The active muon shield in the SHiP experiment (1703.03612)
SHiP collaboration: A. Akmete, A. Alexandrov, A. Anokhina, S. Aoki, E. Atkin, N. Azorskiy, J.J. Back, A. Bagulya, A. Baranov, G.J. Barker, A. Bay, V. Bayliss, G. Bencivenni, A.Y. Berdnikov, Y.A. Berdnikov, M. Bertani, C. Betancourt, I. Bezshyiko, O. Bezshyyko, D. Bick, S. Bieschke, A. Blanco, J. Boehm, M. Bogomilov, K. Bondarenko, W.M. Bonivento, A. Boyarsky, R. Brenner, D. Breton, R. Brundler, M. Bruschi, V. Büscher, A. Buonaura, S. Buontempo, S. Cadeddu, A. Calcaterra, M. Campanelli, J. Chauveau, A. Chepurnov, M. Chernyavsky, K.-Y. Choi, A. Chumakov, P. Ciambrone, G.M. Dallavalle, N. D'Ambrosio, G. D'Appollonio, G. De Lellis, A. De Roeck, M. De Serio, L. Dedenko, A. Di Crescenzo, N. Di Marco, C. Dib, H. Dijkstra, V. Dmitrenko, D. Domenici, S. Donskov, A. Dubreuil, J. Ebert, T. Enik, A. Etenko, F. Fabbri, L. Fabbri, O. Fedin, G. Fedorova, G. Felici, M. Ferro-Luzzi, R.A. Fini, P. Fonte, C. Franco, T. Fukuda, G. Galati, G. Gavrilov, S. Gerlach, L. Golinka-Bezshyyko, D. Golubkov, A. Golutvin, D. Gorbunov, S. Gorbunov, V. Gorkavenko, Y. Gornushkin, M. Gorshenkov, V. Grachev, E. Graverini, V. Grichine, A. M. Guler, Yu. Guz, C. Hagner, H. Hakobyan, E. van Herwijnen, A. Hollnagel, B. Hosseini, M. Hushchyn, G. Iaselli, A. Iuliano, R. Jacobsson, M. Jonker, I. Kadenko, C. Kamiscioglu, M. Kamiscioglu, M. Khabibullin, G. Khaustov, A. Khotyantsev, S.H. Kim, V. Kim, Y.G. Kim, N. Kitagawa, J.-W. Ko, K. Kodama, A. Kolesnikov, D.I. Kolev, V. Kolosov, M. Komatsu, N. Konovalova, M.A. Korkmaz, I. Korol, I. Korol'ko, A. Korzenev, S. Kovalenko, I. Krasilnikova, K. Krivova, Y. Kudenko, V. Kurochka, E. Kuznetsova, H.M. Lacker, A. Lai, G. Lanfranchi, O. Lantwin, A. Lauria, H. Lebbolo, K.Y. Lee, J.-M. Lévy, V. Likacheva, L. Lopes, V. Lyubovitskij, J. Maalmi, A. Magnan, V. Maleev, A. Malinin, A. Mefodev, P. Mermod, S. Mikado, Yu. Mikhaylov, D.A. Milstead, O. Mineev, A. Montanari, M.C. Montesi, K. Morishima, S. Movchan, N. Naganawa, M. Nakamura, T. Nakano, A. Novikov, B. Obinyakov, S. Ogawa, N. Okateva, P.H. Owen, A. Paoloni, B.D. Park, L. Paparella, A. Pastore, M. Patel, D. Pereyma, D. Petrenko, K. Petridis, D. Podgrudkov, V. Poliakov, N. Polukhina, M. Prokudin, A. Prota, A. Rademakers, F. Ratnikov, T. Rawlings, M. Razeti, F. Redi, S. Ricciardi, T. Roganova, A. Rogozhnikov, H. Rokujo, G. Rosa, T. Rovelli, O. Ruchayskiy, T. Ruf, V. Samoylenko, A. Saputi, O. Sato, E.S. Savchenko, W. Schmidt-Parzefall, N. Serra, A. Shakin, M. Shaposhnikov, P. Shatalov, T. Shchedrina, L. Shchutska, V. Shevchenko, H. Shibuya, A. Shustov, S.B. Silverstein, S. Simone, M. Skorokhvatov, S. Smirnov, J.Y. Sohn, A. Sokolenko, N. Starkov, B. Storaci, P. Strolin, S. Takahashi, I. Timiryasov, V. Tioukov, N. Tosi, D. Treille, R. Tsenov, S. Ulin, A. Ustyuzhanin, Z. Uteshev, G. Vankova-Kirilova, F. Vannucci, P. Venkova, S. Vilchinski, M. Villa, K. Vlasik, A. Volkov, R. Voronkov, R. Wanke, J.-K. Woo, M. Wurm, S. Xella, D. Yilmaz, A.U. Yilmazer, C.S. Yoon, Yu. Zaytsev
May 18, 2017 hep-ex, physics.ins-det
