Prominent Decay Modes of a Leptophobic Z'

Abstract

An anomaly-free U(1) charge $Q^{\prime }$ has recently been identified within the group E${}_6$ for which the familiar leptons (the left- and right-handed electron and the left-handed neutrino) have $Q^{\prime }=0$. It is pointed out that the $Q^{\prime }$ charges of several {\it exotic} leptons within E${}_6$ matter multiplets are quite large, leading to the prediction that half of the decays of the so-called ``leptophobic'' $Z^{\prime }$ bosons coupling to $Q^{\prime }$ are to these exotic leptons. Other large $Q^{\prime }$ charges include those of standard up-type quarks and exotic down-type quarks. Substantial forward-backward asymmetries are expected in $u\bar{u}\to Z^{\prime }\to f\bar{f}$ channels when $f$ is a standard up-type quark, an exotic down-type quark, or an exotic lepton.

Comments: 7 pages, latex, no figures. Version to be published in Phys. Lett B