. Teubert, E. Thomas, D. Tonelli, A. Trisovic, M. Ubeda Garcia, J. Wicht, K. Wyllie, V. Battista, A. Bay, F. Blanc, M. Dorigo, F. Dupertuis, C. Fitzpatrick, S. Gianì, G. Haefeli, P. Jaton, C. Khurewathanakul, I. Komarov, V.N. La Thi, N. Lopez-March, R. Märki, M. Martinelli, B. Muster, T. Nakada, A.D. Nguyen, T.D. Nguyen, C. Nguyen-Mau, J. Prisciandaro, A. Puig Navarro, B. Rakotomiaramanana, J. Rouvinet, O. Schneider, F. Soomro, P. Szczypka, M. Tobin, S. Tourneur, M.T. Tran, G. Veneziano, Z. Xu, J. Anderson, R. Bernet, E. Bowen, A. Bursche, N. Chiapolini, M. Chrzaszcz, Ch. Elsasser, E. Graverini, F. Lionetto, P. Lowdon, K. Müller, N. Serra, O. Steinkamp, B. Storaci, U. Straumann, M. Tresch, A. Vollhardt, R. Aaij, S. Ali, M. van Beuzekom, P.N.Y. David, K. De Bruyn, C. Farinelli, V. Heijne, W. Hulsbergen, E. Jans, P. Koppenburg, A. Kozlinskiy, J. van Leerdam, M. Merk, S. Oggero, A. Pellegrino, H. Snoek, J. van Tilburg, P. Tsopelas, N. Tuning, J.A. de Vries, T. Ketel, R.F. Koopman, R.W. Lambert, D. Martinez Santos, G. Raven, M. Schiller, V. Syropoulos, S. Tolk, A. Dovbnya, S. Kandybei, I. Raniuk, O. Okhrimenko, V. Pugatch, S. Bifani, N. Farley, P. Griffith, I.R. Kenyon, C. Lazzeroni, A. Mazurov, J. McCarthy, L. Pescatore, N.K. Watson, M.P. Williams, M. Adinolfi, J. Benton, N.H. Brook, A. Cook, M. Coombes, J. Dalseno, T. Hampson, S.T. Harnew, P. Naik, E. Price, C. Prouve, J.H. Rademacker, S. Richards, D.M. Saunders, N. Skidmore, D. Souza, J.J. Velthuis, D. Voong, W. Barter, M.-O. Bettler, H.V. Cliff, H.-M. Evans, J. Garra Tico, V. Gibson, S. Gregson, S.C. Haines, C.R. Jones, M. Sirendi, J. Smith, D.R. Ward, S.A. Wotton, S. Wright, J.J. Back, T. Blake, D.C. Craik, A.C. Crocombe, D. Dossett, T. Gershon, M. Kreps, C. Langenbruch, T. Latham, D.P. O'Hanlon, T. Pilař, A. Poluektov, M.M. Reid, R. Silva Coutinho, C. Wallace, M. Whitehead, S. Easo, R. Nandakumar, A. Papanestis, S. Ricciardi, F.F. Wilson, L. Carson, P.E.L. Clarke, G.A. Cowan, S. Eisenhardt, D. Ferguson, D. Lambert, H. Luo, A.-B. Morris, F. Muheim, M. Needham, S. Playfer, M. Alexander, J. Beddow, C.-T. Dean, L. Eklund, D. Hynds, S. Karodia, I. Longstaff, S. Ogilvy, M. Pappagallo, P. Sail, I. Skillicorn, F.J.P. Soler, P. Spradlin, A. Affolder, T.J.V. Bowcock, H. Brown, G. Casse, S. Donleavy, K. Dreimanis, S. Farry, R. Fay, K. Hennessy, D. Hutchcroft, M. Liles, B. McSkelly, G.D. Patel, J.D. Price, A. Pritchard, K. Rinnert, T. Shears, N.A. Smith, G. Ciezarek, S. Cunliffe, R. Currie, U. Egede, P. Fol, A. Golutvin, S. Hall, M. McCann, P. Owen, M. Patel, K. Petridis, F. Redi, I. Sepp, E. Smith, W. Sutcliffe, D. Websdale, R.B. Appleby, R.J. Barlow, T. Bird, P.M. Bjørnstad, S. Borghi, D. Brett, J. Brodzicka, L. Capriotti, S. Chen, S. De Capua, G. Dujany, M. Gersabeck, J. Harrison, C. Hombach, S. Klaver, G. Lafferty, A. McNab, C. Parkes, A. Pearce, S. Reichert, E. Rodrigues, P. Rodriguez Perez, M. Smith, S.-F. Cheung, D. Derkach, T. Evans, R. Gauld, E. Greening, N. Harnew, D. Hill, P. Hunt, N. Hussain, J. Jalocha, M. John, O. Lupton, S. Malde, E. Smith, S. Stevenson, C. Thomas, S. Topp-Joergensen, N. Torr, G. Wilkinson, I. Counts, P. Ilten, M. Williams, R. Andreassen, A. Davis, W. De Silva, B. Meadows, M.D. Sokoloff, L. Sun, J. Todd, J.E. Andrews, B. Hamilton, A. Jawahery, J. Wimberley, M. Artuso, S. Blusk, A. Borgia, T. Britton, S. Ely, P. Gandini, J. Garofoli, B. Gui, C. Hadjivasiliou, N. Jurik, M. Kelsey, R. Mountain, B.K. Pal, T. Skwarnicki, S. Stone, J. Wang, Z. Xing, L. Zhang, C. Baesso, M. Cruz Torres, C. Göbel, J. Molina Rodriguez, Y. Xie, D.A. Milanes, O. Grünberg, M. Heß, C. Voß, R. Waldi, T. Likhomanenko, A. Malinin, V. Shevchenko, A. Ustyuzhanin, F. Martinez Vidal, A. Oyanguren, P. Ruiz Valls, C. Sanchez Mayordomo, C.J.G. Onderwater, H.W. Wilschut, E. Pesen
Aug. 17, 2015 hep-ph, hep-ex
A joint measurement is presented of the branching fractions $B^0_s\to\mu^+\mu^-$ and $B^0\to\mu^+\mu^-$ in proton-proton collisions at the LHC by the CMS and LHCb experiments. The data samples were collected in 2011 at a centre-of-mass energy of 7 TeV, and in 2012 at 8 TeV. The combined analysis produces the first observation of the $B^0_s\to\mu^+\mu^-$ decay, with a statistical significance exceeding six standard deviations, and the best measurement of its branching fraction so far. Furthermore, evidence for the $B^0\to\mu^+\mu^-$ decay is obtained with a statistical significance of three standard deviations. The branching fraction measurements are statistically compatible with SM predictions and impose stringent constraints on several theories beyond the SM.