The SHiP experiment is designed to search for very weakly interacting particles beyond the Standard Model which are produced in a 400 GeV/c proton beam dump at the CERN SPS. An essential task for the experiment is to keep the Standard Model background level to less than 0.1 event after $2\times 10^{20}$ protons on target. In the beam dump, around $10^{11}$ muons will be produced per second. The muon rate in the spectrometer has to be reduced by at least four orders of magnitude to avoid muon-induced combinatorial background. A novel active muon shield is used to magnetically deflect the muons out of the acceptance of the spectrometer. This paper describes the basic principle of such a shield, its optimization and its performance.
Search for Sterile Neutrinos in the Muon Neutrino Disappearance Mode at FNAL (1503.07471)
A. Anokhina, A. Bagulya, M. Benettoni, P. Bernardini, R. Brugnera, M. Calabrese, A. Cecchetti, S. Cecchini, M. Chernyavskiy, F. Dal Corso, O. Dalkarov, A. Del Prete, G. De Robertis, M. De Serio, D. Di Ferdinando, S. Dusini, T. Dzhatdoev, R. A. Fini, G. Fiore, A. Garfagnini, M. Guerzoni, B. Klicek, U. Kose, K. Jakovcic, G. Laurenti, I. Lippi, F. Loddo, A. Longhin, M. Malenica, G. Mancarella, G. Mandrioli, A. Margiotta, G. Marsell, N. Mauri, E. Medinaceli, R. Mingazheva, O. Morgunova, M. T. Muciaccia, M. Nessi, D. Orecchini, A. Paoloni, G. Papadia, L. Paparella, L. Pasqualini, A. Pastore, L. Patrizii, N. Polukhina, M. Pozzato, M. Roda, T. Roganova, G. Rosa, Z. Sahnoun, T. Shchedrina, S. Simone, C. Sirignano, G. Sirri, M. Spurio, L. Stanco, N. Starkov, M. Stipcevic, A. Surdo, M. Tenti, V. Togo, M. Vladymyrov
Feb. 2, 2017 hep-ph, hep-ex, physics.ins-det
The NESSiE Collaboration has been setup to undertake a conclusive experiment to clarify the {\em muon--neutrino disappearance} measurements at short baselines in order to put severe constraints to models with more than the three--standard neutrinos. To this aim the current FNAL--Booster neutrino beam for a Short--Baseline experiment was carefully evaluated by considering the use of magnetic spectrometers at two sites, near and far ones. The detector locations were studied, together with the achievable performances of two OPERA--like spectrometers. The study was constrained by the availability of existing hardware and a time--schedule compatible with the undergoing project of multi--site Liquid--Argon detectors at FNAL. The settled physics case and the kind of proposed experiment on the Booster neutrino beam would definitively clarify the existing tension between the $\nu_{\mu}$ disappearance and the $\nu_e$ appearance/disappearance at the eV mass scale. In the context of neutrino oscillations the measurement of $\nu_{\mu}$ disappearance is a robust and fast approach to either reject or discover new neutrino states at the eV mass scale. We discuss an experimental program able to extend by more than one order of magnitude (for neutrino disappearance) and by almost one order of magnitude (for antineutrino disappearance) the present range of sensitivity for the mixing angle between standard and sterile neutrinos. These extensions are larger than those achieved in any other proposal presented so far.
