Search for the lepton flavor violating τ → 3μ decay in proton-proton collisions at s=13TeV

The CMS collaboration

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Abstract

A search for the lepton flavor violating τ→3μ decay is performed using proton-proton collision events at a center-of-mass energy of 13 TeV collected by the CMS experiment at the LHC in 2017–2018, corresponding to an integrated luminosity of 97.7 fb−1. Tau leptons produced in both heavy-flavor hadron and W boson decays are exploited in the analysis. No evidence for the decay is observed. The results of this search are combined with an earlier null result based on data collected in 2016 to obtain a total integrated luminosity of 131 fb−1. The observed (expected) upper limits on the branching fraction B(τ→3μ) at confidence levels of 90 and 95% are 2.9×10−8 (2.4×10−8) and 3.6×10−8 (3.0×10−8), respectively.

Original languageEnglish
Article number138633
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume853
DOIs
Publication statusPublished - Jun 2024
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2024 The Author(s)

Keywords

  • BSM
  • CLFV
  • CMS
  • Charged lepton flavor violation

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