Bose-Einstein correlations in hadron-pairs from lepto-production on nuclei ranging from hydrogen to xenon (1505.03102)
HERMES Collaboration: A. Airapetian, N. Akopov, Z. Akopov, E.C. Aschenauer, W. Augustyniak, R. Avakian, A. Avetissian, E. Avetisyan, S. Belostotski, N. Bianchi, H.P. Blok, A. Borissov, V. Bryzgalov, J. Burns, M. Capiluppi, G.P. Capitani, E. Cisbani, G. Ciullo, M. Contalbrigo, P.F. Dalpiaz, W. Deconinck, R. De Leo, E. De Sanctis, M. Diefenthaler, P. Di Nezza, M. Düren, G. Elbakian, F. Ellinghaus, E. Etzelmüller, R. Fabbri, A. Fantoni, L. Felawka, S. Frullani, G. Gapienko, V. Gapienko, J. Garay García, F. Garibaldi, G. Gavrilov, V. Gharibyan, F. Giordano, S. Gliske, M. Hartig, D. Hasch, Y. Holler, I. Hristova, Y. Imazu, A. Ivanilov, H.E. Jackson, S. Joosten, R. Kaiser, G. Karyan, T. Keri, E. Kinney, A. Kisselev, V. Korotkov, V. Kozlov, P. Kravchenko, V.G. Krivokhijine, L. Lagamba, L. Lapikás, I. Lehmann, P. Lenisa, A. López Ruiz, W. Lorenzon, X.-G. Lu, B.-Q. Ma, D. Mahon, N.C.R. Makins, Y. Mao, B. Marianski, A. Martinez de la Ossa, H. Marukyan, Y. Miyachi, A. Movsisyan, M. Murray, A. Mussgiller, E. Nappi, Y. Naryshkin, A. Nass, M. Negodaev, W.-D. Nowak, L.L. Pappalardo, R. Perez-Benito, A. Petrosyan, P.E. Reimer, A.R. Reolon, C. Riedl, K. Rith, G. Rosner, A. Rostomyan, J. Rubin, D. Ryckbosch, Y. Salomatin, A. Schäfer, G. Schnell, B. Seitz, T.-A. Shibata, V. Shutov, M. Stahl, M. Stancari, M. Statera, J.J.M. Steijger, S. Taroian, A. Terkulov, R. Truty, A. Trzcinski, M. Tytgat, Y. Van Haarlem, C. Van Hulse, D. Veretennikov, V. Vikhrov, I. Vilardi, S. Wang, S. Yaschenko, Z. Ye, S. Yen, B. Zihlmann, P. Zupranski
July 18, 2015 hep-ex, nucl-ex
Bose-Einstein correlations of like-sign charged hadrons produced in deep-inelastic electron and positron scattering are studied in the HERMES experiment using nuclear targets of $^1$H, $^2$H, $^3$He, $^4$He, N, Ne, Kr, and Xe. A Gaussian approach is used to parametrize a two-particle correlation function determined from events with at least two charged hadrons of the same sign charge. This correlation function is compared to two different empirical distributions that do not include the Bose-Einstein correlations. One distribution is derived from unlike-sign hadron pairs, and the second is derived from mixing like-sign pairs from different events. The extraction procedure used simulations incorporating the experimental setup in order to correct the results for spectrometer acceptance effects, and was tested using the distribution of unlike-sign hadron pairs. Clear signals of Bose-Einstein correlations for all target nuclei without a significant variation with the nuclear target mass are found. Also, no evidence for a dependence on the invariant mass W of the photon-nucleon system is found when the results are compared to those of previous experiments.
Testing Hadronic Interaction Models using a Highly Granular Silicon-Tungsten Calorimeter (1411.7215)
The CALICE Collaboration: B. Bilki, J. Schlereth, Z. Yang, M. A. Thomson, Y. Khoulaki, D. J. Kong, K. Francis, B. Green, Y. Miyazaki, T. Yoshioka, V. Ivantchenko, M. Tytgat, K. Gadow, M. Reinecke, S. Laurien, M. Ramilli, E. J. Kim, B. Bobchenko, M. Danilov, R. Mizuk, E. Tarkovsky, C. Kiesling, L. Weuste, S. Conforti di Lorenzo, F. Dulucq, B. Kégl, G. Martin-Chassard, J. Rouëné, E. Becheva, M. Frotin, P. Mora de Freitas, P. Ghislain, P. Gallus, D. Lednicky, M. Tomasek, J. Zalesak Argonne National Laboratory, Argonne, USA, University of Bergen, Bergen, Norway, University of Birmingham, Birmingham, UK, Université Hassan II Aïn Chock, Faculté des sciences, Casablanca, Morocco, Clermont Université, Université Blaise Pascal, Clermont-Ferrand, France, Department of Physics, Kyungpook National University, Daegu, Republic of Korea, NICADD, Northern Illinois University, Department of Physics, DeKalb, USA, Royal Holloway University of London, Dept. of Physics, Egham, UK, CERN, Genève, Switzerland Ghent University, Department of Physics, Astronomy, Gent, Belgium, Laboratoire de Physique Subatomique et de Cosmologie - Université Grenoble-Alpes, Grenoble, France, DESY, Hamburg, Germany, Univ. Hamburg, Physics Department, Institut für Experimentalphysik, Hamburg, Germany, University of Heidelberg, Fakultät für Physik und Astronomie, Heidelberg, Germany, University of Iowa, Dept. of Physics, Astronomy, Iowa City, USA, Chonbuk National University, Jeonju, South Korea, University of Kansas, Department of Physics, Astronomy, Lawrence, USA, Department of Physics, Astronomy, University College London, London, UK Institute of Theoretical, Experimental Physics, Moscow, Russia, MEPhI, Moscow, Russia, Laboratoire de l'Accélérateur Linéaire Laboratoire Leprince-Ringuet Laboratoire de Physique Nucléaire et de Hautes Energies Charles University, Institute of Particle & Nuclear Physics, Prague, Czech Republic, Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic, Department of Physics, Graduate School of Science, The University of Tokyo, Tokyo, Japan Bergische Universität Wuppertal, Wuppertal, Germany, Now at University of Sussex, Also at Moscow Institute of Physics, Technology, Now at COMSATS Institute of Information Technology, Now at Royal Holloway University of London Also at LLR, through excellence cluster P2IO. Now at Max Planck Inst. für Physik, Corresponding author)
A detailed study of hadronic interactions is presented using data recorded with the highly granular CALICE silicon-tungsten electromagnetic calorimeter. Approximately 350,000 selected negatively charged pion events at energies between 2 and 10 GeV have been studied. The predictions of several physics models available within the Geant4 simulation tool kit are compared to this data. A reasonable overall description of the data is observed; the Monte Carlo predictions are within 20% of the data, and for many observables much closer. The largest quantitative discrepancies are found in the longitudinal and transverse distributions of reconstructed energy.