A facility to Search for Hidden Particles (SHiP) at the CERN SPS (1504.04956)
SHiP Collaboration: M. Anelli, S. Aoki, G. Arduini, J.J. Back, A. Bagulya, W. Baldini, A. Baranov, G.J. Barker, S. Barsuk, M. Battistin, J. Bauche, A. Bay, V. Bayliss, L. Bellagamba, G. Bencivenni, M. Bertani, O. Bezshyyko, D. Bick, N. Bingefors, A. Blondel, M. Bogomilov, A. Boyarsky, D. Bonacorsi, D. Bondarenko, W. Bonivento, J. Borburgh, T. Bradshaw, R. Brenner, D. Breton, N. Brook, M. Bruschi, A. Buonaura, S. Buontempo, S. Cadeddu, A. Calcaterra, M. Calviani, M. Campanelli, C. Capoccia, A. Cecchetti, A. Chatterjee, J. Chauveau, A. Chepurnov, M. Chernyavskiy, P. Ciambrone, C. Cicalo, G. Conti, K. Cornelis, M. Courthold, M. G. Dallavalle, N. D'Ambrosio, G. De Lellis, M. De Serio, L. Dedenko, A. Di Crescenzo, N. Di Marco, C. Dib, J. Dietrich, H. Dijkstra, D. Domenici, S. Donskov, D. Druzhkin, J. Ebert, U. Egede, A. Egorov, V. Egorychev, M.A. El Alaoui, T. Enik, A. Etenko, F. Fabbri, L. Fabbri, G. Fedorova, G. Felici, M. Ferro-Luzzi, R.A. Fini, M. Franke, M. Fraser, G. Galati, B. Giacobbe, B. Goddard, L. Golinka-Bezshyyko, D. Golubkov, A. Golutvin, D. Gorbunov, E. Graverini, J-L Grenard, A.M. Guler, C. Hagner, H. Hakobyan, J.C. Helo, E. van Herwijnen, D. Horvath, M. Iacovacci, G. Iaselli, R. Jacobsson, I. Kadenko, M. Kamiscioglu, C. Kamiscioglu, G. Khaustov, A. Khotjansev, B. Kilminster, V. Kim, N. Kitagawa, K. Kodama, A. Kolesnikov, D. Kolev, M. Komatsu, N. Konovalova, S. Koretskiy, I. Korolko, A. Korzenev, S. Kovalenko, Y. Kudenko, E. Kuznetsova, H. Lacker, A. Lai, G. Lanfranchi, A. Lauria, H. Lebbolo, J.-M. Levy, L. Lista, P. Loverre, A. Lukiashin, V.E. Lyubovitskij, A. Malinin, M. Manfredi, A. Perillo-Marcone, A. Marrone, R. Matev, E.N. Messomo, P. Mermod, S. Mikado, Yu. Mikhaylov, J. Miller, D. Milstead, O. Mineev, R. Mingazheva, G. Mitselmakher, M. Miyanishi, P. Monacelli, A. Montanari, M.C. Montesi, G. Morello, K. Morishima, S. Movtchan, V. Murzin, N. Naganawa, T. Naka, M. Nakamura, T. Nakano, N. Nurakhov, B. Obinyakov, K. Ocalan, S. Ogawa, V. Oreshkin, A. Orlov, J. Osborne, P. Pacholek, J. Panman, A. Paoloni, L. Paparella, A. Pastore, M. Patel, K. Petridis, M. Petrushin, M. Poli-Lener, N. Polukhina, V. Polyakov, M. Prokudin, G. Puddu, F. Pupilli, F. Rademakers, A. Rakai, T. Rawlings, F. Redi, S. Ricciardi, R. Rinaldesi, T. Roganova, A. Rogozhnikov, H. Rokujo, A. Romaniouk, G. Rosa, I. Rostovtseva, T. Rovelli, O. Ruchayskiy, T. Ruf, G. Saitta, V. Samoylenko, V. Samsonov, A. Sanz Ull, A. Saputi, O. Sato, W. Schmidt-Parzefall, N. Serra, S. Sgobba, M. Shaposhnikov, P. Shatalov, A. Shaykhiev, L. Shchutska, V. Shevchenko, H. Shibuya, Y. Shitov, S. Silverstein, S. Simone, M. Skorokhvatov, S. Smirnov, E. Solodko, V. Sosnovtsev, R. Spighi, M. Spinetti, N. Starkov, B. Storaci, C. Strabel, P. Strolin, S. Takahashi, P. Teterin, V. Tioukov, D. Tommasini, D. Treille, R. Tsenov, T. Tshchedrina, A. Ustyuzhanin, F. Vannucci, V. Venturi, M. Villa, Heinz Vincke, Helmut Vincke, M. Vladymyrov, S. Xella, M. Yalvac, N. Yershov, D. Yilmaz, A. U. Yilmazer, G. Vankova-Kirilova, Y. Zaitsev, A. Zoccoli
April 20, 2015 hep-ex, physics.ins-det
