Search for lepton-flavor-violating decays of the Z boson into a τ lepton and a light lepton with the ATLAS detector /M. Aaboud, G. Aad, B. Abbott [et al.]

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Другой Автор
Aad, G.
Abbott, B.
Chelkov, G. A.
Khodinov, A.
Parida, B.
Tsybychev, D.
Vaniachine, A.
Aaboud, M.
Источник
Physical Review D 2018 Vol. 98, № 9. P. 092010-1-092010-31
Аннотация
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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статьи в журналах
Резюме
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.