Pentaquark $\Theta^+$ search at HERMES (1412.7317)
The HERMES Collaboration: N. Akopov, Z. Akopov, W. Augustyniak, R. Avakian, A. Avetissian, E. Avetisyan, S. Belostotski, H.P. Blok, A. Borissov, J. Bowles, V. Bryzgalov, J. Burns, G.P. Capitani, E. Cisbani, G. Ciullo, M. Contalbrigo, P.F. Dalpiaz, W. Deconinck, R. De Leo, E. De Sanctis, P. Di Nezza, G. Elbakian, E. Etzelmüller, R. Fabbri, A. Fantoni, L. Felawka, S. Frullani, D. Gabbert, J. Garay García, F. Garibaldi, G. Gavrilov, F. Giordano, S. Gliske, M. Hartig, D. Hasch, Y. Holler, I. Hristova, Y. Imazu, A. Ivanilov, H.E. Jackson, S. Joosten, R. Kaiser, G. Karyan, T. Keri, E. Kinney, A. Kisselev, V. Kozlov, P. Kravchenko, V.G. Krivokhijine, L. Lagamba, L. Lapikás, I. Lehmann, A. López Ruiz, W. Lorenzon, X. Lu, B.-Q. Ma, D. Mahon, S.I. Manaenkov, Y. Mao, B. Marianski, A. Martinez de la Ossa, H. Marukyan, C.A. Miller, Y. Miyachi, A. Movsisyan, M. Murray, E. Nappi, A. Nass, M. Negodaev, W.-D. Nowak, L.L. Pappalardo, R. Perez-Benito, A. Petrosyan, P.E. Reimer, A.R. Reolon, C. Riedl, K. Rith, G. Rosner, A. Rostomyan, J. Rubin, D. Ryckbosch, Y. Salomatin, G. Schnell, K.P. Schüler, B. Seitz, T.-A. Shibata, M. Stancari, J.J.M. Steijger, S. Taroian, A. Terkulov, R. Truty, A. Trzcinski, M. Tytgat, Y. Van Haarlem, C. Van Hulse, D. Veretennikov, V. Vikhrov, I. Vilardi, S. Wang, S. Yaschenko, H. Ye, Z. Ye, S. Yen, B. Zihlmann, P. Zupranski
April 27, 2015 hep-ex
The earlier search at HERMES for narrow baryon states excited in quasi-real photoproduction, decaying through the channel $pK_S^0\rightarrow p\pi^+\pi^-$, has been extended with improved decay-particle reconstruction, more advanced particle identification, and increased event samples. The structure observed earlier at an invariant mass of 1528 MeV shifts to 1522 MeV and the statistical significance drops to about 2$\sigma$ for data taken with a deuterium target. The number of events above background is $68_{-31}^{+98}\text{(stat)}\pm13\text{(sys)}$. No such structure is observed in the hydrogen data set.
Performance of a Large-Area GEM Detector Prototype for the Upgrade of the CMS Muon Endcap System (1412.0228)
D.Abbaneo, M. Abbas, M. Abbrescia, A.A. Abdelalim, M. Abi Akl, W. Ahmed, W. Ahmed, P. Altieri, R. Aly, C. Asawatangtrakuldee, A. Ashfaq, P. Aspell, Y. Assran, I. Awan, S. Bally, Y. Ban, S. Banerjee, P. Barria, L.Benussi, V. Bhopatkar, S. Bianco, J. Bos, O. Bouhali, S. Braibant, S. Buontempo, C. Calabria, M. Caponero, C. Caputo, F. Cassese, A. Castaneda, S. Cauwenbergh, F.R. Cavallo, A. Celik, M. Choi, K. Choi, S. Choi, J. Christiansen, A. Cimmino, S. Colafranceschi, A. Colaleo, A. Conde Garcia, M.M.Dabrowski, G. De Lentdecker, R. De Oliveira, G.de Robertis, S. Dildick, B.Dorney, W. Elmetenawee, G. Fabrice, M. Ferrini, S. Ferry, P. Giacomelli, J. Gilmore, L. Guiducci, A. Gutierrez, R.M. Hadjiiska, A. Hassan, J. Hauser, K. Hoepfner, M. Hohlmann, H. Hoorani, Y.G. Jeng, T. Kamon, P.E. Karchin, H.S. Kim, S. Krutelyov, A. Kumar, J. Lee, T. Lenzi, L. Litov, F. Loddo, T. Maerschalk, G. Magazzu, M. Maggi, Y. Maghrbi, A. Magnani, N. Majumdar, P.K. Mal, K. Mandal, A. Marchioro, A. Marinov, J.A. Merlin, A.K. Mohanty, A. Mohapatra, S. Muhammad, S. Mukhopadhyay, M. Naimuddin, S. Nuzzo, E. Oliveri, L.M. Pant, P. Paolucci, I. Park, G. Passeggio, B. Pavlov, B. Philipps, M. Phipps, D. Piccolo, H. Postema, G. Pugliese, A. Puig Baranac, A. Radi, R. Radogna, G. Raffone, S. Ramkrishna, A. Ranieri, C. Riccardi, A. Rodrigues, L. Ropelewski, S. RoyChowdhury, M.S. Ryu, G. Ryu, A. Safonov, A. Sakharov, S. Salva, G. Saviano, A. Sharma, S.K. Swain, J.P. Talvitie, C. Tamma, A. Tatarinov, N. Turini, T. Tuuva, J. Twigger, M. Tytgat, I. Vai, M. van Stenis, R. Venditi, E. Verhagen, P. Verwilligen, P. Vitulo, D. Wang, M. Wang, U. Yang, Y. Yang, R. Yonamine, N. Zaganidis, F. Zenoni, A. Zhang
Dec. 8, 2014 physics.ins-det
Gas Electron Multiplier (GEM) technology is being considered for the forward muon upgrade of the CMS experiment in Phase 2 of the CERN LHC. Its first implementation is planned for the GE1/1 system in the $1.5 < \mid\eta\mid < 2.2$ region of the muon endcap mainly to control muon level-1 trigger rates after the second long LHC shutdown. A GE1/1 triple-GEM detector is read out by 3,072 radial strips with 455 $\mu$rad pitch arranged in eight $\eta$-sectors. We assembled a full-size GE1/1 prototype of 1m length at Florida Tech and tested it in 20-120 GeV hadron beams at Fermilab using Ar/CO$_{2}$ 70:30 and the RD51 scalable readout system. Four small GEM detectors with 2-D readout and an average measured azimuthal resolution of 36 $\mu$rad provided precise reference tracks. Construction of this largest GEM detector built to-date is described. Strip cluster parameters, detection efficiency, and spatial resolution are studied with position and high voltage scans. The plateau detection efficiency is [97.1 $\pm$ 0.2 (stat)]\%. The azimuthal resolution is found to be [123.5 $\pm$ 1.6 (stat)] $\mu$rad when operating in the center of the efficiency plateau and using full pulse height information. The resolution can be slightly improved by $\sim$ 10 $\mu$rad when correcting for the bias due to discrete readout strips. The CMS upgrade design calls for readout electronics with binary hit output. When strip clusters are formed correspondingly without charge-weighting and with fixed hit thresholds, a position resolution of [136.8 $\pm$ 2.5 stat] $\mu$rad is measured, consistent with the expected resolution of strip-pitch/$\sqrt{12}$ = 131.3 $\mu$rad. Other $\eta$-sectors of the detector show similar response and performance.
