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A search for lepton-flavour violating $τ\to 3μ$ decays with the ATLAS detector
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A search for lepton-flavour violating $τ\to 3μ$ decays with the ATLAS detector

Georges Aad, Erlend Aakvaag, Braden Keim Abbott, Sara Abdelhameed, Kira Abeling, Nils Julius Abicht, Haider Abidi, Mohammed Aboelela, Asmaa Aboulhorma, Halina Abramowicz, …
Deutsches Elektronen-Synchrotron, DESY, Hamburg
2026
DOI: https://doi.org/10.3204/pubdb-2026-01624

摘要

A search for charged lepton flavour violation in $τ\to 3μ$ decays is performed in $pp$ collisions at a centre-of-mass energy of 13 TeV using ATLAS data collected between 2016 and 2018, corresponding to an integrated luminosity of 137 $\text{fb}^{-1}$. The search focuses on the electroweak $W \to τν$ production channel. Data are collected using two-muon and three-muon triggers and a multivariate analysis is used to separate the signal from the background. An unbinned likelihood fit is then performed to the resulting three-muon invariant mass spectrum and the data are found to be compatible with the background-only hypothesis. The observed (expected) limit on the branching ratio $B(τ\to3μ)$ is found to be $8.7\times 10^{-8}$ ($7.5\times 10^{-8}$) at $90\%$ CL.

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