Study of CMS sensitivity to neutrinoless $\tau$ decay at LHC

TL;DR

This study assesses CMS detector's ability to detect rare neutrinoless tau decays at the LHC, using detailed simulations to evaluate sensitivity for specific decay channels.

Contribution

It provides the first detailed simulation-based analysis of CMS sensitivity to neutrinoless tau decays, focusing on the channels tau to three muons and tau to mu gamma.

Findings

Sensitivity estimates for tau to 3 muons decay channel

Sensitivity estimates for tau to mu gamma decay channel

Demonstrates CMS's potential to study rare tau decays

Abstract

The Large Hadron Collider (LHC), scheduled to start operation in 2006, is foreseen to provide in the first year of running a total of $\sim 10^{12}$ $\tau$ leptons. CMS (Compact Muon Solenoid) is a general-purpose experiment designed to study proton-proton and heavy-ion collisions at LHC. Even if the Susy particles and Higgs searches togheter with the B-physics present its main goal, the large amount of $\tau$-lepton, could allow a systematic study of tau-physics. We have performed a full simulation of CMS using GEANT 3 package and the object-oriented reconstruction program ORCA to study the sensitivity to neutrinoless tau decay $\tau \to \mu^+ \mu^- \mu^- $ and $\tau \to \mu \gamma$. We present the analysis developed for these channels and the results obtained.