A new general purpose fixed target facility is proposed at the CERN SPS accelerator which is aimed at exploring the domain of hidden particles and make measurements with tau neutrinos. Hidden particles are predicted by a large number of models beyond the Standard Model. The high intensity of the SPS 400~GeV beam allows probing a wide variety of models containing light long-lived exotic particles with masses below ${\cal O}$(10)~GeV/c$^2$, including very weakly interacting low-energy SUSY states. The experimental programme of the proposed facility is capable of being extended in the future, e.g. to include direct searches for Dark Matter and Lepton Flavour Violation.
The NESSiE way to searches for sterile neutrinos at FNAL (1410.3980)
L. Stanco, A. Anokhina, A. Bagulya, M. Benettoni, P. Bernardini, R. Brugnera, M. Calabrese, A. Cecchetti, S. Cecchini, M. Chernyavskiy, P. Creti, F. Dal Corso, O. Dalkarov, A. Del Prete, G. De Robertis, M. De Serio, L. Degli Esposti, D. Di Ferdinando, S. Dusini, T. Dzhatdoev, C. Fanin, R. A. Fini, G. Fiore, A. Garfagnini, S. Golovanov, M. Guerzoni, B. Klicek, U. Kose, K. Jakovcic, G. Laurenti, I. Lippi, F. Loddo, A. Longhin, M. Malenica, G. Mancarella, G. Mandriol, A. Margiotta, G. Marsella, N. Mauri, E. Medinaceli, A. Mengucci, R. Mingazheva, O. Morgunova, M. T. Muciaccia, M. Nessi, D. Orecchini, A. Paoloni, G. Papadia, L. Paparella, L. Pasqualini, A. Pastore, L. Patrizii, N. Polukhina, M. Pozzato, M. Roda, T. Roganova, G. Rosa, Z. Sahnoun, S. Simone, C. Sirignano, G. Sirri, M. Spurio, N. Starkov, M. Stipcevic, A. Surdo, M. Tenti, V. Togo, M. Ventura, M. Vladymyrov
Oct. 15, 2014 hep-ph, hep-ex, physics.ins-det
Neutrino physics is nowadays receiving more and more attention as a possible source of information for the long-standing problem of new physics beyond the Standard Model. The recent measurement of the mixing angle $\theta_{13}$ in the standard mixing oscillation scenario encourages us to pursue the still missing results on leptonic CP violation and absolute neutrino masses. However, puzzling measurements exist that deserve an exhaustive evaluation. The NESSiE Collaboration has been setup to undertake conclusive experiments to clarify the muon-neutrino disappearance measurements at small $L/E$, which will be able to put severe constraints to models with more than the three-standard neutrinos, or even to robustly measure the presence of a new kind of neutrino oscillation for the first time. To this aim the use of the current FNAL-Booster neutrino beam for a Short-Baseline experiment has been carefully evaluated. Its recent proposal refers to the use of magnetic spectrometers at two different sites, Near and Far ones. Their positions have been extensively studied, together with the possible performances of two OPERA-like spectrometers. The proposal is constrained by availability of existing hardware and a time-schedule compatible with the undergoing project of a multi-site Liquid-Argon detectors at FNAL. The experiment to be possibly setup at Booster will allow to definitively clarify the current $\nu_{\mu}$ disappearance tension with $\nu_{e}$ appearance and disappearance at the eV mass scale.
