Lepton-flavor violating decays as probes of quantum gravity?

TL;DR

This paper explores how certain lepton-flavor violating decays could serve as indicators of low-scale quantum gravity effects or new physics at the TeV scale, potentially leading to observable phenomena.

Contribution

It demonstrates that specific lepton-flavor violating decays could have significant magnitudes if generated by low-scale quantum gravity or TeV-scale new physics.

Findings

Decays $Z o au $, $J/\u03a9$, and $ o  au$ can be sizable.

Such decays could serve as probes for quantum gravity effects.

The magnitude of these decays depends on the presence of lepton-flavor violating 4-fermion operators.

Abstract

Lepton flavor violating decays $Z \to \mu \tau$ and $J/\Psi, \Upsilon \to \mu \tau$ are considered. It is shown that these decays can reach sizeable magnitudes if some specific lepton-flavor violating 4-fermion operators are generated by low scale quantum gravity effects, or by some other new physics at a TeV scale.