3 ,  s=14 TeV, L=10fb -1 Electrons M$_{e}$+$_{e}$- (TeV) d /dM e + e - (pb/15 GeV) 10 -7 10 -6 10 -5 10 -4 10 -3 10 -2 0.5 1 1.5 2 2.5 3 3.5 4 (a) 5 ,  s=14 TeV, L=10fb -1 Electrons M$_{e}$+$_{e}$- (TeV) d /dM e + e - (pb/15 GeV) 10 -7 10 -6 10 -5 10 -4 10 -3 10 -2 0.5 1 1.5 2 2.5 3 3.5 4 (b) FIG. 10: dσ dM $_{ll}$( pp → γ, Z, Z ′ B − L → e $^{+}$e $^{−}$) for several masses and couplings ( M$_{Z}$ ′ / TeV, g ′ $_{1}$, Γ$_{Z}$ ′ /GeV ): (10a) ( 0 . 6 , 0 . 0075 , 0 . 006 ), ( 1 . 1 , 0 . 015 , 0 . 05 ), ( 1 . 6 , 0 . 025 , 0 . 21 ), ( 2 . 0 , 0 . 04 , 0 . 67 ), ( 2 . 6 , 0 . 07 , 2 . 7 ) and ( 3 . 6 , 0 . 2 , 31 ); (10b) ( 0 . 6 , 0 . 009 , 0 . 009 ), ( 1 . 1 , 0 . 02 , 0 . 09 ), ( 1 . 6 , 0 . 04 , 0 . 53 ), ( 2 . 1 , 0 . 07 , 2 . 2 ), ( 2 . 6 , 0 . 12 , 7 . 9 ) and ( 3 . 4 , 0 . 3 , 61 ), from the 3 σ and 5 σ lines at 10 fb − 1 $_{of figure 8 (}$√$_{s}$ = 14 TeV), respectively, using 15 GeV binning. Notice that the asymmetry of the peaks is the result of our choice to consider the full interference structure. 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 23