Prospects for the measurement of muon-neutrino disappearance at the FNAL-Booster (1404.2521)
A. Anokhina, A. Bagulya, M. Benettoni, P. Bernardini, R. Brugnera, M. Calabrese, A. Cecchetti, S. Cecchini, M. Chernyavskiy, P. Creti, F. Dal Corso, O. Dalkarov, A. Del Prete, G. De Robertis, M. De Serio, L. Degli Esposti, D. Di Ferdinando, S. Dusini, T. Dzhatdoev, C. Fanin, R. A. Fini, G. Fiore, A. Garfagnini, S. Golovanov, M. Guerzoni, B. Klicek, U. Kose, K. Jakovcic, G. Laurent, I. Lippi, F. Loddo, A. Longhin, M. Malenica, G. Mancarella, G. Mandrioli, A. Margiotta, G. Marsella, N. Mauri, E. Medinaceli, A. Mengucci, R. Mingazheva, O. Morgunova, M. T. Muciaccia, M. Nessi, D. Orecchini, A. Paoloni, G. Papadia, L. Paparella, L. Pasqualini, A. Pastore, L. Patrizii, N. Polukhina, M. Pozzato, M. Roda, T. Roganova, G. Rosa, Z. Sahnoun, S. Simone, C. Sirignano, G. Sirri, M. Spurio, L. Stanco, N. Starkov, M. Stipcevic, A. Surdo, M. Tenti, V. Togo, M. Ventura, M. Vladymyrov
April 9, 2014 hep-ph, hep-ex, physics.ins-det
Neutrino physics is nowadays receiving more and more attention as a possible source of information for the long-standing problem of new physics beyond the Standard Model. The recent measurement of the mixing angle $\theta_{13}$ in the standard mixing oscillation scenario encourages us to pursue the still missing results on leptonic CP violation and absolute neutrino masses. However, puzzling measurements exist that deserve an exhaustive evaluation. The NESSiE Collaboration has been setup to undertake conclusive experiments to clarify the muon-neutrino disappearance measurements at small $L/E$, which will be able to put severe constraints to models with more than the three-standard neutrinos, or even to robustly measure the presence of a new kind of neutrino oscillation for the first time. To this aim the use of the current FNAL-Booster neutrino beam for a Short-Baseline experiment has been carefully evaluated. This proposal refers to the use of magnetic spectrometers at two different sites, Near and Far. Their positions have been extensively studied, together with the possible performances of two OPERA-like spectrometers. The proposal is constrained by availability of existing hardware and a time-schedule compatible with the CERN project for a new more performant neutrino beam, which will nicely extend the physics results achievable at the Booster. The possible FNAL experiment will allow to clarify the current $\nu_{\mu}$ disappearance tension with $\nu_e$ appearance and disappearance at the eV mass scale. Instead, a new CERN neutrino beam would allow a further span in the parameter space together with a refined control of systematics and, more relevant, the measurement of the antineutrino sector, by upgrading the spectrometer with detectors currently under R&D study.
