Decays Z' -> \gamma\gamma\gamma{} and Z -> \gamma\gamma\gamma{} in the minimal 331 model

TL;DR

This paper explores how exotic particles in the minimal 331 model could significantly enhance the decay rates of Z' and Z bosons into three photons, with potential observable effects for Z' decays.

Contribution

It demonstrates that exotic particles in the minimal 331 model can increase the Z' decay into three photons by three orders of magnitude compared to the Z decay.

Findings

Z'->gammagamma decay branching ratio  10^{-6}

Standard model prediction for Z->gammagamma remains unchanged

Exotic particles significantly enhance Z' decay width

Abstract

The possibility of a significant effect of exotic particles on the Z'->\gamma\gamma\gamma{} and Z->\gamma\gamma\gamma{} decays is investigated in the context of the minimal 331 model. This model, which is based in the SU_C(3)xSU_L(3)xU_X(1) gauge group, predicts the existence of many exotic charged particles that can significantly enhance the decay widths. It is found that the standard model prediction for the Z->\gamma\gamma\gamma{} decay remains essentially unchanged, as the new physics effects quickly decouples. On the other hand, it is found that the contributions of the new exotic quarks and gauge bosons predicted by this model lead to a branching fraction for the Z'->\gamma\gamma\gamma{} decay of about 10^(-6), which is about three orders of magnitude larger than that of the Z->\gamma\gamma\gamma{} decay.