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

KAI-FENG CHEN et al.WEI-SHU HOU et al.PAO-TI CHANG et al.RONG-SHYANG LU et al.2021-07-282021-07-28202110298479https://www.scopus.com/inward/record.uri?eid=2-s2.0-85100246982&doi=10.1007%2fJHEP01%282021%29163&partnerID=40&md5=7957f9c1b50edd8cb5077e752bf7119ahttps://scholars.lib.ntu.edu.tw/handle/123456789/573523Results are reported from a search for the lepton flavor violating decay τ → 3μ in proton-proton collisions at s = 13 TeV. The data sample corresponds to an integrated luminosity of 33.2 fb?1 recorded by the CMS experiment at the LHC in 2016. The search exploits τ leptons produced in both W boson and heavy-flavor hadron decays. No significant excess above the expected background is observed. An upper limit on the branching fraction ?(τ → 3μ) of 8.0 × 10?8 at 90% confidence level is obtained, with an expected upper limit of 6.9 × 10?8. [Figure not available: see fulltext.] ? 2021, The Author(s).Search for the lepton flavor violating decay τ → 3μ in proton-proton collisions at √s = 13 TeVjournal article10.1007/JHEP01(2021)1632-s2.0-85100246982