The NESSiE Concept for Sterile Neutrinos (1312.1227)
L. Stanco, A. Anokhina, A. Bagulya, M. Benettoni, P. Bernardini, A. Bertolin, R. Brugnera, M. Calabrese, A. Cecchetti, S. Cecchini, M. Chernyavskiy, G. Collazuol, P. Creti, F. Dal Corso, O. Dalkarov, A. Del Prete, I. De Mitri, G. De Robertis, M. De Serio, L. Degli Esposti, D. Di Ferdinando, U. Dore, S. Dusini, T. Dzhatdoev, C. Fanin, R. A. Fini, G. Fiore, G. Galati, A. Garfagnini, G. Giacomelli, R. Giacomelli, S. Golovanov, C. Guandalin, M. Guerzoni, B. Klicek, U. Kose, K. Jakovcic, G. Laurenti, M. Laveder, I. Lippi, F. Loddo, A. Longhin, P. Loverre, M. Malenica, G. Mancarella, G. Mandrioli, A. Margiotta, G. Marsella, N. Mauri, E. Medinaceli, A. Mengucci, M. Mezzetto, R. Michinelli, R. Mingazheva, O. Morgunova, M. T. Muciaccia, D. Orecchini, A. Paoloni, G. Papadia, L. Paparella, A. Pastore, L. Patrizii, N. Polukhina, M. Pozzato, M. Roda, T. Roganova, G. Rosa, Z. Sahnoun, S. Simone, M. Sioli, C. Sirignano, G. Sirri, M. Spurio, N. Starkov, M. Stipcevic, A. Surdo, M. Tenti, V. Togo, M. Ventura, M. Vladymyrov, M. Zago
Dec. 4, 2013 hep-ph, physics.ins-det
Neutrino physics is nowadays receiving more and more attention as a possible source of information for the long-standing problem of new physics beyond the Standard Model. The recent measurement of the third mixing angle theta13 in the standard mixing oscillation scenario encourages us to pursue the still missing results on leptonic CP violation and absolute neutrino masses. However, several puzzling measurements exist, which deserve an exhaustive evaluation. The NESSiE Collaboration has been setup to undertake a definitive experiment to clarify the muon disappearance measurements at small L/E, which will be able to put severe constraints to any model with more than the three-standard neutrinos, or even to robustly measure the presence of a new kind of neutrino oscillation for the first time. Within the context of the current CERN project, aimed to revitalize the neutrino field in Europe, we will illustrate the achievements that can be obtained by a double muon-spectrometer system, with emphasis on the search for sterile neutrinos.
Measurement of the atmospheric muon charge ratio with the OPERA detector (1003.1907)
OPERA Collaboration: N. Agafonova, A. Anokhina, S. Aoki, A. Ariga, T. Ariga, D. Autiero, A. Badertscher, A. Bagulya, A. Bertolin, M. Besnier, D. Bick, V. Boyarkin, C. Bozza, T. Brugière, R. Brugnera, G. Brunetti, S. Buontempo, A. Cazes, L. Chaussard, M. Chernyavsky, V. Chiarella, N. Chon-Sen, A. Chukanov, M. Cozzi, G. D'Amato, F. Dal Corso, N. D'Ambrosio, G. De Lellis, Y. D'eclais, M. De Serio, F. Di Capua, D. Di Ferdinando, A. Di Giovanni, N. Di Marco, S. Dmitrievski, M. Dracos, D. Duchesneau, S. Dusini, J. Ebert, O. Egorov, R. Enikeev, A. Ereditato, L. S. Esposito, J. Favier, G. Felici, T. Ferber, R. Fini, D. Frekers, T. Fukuda, C. Fukushima, V. I. Galkin, A. Garfagnini, G. Giacomelli, M. Giorgini, C. Goellnitz, J. Goldberg, D. Golubkov, L. Goncharova, Y. Gornushkin, G. Grella, F. Grianti, M. Guler, C. Gustavino, C. Hagner, K. Hamada, T. Hara, M. Hierholzer, K. Hoshino, M. Ieva, K. Jakovcic, C. Jollet, F. Juget, M. Kazuyama, S. H. Kim, M. Kimura, B. Klicek, J. Knuesel, K. Kodama, M. Komatsu, U. Kose, I. Kreslo, H. Kubota, C. Lazzaro, J. Lenkeit, A. Ljubicic, A. Longhin, G. Lutter, A. Malgin, G. Mandrioli, A. Marotta, J. Marteau, T. Matsuo, V. Matveev, N. Mauri, E. Medinaceli, F. Meisel, A. Meregaglia, P. Migliozzi, S. Mikado, S. Miyamoto, P. Monacelli, K. Morishima, U. Moser, M. T. Muciaccia, N. Naganawa, T. Naka, M. Nakamura, T. Nakano, D. Naumov, V. Nikitina, K. Niwa, Y. Nonoyama, S. Ogawa, A. Olchevski, C. Oldorf, G. Orlova, V. Osedlo, M. Paniccia, A. Paoloni, B. D. Park, I. G. Park, A. Pastore, L. Patrizii, E. Pennacchio, H. Pessard, V. Pilipenko, C. Pistillo, G. Policastro, N. Polukhina, M. Pozzato, K. Pretzl, P. Publichenko, F. Pupilli, R. Rescigno, T. Roganova, H. Rokujo, G. Romano, G. Rosa, I. Rostovtseva, A. Rubbia, A. Russo, V. Ryasny, O. Ryazhskaya, O. Sato, Y. Sato, A. Schembri, W. Schmidt