Z boson decay to photon plus Kaluza-Klein graviton: large extra dimensional bounds

TL;DR

This paper investigates the decay of Z bosons into photons and Kaluza-Klein gravitons within the ADD model, setting experimental bounds using LEP data and analyzing energy profiles of the decay process.

Contribution

It provides the first experimental upper bound on the Z boson decay into photon and Kaluza-Klein graviton in the ADD model and explores the decay's energy distribution.

Findings

Upper bound on decay branching ratio ~10^-11

Constraints on large extra dimension models from LEP data

Analysis of energy profiles of the decay process

Abstract

We consider the phenomenology of the decay of a Z boson into a photon and a Kaluza-Klein excitation of the graviton in the ADD model. Using LEP data, we obtain an upper bound on the branching ratio corresponding to this process of ~10^-11. We also investigate energy profiles of the process.