better resolution, the bounds from electrons will be more stringent than those from muons, especially at smaller masses. While this work was in progress, other papers dealing with the discovery power at the LHC for the Z ′ B − L boson appeared, for CM energies of 7, 10 [15] and 14 TeV [14], as well as for other popular Z ′ boson models. Our results broadly agree with those therein. LB thanks Muge Karagoz Unel and Ian Tomalin for useful discussions. SM is financially supported in part by the scheme ‘Visiting Professor - Azione D - Atto Integrativo tra la Regione Piemonte e gli Atenei Piemontesi’. We thank the NExT Institute for financial support. ACKNOWLEDGEMENTS [1] G.L. Fogli, E. Lisi, A. Marrone and A. Palazzo, Prog. Part. Nucl. Phys. 57 (2006) 742; G.L. Fogli et al. , Phys. Rev. D 75 (2007) 053001. [2] M. Carena, A. Daleo, B.A. Dobrescu and T.M.P. Tait, Phys. Rev. D 70 (2004) 093009. [3] G. Cacciapaglia, C. Csaki, G. Marandella and A. Strumia, Phys. Rev. D 74 (2006) 033011. [4] V. M. Abazov et al. [D0 Collaboration], Phys. Lett. B 695 (2011) 88 [arXiv:1008.2023 [hep- ex]]. [5] T. Aaltonen et al. [The CDF Collaboration], Phys. Rev. Lett. 106 (2011) 121801 [arXiv:1101.4578 [hep-ex]]. [6] http://www-d0.fnal.gov/Run2Physics/WWW/results/prelim/NP/N66/ [7] E. E. Jenkins, Phys. Lett. B 192 (1987) 219; W. Buchmuller, C. Greub and P. Minkowski, Phys. Lett. B 267 (1991) 395; S. Khalil, J. Phys. G 35 (2008) 055001. [8] L. Basso, A minimal extension of the Standard Model with B − L gauge symmetry , (Master The- sis, Universit` a degli Studi di Padova, 2007), at http://www.hep.phys.soton.ac.uk/ ∼ l.basso/B- L Master Thesis.pdf. [9] P. Minkowski, Phys. Lett. B 67 (1977) 421; M. Gell-Mann, P. Ramond and R. Slansky, in Supergravity , eds. P. Van Nieuwenhuizen and D. Freedman (North-Holland, Amsterdam, 1979), p. 315; T. Yanagida, in Proceedings of the Workshop on the Unified Theory and the 31