Parzefall, H. Schroeder, L. Scotto Lavina, A. Sheshukov, H. Shibuya, S. Simone, M. Sioli, C. Sirignano, G. Sirri, J. S. Song, M. Spinetti, L. Stanco, N. Starkov, M. Stipcevic, T. Strauss, P. Strolin, S. Takahashi, M. Tenti, F. Terranova, I. Tezuka, V. Tioukov, P. Tolun, T. Tran, S. Tufanli, P. Vilain, M. Vladimirov, L. Votano, J. L. Vuilleumier, G. Wilquet, B. Wonsak, V. Yakushev, C. S. Yoon, T. Yoshioka, J. Yoshida, Y. Zaitsev, S. Zemskova, A. Zghiche, R. Zimmermann
March 9, 2010 hep-ex
The OPERA detector at the Gran Sasso underground laboratory (LNGS) was used to measure the atmospheric muon charge ratio in the TeV energy region. We analyzed 403069 atmospheric muons corresponding to 113.4 days of livetime during the 2008 CNGS run. We computed separately the muon charge ratio for single and for multiple muon events in order to select different energy regions of the primary cosmic ray spectrum and to test the charge ratio dependence on the primary composition. The measured charge ratio values were corrected taking into account the charge-misidentification errors. Data have also been grouped in five bins of the "vertical surface energy". A fit to a simplified model of muon production in the atmosphere allowed the determination of the pion and kaon charge ratios weighted by the cosmic ray energy spectrum.
Large-angle production of charged pions with incident pion beams on nuclear targets (0907.1428)
The HARP Collaboration: M. Apollonio, A. Artamonov, A. Bagulya, G. Barr, A. Blondel, F. Bobisut, M. Bogomilov, M. Bonesini, C. Booth, S. Borghi, S. Bunyatov, J. Burguet-Castell, M.G. Catanesi, A. Cervera-Villanueva, P. Chimenti, L. Coney, E. Di Capua, U. Dore, J. Dumarchez, R. Edgecock, M. Ellis, F. Ferri, U. Gastaldi, S. Giani, G. Giannini, D. Gibin, S. Gilardoni, P. Gorbunov, C. Goessling, J.J. Gomez-Cadenas, A. Grant, J.S. Graulich, G. Gregoire, V. Grichine, A. Grossheim, A. Guglielmi, L. Howlett, A. Ivanchenko, V. Ivanchenko, A. Kayis-Topaksu, M. Kirsanov, D. Kolev, A. Krasnoperov, J. Martin-Albo, C. Meurer, M. Mezzetto, G. B. Mills, M.C. Morone, P. Novella, D. Orestano, V. Palladino, J. Panman, I. Papadopoulos, F. Pastore, S. Piperov, N. Polukhina, B. Popov, G. Prior, E. Radicioni, D. Schmitz, R. Schroeter, G. Skoro, M. Sorel, E. Tcherniaev, P. Temnikov, V. Tereschenko, A. Tonazzo, L. Tortora, R. Tsenov, I. Tsukerman, G. Vidal-Sitjes, C. Wiebusch, P. Zucchelli
Jan. 1, 2010 hep-ex
Measurements of the double-differential pi+/- production cross-section in the range of momentum 100 MeV/c <= p <= 800 MeV/c and angle 0.35 rad <= theta <= 2.15 rad using pi+/- beams incident on beryllium, aluminium, carbon, copper, tin, tantalum and lead targets are presented. The data were taken with the large acceptance HARP detector in the T9 beam line of the CERN Proton Synchrotron. The secondary pions were produced by beams in a momentum range from 3 GeV/c to 12.9 GeV/c hitting a solid target with a thickness of 5% of a nuclear interaction length. The tracking and identification of the produced particles was performed using a small-radius cylindrical time projection chamber (TPC) placed inside a solenoidal magnet. Incident particles were identified by an elaborate system of beam detectors. Results are obtained for the double-differential cross-sections d2sigma/dpdtheta at six incident beam momenta. Data at 3 GeV/c, 5 GeV/c, 8 GeV/c, and 12 GeV/c are available for all targets while additional data at 8.9 GeV/c and 12.9 GeV/c were taken in positive particle beams on Be and Al targets, respectively. The measurements are compared with several generators of GEANT4 and the MARS Monte Carlo simulation.
