Right-handed Neutral Currents, Families and the LEP $l^+l^-γγ$ Events

Abstract

We explore the possibility of having new physics which could account for the $l^+l^-γγ$ events with $M_{γγ}\simeq 60\ $GeV recently reported by LEP. We consider models which contain an extra neutral gauge boson ($Z'$) that couples only to right-handed fermions. The models naturally require at least three quark and lepton families from anomaly cancellation. We find simple realizations of such models that have $\ell^+\ell^-γγ$ events at a rate similar to that observed at LEP.