0.8 1 1.2 1.4 0.08 0.09 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Electrons LHC ( s=7 TeV) 3 , g’$_{1}$=0.08 5 , g’$_{1}$=0.08 5 , g’$_{1}$=0.1 3 , g’$_{1}$=0.1 5 , g’$_{1}$=0.158 3 , g’$_{1}$=0.158 M$_{Z’}$ (TeV) Int. Lum. (fb −1 ) (a) 6 7 8 9 10 11 12 0.75 0.8 0.85 0.9 0.95 Electrons Tevatron ( s=1.96 TeV) 5 , g’$_{1}$=0.1 3 , g’$_{1}$=0.1 5 , g’$_{1}$=0.08 3 , g’$_{1}$=0.08 M$_{Z’}$ (TeV) Int. Lum. (fb −1 ) (b) 0.8 1 1.2 1.4 0.08 0.09 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Muons LHC ( s=7 TeV) 3 , g’$_{1}$=0.08 5 , g’$_{1}$=0.08 5 , g’$_{1}$=0.1 3 , g’$_{1}$=0.1 5 , g’$_{1}$=0.158 3 , g’$_{1}$=0.158 M$_{Z’}$ (TeV) Int. Lum. (fb −1 ) (c) FIG. 4: Integrated luminosity required for observation at 3 σ and 5 σ vs. M$_{Z}$ ′ for selected values of g ′ 1 at the LHC for √$_{s}$ = 7 TeV for (4a) electrons and (4c) muons and at the $_{Tevatron (}$√$_{s}$ = 1 . 96 TeV) for (4b) electrons (muons require more than 10 fb − 1 and is, hence, not shown). Only allowed combinations of masses and couplings are shown. TeV and 1 . 20(1 . 50) TeV at 5(3) σ , using electrons and muons, respectively. For √$_{s}$ = 10 TeV the heaviest observable Z ′ B − L boson is for M$_{Z}$ ′ = 1 . 8(2 . 4) TeV and M$_{Z}$ ′ = 1 . 7(2 . 3) 15