Right-handed Neutral Currents, Families and the LEP $l^{+}{l}^{-}\gamma \gamma$ Events

Abstract

We explore the possibility of having new physics which could account for the $l^{+}{l}^{-}\gamma \gamma$ events with $M_{\gamma \gamma }\simeq 60$GeV recently reported by LEP. We consider models which contain an extra neutral gauge boson ($Z^{\prime }$) 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 ${\ell }^{+}{\ell }^{-}\gamma \gamma$ events at a rate similar to that observed at LEP.

Comments: 11 pages (LaTex file), IS-J 4917