Transverse polarization of $\Lambda$ hyperons from quasireal photoproduction on nuclei (1406.3236)
The HERMES Collaboration: A. Airapetian, N. Akopov, Z. Akopov, E.C. Aschenauer, W. Augustyniak, R. Avakian, A. Avetissian, E. Avetisyan, S. Belostotski, N. Bianchi, H.P. Blok, A. Borissov, J. Bowles, I. Brodski, V. Bryzgalov, J. Burns, M. Capiluppi, G.P. Capitani, E. Cisbani, G. Ciullo, M. Contalbrigo, P.F. Dalpiaz, W. Deconinck, R. De Leo, L. De Nardo, E. De Sanctis, M. Diefenthaler, P. Di Nezza, M. Düren, M. Ehrenfried, G. Elbakian, F. Ellinghaus, R. Fabbri, A. Fantoni, L. Felawka, S. Frullani, D. Gabbert, G. Gapienko, V. Gapienko, F. Garibaldi, G. Gavrilov, V. Gharibyan, F. Giordano, S. Gliske, M. Golembiovskaya, C. Hadjidakis, M. Hartig, D. Hasch, A. Hillenbrand, M. Hoek, Y. Holler, I. Hristova, Y. Imazu, A. Ivanilov, H.E. Jackson, H.S. Jo, S. Joosten, R. Kaiser, G. Karyan, T. Keri, E. Kinney, A. Kisselev, N. Kobayashi, V. Korotkov, V. Kozlov, P. Kravchenko, V.G. Krivokhijine, L. Lagamba, L. Lapikás, I. Lehmann, P. Lenisa, A. López Ruiz, W. Lorenzon, X.-G. Lu, B.-Q. Ma, D. Mahon, N.C.R. Makins, S.I. Manaenkov, Y. Mao, B. Marianski, A. Martinez de la Ossa, H. Marukyan, C.A. Miller, Y. Miyachi, A. Movsisyan, V. Muccifora, M. Murray, A. Mussgiller, E. Nappi, Y. Naryshkin, A. Nass, M. Negodaev, W.-D. Nowak, L.L. Pappalardo, R. Perez-Benito, P.E. Reimer, A.R. Reolon, C. Riedl, K. Rith, G. Rosner, A. Rostomyan, J. Rubin, D. Ryckbosch, Y. Salomatin, F. Sanftl, A. Schäfer, G. Schnell, K.P. Schüler, B. Seitz, T.-A. Shibata, V. Shutov, M. Stancari, M. Statera, E. Steffens, J.J.M. Steijger, J. Stewart, F. Stinzing, S. Taroian, A. Terkulov, R. Truty, A. Trzcinski, M. Tytgat, A. Vandenbroucke, Y. Van Haarlem, C. Van Hulse, D. Veretennikov, V. Vikhrov, I. Vilardi, S. Wang, S. Yaschenko, Z. Ye, W. Yu, V. Zagrebelnyy, D. Zeiler, B. Zihlmann, P. Zupranski
Oct. 3, 2014 hep-ex, nucl-ex
The transverse polarization of $\Lambda$ hyperons was measured in inclusive quasireal photoproduction for various target nuclei ranging from hydrogen to xenon. The data were obtained by the HERMES experiment at HERA using the 27.6 GeV lepton beam and nuclear gas targets internal to the lepton storage ring. The polarization observed is positive for light target nuclei and is compatible with zero for krypton and xenon.
The Time Structure of Hadronic Showers in highly granular Calorimeters with Tungsten and Steel Absorbers (1404.6454)
C. Adloff, J.-J. Blaising, M. Chefdeville, C. Drancourt, R. Gaglione, N. Geffroy, Y. Karyotakis, I. Koletsou, J. Prast, G. Vouters J. Repond, J. Schlereth, L. Xia E. Baldolemar, J. Li, S. T. Park, M. Sosebee, A. P. White, J. Yu, G. Eigen, M. A. Thomson, D. R. Ward, D. Benchekroun, A. Hoummada, Y. Khoulaki J. Apostolakis, S. Arfaoui, M. Benoit, D. Dannheim, K. Elsener, G. Folger, C. Grefe, V. Ivantchenko, M. Killenberg, W. Klempt, E. van der Kraaij, L. Linssen, A.-I. Lucaci-Timoce, A. Münnich, S. Poss, A. Ribon, P. Roloff, A. Sailer, D. Schlatter, E. Sicking, J. Strube, V. Uzhinskiy, C. Carloganu, P. Gay, S. Manen, L. Royer, U. Cornett, D. David, A. Ebrahimi, G. Falley, N. Feege, K. Gadow, P. Göttlicher, C. Günter, O. Hartbrich, B. Hermberg, S. Karstensen, F. Krivan, K. Krüger, S. Lu, B. Lutz, S. Morozov, V. Morgunov, C. Neubüser, M. Reinecke, F. Sefkow, P. Smirnov, M. Terwort, A. Fagot, M. Tytgat, N. Zaganidis, J.-Y. Hostachy, L. Morin, E. Garutti, S. Laurien, I. Marchesini, M. Matysek, M. Ramilli, K. Briggl, P. Eckert, T. Harion, H.-Ch. Schultz-Coulon, W. Shen, R. Stamen, S. Chang, A. Khan, D. H. Kim, D. J. Kong, Y. D. Oh, B. Bilki, E. Norbeck, D. Northacker, Y. Onel, G. W. Wilson, K. Kawagoe, Y. Miyazaki, Y. Sudo, H. Ueno, T. Yoshioka, P. D. Dauncey, E. Cortina Gil, S. Mannai, G. Baulieu, P. Calabria, L. Caponetto, C. Combaret, R. Della Negra, R. Ete, G. Grenier, R. Han, J-C. Ianigro, R. Kieffer, I. Laktineh, N. Lumb, H. Mathez, L. Mirabito, A. Petrukhin, A. Steen, W. Tromeur, M. Vander Donckt, Y. Zoccarato J. Berenguer Antequera, E. Calvo Alamillo, M.