The lepton flavor violating decays $Z\to l_i l_j$ in the simplest little Higgs model

TL;DR

This paper investigates lepton flavor violating decays of the Z boson within the simplest little Higgs model, showing that branching ratios could be detectable at future collider experiments.

Contribution

It provides the first detailed calculation of Z boson lepton flavor violating decay rates in the simplest little Higgs model, highlighting potential experimental observability.

Findings

Branching ratios can reach 10^{-7} for Z→l_i l_j decays.

Decays are potentially observable at the GigaZ option of the ILC.

Flavor-changing interactions involve heavy neutrinos and Standard Model leptons.

Abstract

In the simplest little Higgs model the new flavor-changing interactions between heavy neutrinos and the Standard Model leptons can generate contributions to some lepton flavor violating decays of $Z$-boson at one-loop level, such as $Z \to \tau^{\pm}\mu^{\mp}$, $Z\to \tau^{\pm}e^{\mp}$, and $Z \to \mu^{\pm}e^{\mp}$. We examine the decay modes, and find that the branching ratios can reach $10^{-7}$ for the three decays, which should be accessible at the Giga$Z$ option of the ILC.