Like-sign dilepton signals from a leptophobic Z' boson
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DileptonLHC (Large Hadron Collider)Tevatron
Águila, F.; Aguilar-Saavedra, J.A. Like-sign dilepton signals from a leptophobic Z' boson. Journal of High Energy Physics, 11: 072 (2007). [http://hdl.handle.net/10481/30597]
PatrocinadorThis work has been supported by MEC project FPA2006-05294 and Junta de Andalucía projects FQM 101 and FQM 437. J.A.A.-S. acknowledges support by a MEC Ram´on y Cajal contract.
A new leptophobic neutral gauge boson Z' with small mixing to the Z can have a mass as light as M_Z' ~ 350 GeV, and still have escaped detection at LEP and Tevatron. Such a Z' boson can be derived from E6 and, if the new heavy neutrino singlets in the 27 representation are lighter than M_Z'/2, the process p p(pbar) -> Z' -> NN -> l+- l+- X is observable. Indeed, this new signal could explain the small excess of like-sign dileptons found at Tevatron. Implications for LHC are also discussed. In particular, the Tevatron excess could be confirmed with less than 1 fb-1, and leptophobic Z' masses up to 2.5 TeV can be probed with 30 fb-1.