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A new leptophobic neutral gauge boson Z' with small mixing to the Z can havea mass as light as M_Z' ~ 350 GeV, and still have escaped detection at LEP andTevatron. Such a Z' boson can be derived from E6 and, if the new heavy neutrinosinglets in the 27 representation are lighter than M_Z'/2, the process pp(pbar) -> Z' -> NN -> l+- l+- X is observable. Indeed, this new signal couldexplain the small excess of like-sign dileptons found at Tevatron. Implicationsfor LHC are also discussed. In particular, the Tevatron excess could beconfirmed with less than 1 fb-1, and leptophobic Z' masses up to 2.5 TeV can beprobed with 30 fb-1.

Like-sign dilepton signals from a leptophobic Z' boson