Phenomenology of the $B - 3 L_τ$ Gauge Boson

Abstract

Assuming the existence of a gauge boson $X$ which couples to $B - 3 L_τ$, we discuss the present experimental constraints on $g_X$ and $m_X$ from $Z \to l^+ l^-$ and $Z \to \bar f f X~(f = q, ν_τ, τ)$. We also discuss the discovery potential of $X$ at hadron colliders through its decay into $τ^+ τ^-$ pairs. In the scenario where all three charged leptons (and their neutrinos) mix, lepton flavor nonconservation through $X$ becomes possible and provides another experimental probe into this hypothesis.