content_image/349521.jpg
<img src='content_image/349521.jpg'>

lower mass region. In particular, using electrons and in case of no evidence at the Tevatron with 10 fb − $^{1}$, the Z ′ B − L boson can be excluded for values of the coupling down to 0 . 03 (0 . 04 for muons) for M$_{Z}$ ′ = 600 GeV. For the LHC to set the same exclusion limit for the same mass, 1 fb − 1 of integrated luminosity is required, allowing to exclude g ′ 1 > 0 . 02(0 . 35) using electron(muons) in the final state. For the same integrated luminosity, the LHC has much more scope in excluding a Z ′ B − $_{L}$, for M$_{Z}$ ′ > 1 . 0 TeV. 

For a coupling of 0 . 1, the Z ′ B − L boson can be excluded up to 1 . 40(1 . 25) TeV at the LHC considering electrons(muons) for 1 fb − $^{1}$, and up to 1 . 0(0 . 9) TeV at the Tevatron for 10 fb − 1 of data. For g ′ 1 = 0 . 05, the LHC when looking at muons(electrons) will require 400(100) pb − 1 to start improving the current available limits, while with 100 pb − 1 it can set limits on g ′ 1 = 0 . 158, out of the reach of Tevatron. It will ultimately be able to exclude Z ′ B − L boson up to M$_{Z}$ ′ = 1 . 6 TeV for 1 fb − 1 (both with electrons and muons). 

The 95% C.L. exclusions for the LHC at √$_{s}$ = 7 TeV and at the Tevatron are summarised 