-C. Fouz, J. Puerta-Pelayo, F. Corriveau, B. Bobchenko, M. Chadeeva, M. Danilov, A. Epifantsev, O. Markin, R. Mizuk, E. Novikov, V. Rusinov, E. Tarkovsky, V. Kozlov, Y. Soloviev, D. Besson, P. Buzhan, A. Ilyin, V. Kantserov, V. Kaplin, E. Popova, V. Tikhomirov, M. Gabriel, C. Kiesling, K. Seidel, F. Simon, C. Soldner, M. Szalay, M. Tesar, L. Weuste, M. S. Amjad, J. Bonis, S. Conforti di Lorenzo, P. Cornebise, J. Fleury, T. Frisson, N. van der Kolk, F. Richard, R. Pöschl, J. Rouene, M. Anduze, V. Balagura, E. Becheva, V. Boudry, J-C. Brient, R. Cornat, M. Frotin, F. Gastaldi, E. Guliyev, Y. Haddad, F. Magniette, M. Ruan, T.H. Tran, H. Videau, S. Callier, F. Dulucq, G. Martin-Chassard, Ch. de la Taille, L. Raux, N. Seguin-Moreau, J. Zacek, J. Cvach, P. Gallus, M. Havranek, M. Janata, J. Kvasnicka, D. Lednicky, M. Marcisovsky, I. Polak, J. Popule, L. Tomasek, M. Tomasek, P. Ruzicka, P. Sicho, J. Smolik, V. Vrba, J. Zalesak, . Belhorma, H. Ghazlane, K. Kotera, H. Ono, T. Takeshita, S. Uozumi, J. S. Chai, H. S. Song, S. H. Lee, M. Götze, J. Sauer, S. Weber, C. Zeitnitz (The CALICE Collaboration)
The intrinsic time structure of hadronic showers influences the timing capability and the required integration time of hadronic calorimeters in particle physics experiments, and depends on the active medium and on the absorber of the calorimeter. With the CALICE T3B experiment, a setup of 15 small plastic scintillator tiles read out with Silicon Photomultipliers, the time structure of showers is measured on a statistical basis with high spatial and temporal resolution in sampling calorimeters with tungsten and steel absorbers. The results are compared to GEANT4 (version 9.4 patch 03) simulations with different hadronic physics models. These comparisons demonstrate the importance of using high precision treatment of low-energy neutrons for tungsten absorbers, while an overall good agreement between data and simulations for all considered models is observed for steel.
Reevaluation of the parton distribution of strange quarks in the nucleon (1312.7028)
The HERMES Collaboration: A. Airapetian, N. Akopov, Z. Akopov, E.C. Aschenauer, W. Augustyniak, A. Avetissian, E. Avetisyan, S. Belostotski, H.P. Blok, A. Borissov, V. Bryzgalov, J. Burns, M. Capiluppi, G.P. Capitani, E. Cisbani, G. Ciullo, M. Contalbrigo, P.F. Dalpiaz, W. Deconinck, R. De Leo, E. De Sanctis, M. Diefenthaler, P. Di Nezza, M. Düren, M. Ehrenfried, G. Elbakian, F. Ellinghaus, E. Etzelmüller, L. Felawka, S. Frullani, D. Gabbert, G. Gapienko, V. Gapienko, J. Garay García, F. Garibaldi, G. Gavrilov, V. Gharibyan, F. Giordano, S. Gliske, M. Hartig, D. Hasch, M. Hoek, Y. Holler, I. Hristova, H.E. Jackson, S. Joosten, R. Kaiser, G. Karyan, T. Keri, E. Kinney, A. Kisselev, V. Korotkov, V. Kozlov, P. Kravchenko, V.G. Krivokhijine, L. Lagamba, L. Lapikás, I. Lehmann, P. Lenisa, W. Lorenzon, B.-Q. Ma, D. Mahon, S.I. Manaenkov, Y. Mao, B. Marianski, H. Marukyan, Y. Miyachi, A. Movsisyan, V. Muccifora, M. Murray, A. Mussgiller, Y. Naryshkin, A. Nass, M. Negodaev, W.-D. Nowak, L.L. Pappalardo, R. Perez-Benito, A. Petrosyan, P.E. Reimer, A.R. Reolon, C. Riedl, K. Rith, G. Rosner, A. Rostomyan, J. Rubin, D. Ryckbosch, Y. Salomatin, A. Schäfer, G. Schnell, B. Seitz, T.-A. Shibata, M. Stahl, M. Statera, E. Steffens, J.J.M. Steijger, F. Stinzing, S. Taroian, A. Terkulov, R. Truty, A. Trzcinski, M. Tytgat, Y. Van Haarlem, C. Van Hulse, D. Veretennikov, V. Vikhrov, I. Vilardi, C. Vogel, S. Wang, S. Yaschenko, Z. Ye, S. Yen, B. Zihlmann, P. Zupranski
An earlier extraction from the HERMES experiment of the polarization-averaged parton distribution of strange quarks in the nucleon has been reevaluated using final data on the multiplicities of charged kaons in semi-inclusive deep-inelastic scattering obtained with a kinematically more comprehensive method of correcting for experimental effects. General features of the distribution are confirmed, but the rise at low x is less pronounced than previously reported.
