A search for charged lepton flavour violation in tau -> 3 mu 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 fb-1. The search is optimised for the electroweak W -> tau nu production channel, due to its higher trigger efficiency, but also considers potential signal events from heavy-flavour production. 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(tau -> 3 mu) is found to be 8.7×10-8 (7.5×10-8) at 90% CL

Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N.j., et al. (2026). A search for lepton-flavour violating tau -> 3 mu decays with the ATLAS detector. PHYSICS LETTERS. SECTION B, 880 [10.1016/j.physletb.2026.140748].

A search for lepton-flavour violating tau -> 3 mu decays with the ATLAS detector

Aielli, G.;Camarri, P.;Cerrito, L.;De Sanctis, U.;Di Ciaccio, A.;
2026-01-01

Abstract

A search for charged lepton flavour violation in tau -> 3 mu 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 fb-1. The search is optimised for the electroweak W -> tau nu production channel, due to its higher trigger efficiency, but also considers potential signal events from heavy-flavour production. 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(tau -> 3 mu) is found to be 8.7×10-8 (7.5×10-8) at 90% CL
2026
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Rilevanza internazionale
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Esperti anonimi
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
English
Con Impact Factor ISI
Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N.j., et al. (2026). A search for lepton-flavour violating tau -> 3 mu decays with the ATLAS detector. PHYSICS LETTERS. SECTION B, 880 [10.1016/j.physletb.2026.140748].
Aad, G; Aakvaag, E; Abbott, B; Abdelhameed, S; Abeling, K; Abicht, Nj; Abidi, Sh; Aboelela, M; Aboulhorma, A; Abramowicz, H; Acharya, Bs; Ackermann, A...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/474304
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