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cross sections) for selected benchmark points on the 3 σ and 5 σ lines for 10 fb − 1 of data at √$_{s}$ = 14 TeV, plotting the dilepton invariant mass to which just the cuts of eq. (10) have been applied (without selecting any mass window). 

The improved resolution for electrons allows a measure of the Z ′ B − L boson width not only at high masses, but also opens the possibility of a measurement even for smaller masses as compared to the √$_{s}$ = 10 TeV setup. 

## V. Z ′ SECTOR: EXCLUSION POWER 

If no evidence for a signal is found at the LHC at any energy and luminosity configu- rations, 95% C.L. exclusion limits can be derived: in the following subsections we present exclusion plots for each stage of the LHC CM energy. We also show the expected exclusions at the Tevatron for ∫ L = 10 fb − $^{1}$. 

## A. LHC at √ s = 7 TeV 

We start by looking at the 95% C.L. limits presented in figure 12 for the Tevatron and for this stage of the LHC (for 10 fb − 1 and 1 fb − 1 of integrated luminosity, respectively). 

One can see that the different resolutions imply that the limits derived using electrons are always more stringent than those derived using muons in excluding the Z ′ B − L boson. As for the discovery reach, the Tevatron is also competitive in setting limits, especially in the 