Performance of the first prototype of the CALICE scintillator strip electromagnetic calorimeter (1311.3761)
CALICE Collaboration: K. Francis, J. Repond, J. Schlereth, J. Smith, L. Xia, E. Baldolemar, J. Li, S. T. Park, M. Sosebee, A. P. White, J. Yu, G. Eigen, Y. Mikami, N. K. Watson, M. A. Thomson, D. R. Ward, D. Benchekroun, A. Hoummada, Y. Khoulaki, J. Apostolakis, A. Dotti, G. Folger, V. Ivantchenko, A. Ribon, V. Uzhinskiy, C. Carloganu, P. Gay, S. Manen, L. Royer, M. Tytgat, N. Zaganidis, G. C. Blazey, A. Dyshkant, J. G. R. Lima, V. Zutshi, J. -Y. Hostachy, L. Morin, U. Cornett, D. David, A. Ebrahimi, G. Falley, K. Gadow, P. Goettlicher, C. Guenter, O. Hartbrich, B. Hermberg, S. Karstensen, F. Krivan, K. Krueger, B. Lutz, S. Morozov, V. Morgunov, C. Neubueser, M. Reinecke, F. Sefkow, P. Smirnov, M. Terwort, E. Garutti, S. Laurien, S. Lu, I. Marchesini, M. Matysek, M. Ramilli, K. Briggl, P. Eckert, T. Harion, H.-Ch. Schultz-Coulon, W. Shen, R. Stamen, B. Bilki, E. Norbeck, D. Northacker, Y. Onel, G. W. Wilson, K. Kawagoe, Y. Sudo, T. Yoshioka, P. D. Dauncey, M. Wing, F. Salvatore, E. Cortina Gil, S. Mannai, G. Baulieu, P. Calabria, L. Caponetto, C. Combaret, R. Della Negra, G. Grenier, R. Han, J-C. Ianigro, R. Kieffer, I. Laktineh, N. Lumb, H. Mathez, L. Mirabito, A. Petrukhin, A. Steen, W. Tromeur, M. Vander Donckt, Y. Zoccarato, E. Calvo Alamillo, M.-C. Fouz, J. Puerta-Pelayo, F. Corriveau, B. Bobchenko, M. Chadeeva, M. Danilov, A. Epifantsev, O. Markin, R. Mizuk, E. Novikov, V. Popov, V. Rusinov, E. Tarkovsky, D. Besson, P. Buzhan, A. Ilyin, V. Kantserov, V. Kaplin, A. Karakash, E. Popova, V. Tikhomirov, C. Kiesling, K. Seidel, F. Simon, C. Soldner, L. Weuste, M. S. Amjad, J. Bonis, S. Callier, S. Conforti di Lorenzo, P. Cornebise, Ph. Doublet, F. Dulucq, J. Fleury, T. Frisson, N. van der Kolk, H. Li, G. Martin-Chassard, F. Richard, Ch. de la Taille, R. Poeschl, L. Raux, J. Rouene, N. Seguin-Moreau, M. Anduze, V. Balagura, V. Boudry, J-C. Brient, R. Cornat, M. Frotin, F. Gastaldi, E. Guliyev, Y. Haddad, F. Magniette, G. Musat, M. Ruan, T. H. Tran, H. Videau, B. Bulanek, J. Zacek, J. Cvach, P. Gallus, M. Havranek, M. Janata, J. Kvasnicka, D. Lednicky, M. Marcisovsky, I. Polak, J. Popule, L. Tomasek, M. Tomasek, P. Ruzicka, P. Sicho, J. Smolik, V. Vrba, J. Zalesak, B. Belhorma, H. Ghazlane, K. Kotera, H. Ono, T. Takeshita, S. Uozumi, D. Jeans, S. Chang, A. Khan, D. H. Kim, D. J. Kong, Y. D. Oh, M. Goetze, J. Sauer, S. Weber, C. Zeitnitz
A first prototype of a scintillator strip-based electromagnetic calorimeter was built, consisting of 26 layers of tungsten absorber plates interleaved with planes of 45x10x3 mm3 plastic scintillator strips. Data were collected using a positron test beam at DESY with momenta between 1 and 6 GeV/c. The prototype's performance is presented in terms of the linearity and resolution of the energy measurement. These results represent an important milestone in the development of highly granular calorimeters using scintillator strip technology. This technology is being developed for a future linear collider experiment, aiming at the precise measurement of jet energies using particle flow techniques.
Beam-helicity asymmetry in associated electroproduction of real photons $ep \to e\gamma \pi N$ in the $\Delta$-resonance region (1310.5081)
The HERMES Collaboration: A. Airapetian, N. Akopov, E.C. Aschenauer, W. Augustyniak, R. Avakian, A. Avetissian, E. Avetisyan, H.P. Blok, H. Böttcher, A. Borissov, J. Bowles, I. Brodski, V. Bryzgalov, J. Burns, G.P. Capitani, E. Cisbani, G. Ciullo, M. Contalbrigo, P.F. Dalpiaz, W. Deconinck, R. De Leo, E. De Sanctis, M. Diefenthaler, P. Di Nezza, M. Düren, M. Ehrenfried, G. Elbakian, F. Ellinghaus, E. Etzelmüller, R. Fabbri, S. Frullani, G. Gapienko, V. Gapienko, J. Garay García, F. Garibaldi, G. Gavrilov, V. Gharibyan, F. Giordano, S. Gliske, M. Hartig, D. Hasch, Y. Holler, I. Hristova, A. Ivanilov, H.E. Jackson, S. Joosten, R. Kaiser, G. Karyan, T. Keri, E. Kinney, A. Kisselev, V. Korotkov, V. Kozlov, P. Kravchenko, V.G. Krivokhijine, L. Lagamba, L. Lapikás, I. Lehmann, P. Lenisa, W. Lorenzon, X.-G. Lu, B.-Q. Ma, D. Mahon, N.C.R. Makins, S.I. Manaenkov, Y. Mao, B. Marianski, H. Marukyan, C.A. Miller, Y. Miyachi, A. Movsisyan, V. Muccifora, M. Murray, A. Mussgiller, Y. Naryshkin, A. Nass, M. Negodaev, W.-D. Nowak, L.L. Pappalardo, R. Perez-Benito, A. Petrosyan, P.E. Reimer, A.R. Reolon, C. Riedl, K. Rith, G. Rosner, A. Rostomyan, J. Rubin, D. Ryckbosch, Y. Salomatin, A. Schäfer, G. Schnell, B. Seitz, T.-A. Shibata, M. Stahl, M. Statera, E. Steffens, J.J.M. Steijger, J. Stewart, F. Stinzing, S. Taroian, A. Terkulov, R. Truty, A. Trzcinski, M. Tytgat, Y. Van Haarlem, C. Van Hulse, V. Vikhrov, I. Vilardi, S. Wang, S. Yaschenko, Z. Ye, S. Yen, V. Zagrebelnyy, B. Zihlmann, P. Zupranski
Feb. 11, 2014 hep-ex, nucl-ex
The beam-helicity asymmetry in associated electroproduction of real photons, $ep\to e\gamma \pi N$, in the $\Delta$(1232)-resonance region is measured using the longitudinally polarized HERA positron beam and an unpolarized hydrogen target. Azimuthal Fourier amplitudes of this asymmetry are extracted separately for two channels, $ep\to e\gamma \pi^0 p$ and $ep\to e\gamma \pi^+ n$, from a data set collected with a recoil detector. All asymmetry amplitudes are found to be consistent with zero.
