Like-sign dilepton signals from a leptophobic Z' boson

Abstract

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.

19 pages, 11 PS figures. Paper significantly enlarged to include analysis for LHC

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• The Hunt for New Physics at the Large Hadron Collider
• Signatures for right-handed neutrinos at the Large Hadron Collider
• Discovering Technicolor
• Is charged lepton flavour violation a high energy phenomenon?
• Heavy lepton pair production at LHC: model discrimination with multi-lepton signals
• Flavour in heavy neutrino searches at the LHC
• Measuring heavy neutrino couplings at the LHC
• A closer look at the possible CMS signal of a new gauge boson
• Fourth Lepton Family is Natural in Technicolor
• B_s^0-\bar{B}_s^0 mixing and B -> πK decays in stringy leptophobic Z^\prime
• Flavoured searches for type-III seesaw at the LHC
• Impact of extra particles on indirect Z' limits
• Combined analysis of Z' -> t tbar and Z' -> t tbar j production for vector resonance searches at LHC
• One-loop contribution to the neutrino mass matrix in NMSSM with right-handed neutrinos and tri-bimaximal mixing
• Anomaly-free constraints in neutrino seesaw models
• Higgs bosons of a supersymmetric $U(1{)}^{\prime }$ model at the ILC
• Neutrino physics beyond neutrino masses
• Observing CP-violating Higgs Signals with Heavy Majorana Neutrinos