Comparison of large-angle production of charged pions with incident protons on cylindrical long and short targets (0909.0337)
Dec. 23, 2009 hep-ex
The HARP collaboration has presented measurements of the double-differential pi+/pi- production cross-section in the range of momentum 100 MeV/c <= p 800 MeV/c and angle 0.35 rad <= theta <= 2.15 rad with proton beams hitting thin nuclear targets. In many applications the extrapolation to long targets is necessary. In this paper the analysis of data taken with long (one interaction length) solid cylindrical targets made of carbon, tantalum and lead is presented. The data were taken with the large acceptance HARP detector in the T9 beam line of the CERN PS. The secondary pions were produced by beams of protons with momenta 5 GeV/c, 8 GeV/c and 12 GeV/c. The tracking and identification of the produced particles were performed using a small-radius cylindrical time projection chamber (TPC) placed inside a solenoidal magnet. Incident protons were identified by an elaborate system of beam detectors. Results are obtained for the double-differential yields per target nucleon d2 sigma / dp dtheta. The measurements are compared with predictions of the MARS and GEANT4 Monte Carlo simulations.
Dynamic Distortions in the HARP TPC: observations, measurements, modelling and corrections (0903.4762)
A. Bagulya, A. Blondel, S. Borghi, G. Catanesi, P. Chimenti, U. Gastaldi, S. Giani, V. Grichine, V. Ivanchenko, D. Kolev, J. Panman, E. Radicioni, R. Tsenov, I. Tsukerman
March 27, 2009 physics.ins-det
The HARP experiment was designed to study hadron production in proton- nucleus collisions in the energy range of 1.5 GeV/c-15 GeV/c. The experiment was made of two spectrometers, a forward dipole spectrometer and a large-angle solenoid spectrometer. In the large-angle spectrometer the main tracking and particle identification is performed by a cylindrical Time Projection Chamber (TPC) which suffered a number of shortcomings later addressed in the analysis. In this paper we discuss the effects of time-dependent (dynamic) distortions of the position measurements in the TPC which are due to a build-up of ion charges in the chamber during the accelerator spill. These phenomena have been studied both theoretically and experimentally, and a correction procedure has been developed. First, the dynamics of the positive ion cloud and of the full electrostatics of the field-cage system have been modelled with a phenomenological approach and a general correction procedure has been developed and applied to all data settings. Then, the correction procedure has been benchmarked experimentally by means of recoil protons in elastic scattering reactions, where the track coordinates are precisely predictable from simple kinematical considerations. After application of the corrections for dynamic distortions the corrected data have a performance equal to data where the dynamic distortions are absent. We describe the theoretical model, the comparison with the measurements, the distortion correction method and the results obtained with experimental data.