Search for lepton-flavor-violating decays of the Z boson into a τ lepton and a light lepton with the ATLAS detector

(ATLAS Collaboration)

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Direct searches for lepton flavor violation in decays of the Z boson with the ATLAS detector at the LHC are presented. Decays of the Z boson into an electron or muon and a hadronically decaying τ lepton are considered. The searches are based on a data sample of proton-proton collisions collected by the ATLAS detector in 2015 and 2016, corresponding to an integrated luminosity of 36.1 fb-1 at a center-of-mass energy of s=13 TeV. No statistically significant excess of events above the expected background is observed, and upper limits on the branching ratios of lepton-flavor-violating decays are set at the 95% confidence level: B(Z→eτ)<5.8×10-5 and B(Z→μτ)<2.4×10-5. This is the first limit on B(Z→eτ) with ATLAS data. The upper limit on B(Z→μτ) is combined with a previous ATLAS result based on 20.3 fb-1 of proton-proton collision data at a center-of-mass energy of s=8 TeV and the combined upper limit at 95% confidence level is B(Z→μτ)<1.3×10-5.

Original languageEnglish
Article number092010
JournalPhysical Review D
Volume98
Issue number9
DOIs
Publication statusPublished - 2018 Nov 1

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leptons
bosons
protons
detectors
decay
center of mass
confidence
collisions
muons
luminosity
energy
electrons

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Search for lepton-flavor-violating decays of the Z boson into a τ lepton and a light lepton with the ATLAS detector. / (ATLAS Collaboration).

In: Physical Review D, Vol. 98, No. 9, 092010, 01.11.2018.

Research output: Contribution to journalArticle

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abstract = "Direct searches for lepton flavor violation in decays of the Z boson with the ATLAS detector at the LHC are presented. Decays of the Z boson into an electron or muon and a hadronically decaying τ lepton are considered. The searches are based on a data sample of proton-proton collisions collected by the ATLAS detector in 2015 and 2016, corresponding to an integrated luminosity of 36.1 fb-1 at a center-of-mass energy of s=13 TeV. No statistically significant excess of events above the expected background is observed, and upper limits on the branching ratios of lepton-flavor-violating decays are set at the 95{\%} confidence level: B(Z→eτ)<5.8×10-5 and B(Z→μτ)<2.4×10-5. This is the first limit on B(Z→eτ) with ATLAS data. The upper limit on B(Z→μτ) is combined with a previous ATLAS result based on 20.3 fb-1 of proton-proton collision data at a center-of-mass energy of s=8 TeV and the combined upper limit at 95{\%} confidence level is B(Z→μτ)<1.3×10-5.",
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