Shower development of particles with momenta from 1 to 10 GeV in the CALICE Scintillator-Tungsten HCAL (1311.3505)
C. Adloff, J.-J. Blaising, M. Chefdeville, C. Drancourt, R. Gaglione, N. Geffroy, Y. Karyotakis, I. Koletsou, J. Prast, G. Vouters, J. Repond, J. Schlereth, J. Smith, L. Xia, E. Baldolemar, J. Li, S. T. Park, M. Sosebee, A. P. White, J. Yu, G. Eigen, M. A. Thomson, D. R.Ward, D. Benchekroun, A. Hoummada, Y. Khoulaki, J. Apostolakis, D. Dannheim, A. Dotti, K. Elsener, G. Folger, C. Grefe, V. Ivantchenko, M. Killenberg, W. Klempt, E. van der Kraaij, C. B. Lam, L. Linssen, A.-I. Lucaci-Timoce, A. Muennich, S. Poss, A. Ribon, A. Sailer, D. Schlatter, J. Strube, V. Uzhinskiy, C. Carloganu, P. Gay, S. Manen, L. Royer, M. Tytgat, N. Zaganidis, G. C. Blazey, A. Dyshkant, J. G. R. Lima, V. Zutshi, J.-Y. Hostachy, L. Morin, U. Cornett, D. David, A. Ebrahimi, G. Falley, N. Feege, K. Gadow, P. Goettlicher, C. Guenter, O. Hartbrich, B. Hermberg, S. Karstensen, F. Krivan, K. Krueger, S. Lu, B. Lutz, S. Morozov, V. Morgunov, C. Neubueser, M. Reinecke, F. Sefkow, P. Smirnov, M. Terwort, E. Garutti, S. Laurien, I. Marchesini, M. Matysek, M. Ramilli, K. Briggl, P. Eckert, T. Harion, H.-Ch. Schultz-Coulon, W. Shen, R. Stamen, B. Bilki, E. Norbeck, D. Northacker, Y. Onel, G. W. Wilson, K. Kawagoe, Y. Sudo, T. Yoshioka, P. D. Dauncey, M. Wing, F. Salvatore, E. Cortina Gil, S. Mannai, G. Baulieu, P. Calabria, L. Caponetto, C. Combaret, R. Della Negra, G. Grenier, R. Han, J-C. Ianigro, R. Kieffer, I. Laktineh, N. Lumb, H. Mathez, L. Mirabito, A. Petrukhin, A. Steen, W. Tromeur, M. Vander Donckt, Y. Zoccarato, E. Calvo Alamillo, M.-C. Fouz, J. Puerta-Pelayo, F. Corriveau, B. Bobchenko, M. Chadeeva, M. Danilov, A. Epifantsev, O. Markin, R. Mizuk, E. Novikov, V. Popov, V. Rusinov, E. Tarkovsky, N. Kirikova, V. Kozlov, P. Smirnov, Y. Soloviev, D. Besson, P. Buzhan, A. Ilyin, V. Kantserov, V. Kaplin, A. Karakash, E. Popova, V. Tikhomirov, C. Kiesling, K. Seidel, F. Simon, C. Soldner, M. Szalay, M. Tesar, L. Weuste, M. S. Amjad, J. Bonis, S. Callier, S. Conforti di Lorenzo, P. Cornebise, Ph. Doublet, F. Dulucq, J. Fleury, T. Frisson, N. van der Kolk, H. Li, G. Martin-Chassard, F. Richard, Ch.de la Taille, R. Poeschl, L. Raux, J. Rouene, N. Seguin-Moreau, M. Anduze, V. Balagura, V. Boudry, J-C. Brient, R. Cornat, M. Frotin, F. Gastaldi, E. Guliyev, Y. Haddad, F. Magniette, G. Musat, M. Ruan, T. H. Tran, H. Videau, B. Bulanek, J. Zacek, J. Cvach, P. Gallus, M. Havranek, M. Janata, J. Kvasnicka, D. Lednicky, M. Marcisovsky, I. Polak, J. Popule, L. Tomasek, M. Tomasek, P. Ruzicka, P. Sicho, J. Smolik, V. Vrba, J. Zalesak, B. Belhorma, H. Ghazlane, K. Kotera, T. Takeshita, S. Uozumi, S. Chang, A. Khan, D. H. Kim, D. J. Kong, Y. D. Oh, M. Goetze, J. Sauer, S. Weber, C. Zeitnitz
Jan. 13, 2014 physics.ins-det
Lepton colliders are considered as options to complement and to extend the physics programme at the Large Hadron Collider. The Compact Linear Collider (CLIC) is an $e^+e^-$ collider under development aiming at centre-of-mass energies of up to 3 TeV. For experiments at CLIC, a hadron sampling calorimeter with tungsten absorber is proposed. Such a calorimeter provides sufficient depth to contain high-energy showers, while allowing a compact size for the surrounding solenoid. A fine-grained calorimeter prototype with tungsten absorber plates and scintillator tiles read out by silicon photomultipliers was built and exposed to particle beams at CERN. Results obtained with electrons, pions and protons of momenta up to 10 GeV are presented in terms of energy resolution and shower shape studies. The results are compared with several GEANT4 simulation models in order to assess the reliability of the Monte Carlo predictions relevant for a future experiment at CLIC.
Transverse target single-spin asymmetry in inclusive electroproduction of charged pions and kaons (1310.5070)
The HERMES Collaboration: A. Airapetian, N. Akopov, Z. Akopov, E.C. Aschenauer, W. Augustyniak, R. Avakian, A. Avetissian, E. Avetisyan, S. Belostotski, N. Bianchi, H.P. Blok, A. Borissov, J. Bowles, V. Bryzgalov, J. Burns, M. Capiluppi, G.P. Capitani, E. Cisbani, G. Ciullo, M. Contalbrigo, P.F. Dalpiaz, W. Deconinck, R. De Leo, L. De Nardo, E. De Sanctis, M. Diefenthaler, P. Di Nezza, M. Düren, M. Ehrenfried, G. Elbakian, F. Ellinghaus, R. Fabbri, A. Fantoni, L. Felawka, S. Frullani, D. Gabbert, G. Gapienko, V. Gapienko, G. Gavrilov, V. Gharibyan, F. Giordano, S. Gliske, M. Golembiovskaya, C. Hadjidakis, M. Hartig, D. Hasch, A. Hillenbrand, M. Hoek, Y. Holler, I. Hristova, A. Ivanilov, H.E. Jackson, S. Joosten, R. Kaiser, G. Karyan, T. Keri, E. Kinney, A. Kisselev, V. Korotkov, V. Kozlov, P. Kravchenko, V.G. Krivokhijine, L. Lagamba, L. Lapikás, I. Lehmann, P. Lenisa, A. López Ruiz, W. Lorenzon, B.-Q. Ma, D. Mahon, N.C.R. Makins, S.I. Manaenkov, Y. Mao, B. Marianski, A. Martinez de la Ossa, H. Marukyan, C.A. Miller, Y. Miyachi, A. Movsisyan, V. Muccifora, M. Murray, A. Mussgiller, E. Nappi, Y. Naryshkin, A. Nass, M. Negodaev, W.-D. Nowak, L.L. Pappalardo, R. Perez-Benito, A. Petrosyan, M. Raithel, P.E. Reimer, A.R. Reolon, C. Riedl, K. Rith, G. Rosner, A. Rostomyan, J. Rubin, D. Ryckbosch, Y. Salomatin, F. Sanftl, A. Schäfer, G. Schnell, B. Seitz, T.-A. Shibata, V. Shutov, M. Stancari, M. Statera, E. Steffens, J.J.M. Steijger, J. Stewart, F. Stinzing, S. Taroian, A. Terkulov, R. Truty, A. Trzcinski, M. Tytgat, Y. Van Haarlem, C. Van Hulse, D. Veretennikov, V. Vikhrov, I. Vilardi, S. Wang, S. Yaschenko, Z. Ye, S. Yen, W. Yu, V. Zagrebelnyy, D. Zeiler, B. Zihlmann, P. Zupranski
Oct. 18, 2013 hep-ex, nucl-ex
Single-spin asymmetries were investigated in inclusive electroproduction of charged pions and kaons from transversely polarized protons at the HERMES experiment. The asymmetries were studied as a function of the azimuthal angle $\psi$ about the beam direction between the target-spin direction and the hadron production plane, the transverse hadron momentum relative to the direction of the incident beam, and the Feynman variable $x_F$. The $\sin(\psi)$ amplitudes are positive for positive pions and kaons, slightly negative for negative pions and consistent with zero for negative kaons, with particular transverse-momentum but weak $x_F$ dependences. Especially large asymmetries are observed for two small subsamples of events, where also the scattered electron was recorded by the spectrometer.
Track segments in hadronic showers in a highly granular scintillator-steel hadron calorimeter (1305.7027)
CALICE Collaboration: C. Adloff, J.-J. Blaising, M. Chefdeville, C. Drancourt, R. Gaglione, N. Geffroy, Y. Karyotakis, I. Koletsou, J. Prast, G. Vouters, K. Francis, J. Repond, J. Schlereth, J. Smith, L. Xia, E. Baldolemar, J. Li, S. T. Park, M. Sosebee, A. P. White, J. Yu, G. Eigen, Y. Mikami, N. K. Watson, G. Mavromanolakis, M. A. Thomson, D. R. Ward, W. Yan, D. Benchekroun, A. Hoummada, Y. Khoulaki, J. Apostolakis, D. Dannheim, A. Dotti, G. Folger, V. Ivantchenko, W. Klempt, E. van der Kraaij, A. -I. Lucaci-Timoce, A. Ribon, D. Schlatter, V. Uzhinskiy, C. Carloganu, P. Gay, S. Manen, L. Royer, M. Tytgat, N. Zaganidis, G. C. Blazey, A. Dyshkant, J. G. R. Lima, V. Zutshi, J. -Y. Hostachy, L. Morin, U. Cornett, D. David, G. Falley, K. Gadow, P. Göttlicher, C. Günter, O. Hartbrich, B. Hermberg, S. Karstensen, F. Krivan, K. Krüger, S. Lu, S. Morozov, V. Morgunov, M. Reinecke, F. Sefkow, P. Smirnov, M. Terwort, N. Feege, E. Garutti, S. Laurien, I. Marchesini, M. Matysek, M. Ramilli, K. Briggl, P. Eckert, T. Harion, H. -Ch. Schultz-Coulon, W. Shen, R. Stamen, B. Bilki, E. Norbeck, Y. Onel, G. W. Wilson, K. Kawagoe, Y. Sudo, T. Yoshioka, P. D. Dauncey, A. -M. Magnan, V. Bartsch, M. Wing, F. Salvatore, E. Cortina Gil, S. Mannai, G. Baulieu, P. Calabria, L. Caponetto, C. Combaret, R. Della Negra, G. Grenier, R. Han, J-C. Ianigro, R. Kieffer, I. Laktineh, N. Lumb, H. Mathez, L. Mirabito, A. Petrukhin, A. Steen, W. Tromeur, M. Vander Donckt, Y. Zoccarato, E. Calvo Alamillo, M.-C. Fouz, J. Puerta-Pelayo, F. Corriveau, B. Bobchenko, M. Chadeeva, M. Danilov, A. Epifantsev, O. Markin, R. Mizuk, E. Novikov, V. Popov, V. Rusinov, E. Tarkovsky, N. Kirikova, V. Kozlov, P. Smirnov, Y. Soloviev, P. Buzhan, A. Ilyin, V. Kantserov, V. Kaplin, A. Karakash, E. Popova, V. Tikhomirov, C. Kiesling, K. Seidel, F. Simon, C. Soldner, M. Szalay, M. Tesar, L. Weuste, M. S. Amjad, J. Bonis, S. Callier, S. Conforti di Lorenzo, P. Cornebise, Ph. Doublet, F. Dulucq, J. Fleury, T. Frisson, N. van der Kolk, H. Li, G. Martin-Chassard, F. Richard, Ch. de la Taille, R. Pöschl, L. Raux, J. Rouene, N. Seguin-Moreau, M. Anduze, V. Balagura, V. Boudry, J-C. Brient, R. Cornat, M. Frotin, F. Gastaldi, E. Guliyev, Y. Haddad, F. Magniette, G. Musat, M. Ruan, T.H. Tran, H. Videau, B. Bulanek, J. Zacek, J. Cvach, P. Gallus, M. Havranek, M. Janata, J. Kvasnicka, D. Lednicky, M. Marcisovsky, I. Polak, J. Popule, L. Tomasek, M. Tomasek, P. Ruzicka, P. Sicho, J. Smolik, V. Vrba, J. Zalesak, B. Belhorma, H. Ghazlane, K. Kotera, T. Takeshita, S. Uozumi, D. Jeans, M. Götze, J. Sauer, S. Weber, C. Zeitnitz
We investigate the three dimensional substructure of hadronic showers in the CALICE scintillator-steel hadronic calorimeter. The high granularity of the detector is used to find track segments of minimum ionising particles within hadronic showers, providing sensitivity to the spatial structure and the details of secondary particle production in hadronic cascades. The multiplicity, length and angular distribution of identified track segments are compared to GEANT4 simulations with several different shower models. Track segments also provide the possibility for in-situ calibration of highly granular calorimeters.