Aad, G.Abbott, B.Abbott, D.C.Abed Abud, A.Abeling, K.Abhayasinghe, D.K.Abidi, S.H.Abramowicz, H.Abreu, H.Abulaiti, Y.Abusleme Hoffman, A.C.Acharya, B.S.Achkar, B.Adam, L.Adam Bourdarios, C.Adamczyk, L.Adamek, L.Adelman, J.Adiguzel, A.Adorni, S.Adye, T.Affolder, A.A.Afik, Y.Agapopoulou, C.Agaras, M.N.Agarwala, J.Aggarwal, A.Agheorghiesei, C.Aguilar-Saavedra, J.A.Ahmad, A.Ahmadov, F.Ahmed, W.S.Ai, X.Aielli, G.Akatsuka, S.Akbiyik, M.Åkesson, T.P.A.Akimov, A.V.Al Khoury, K.Alberghi, G.L.Albert, J.Alconada Verzini, M.J.Alderweireldt, S.Aleksa, M.Aleksandrov, I.N.Alexa, C.Alexopoulos, T.Alfonsi, A.Alfonsi, F.Alhroob, M.Ali, B.Ali, S.Aliev, M.Alimonti, G.Allaire, C.Allbrooke, B.M.M.Allport, P.P.Aloisio, A.Alonso, F.Alpigiani, C.2024-12-262024-12-262021-12-31Physical Review Letters, Volume 127, Issue 27, 31 December 2021, Article number 2718010031-9007https://repositorio.unab.cl/handle/ria/62717Indexación: Scopus.A search for lepton-flavor-violating Z→eτ and Z→μτ decays with pp collision data recorded by the ATLAS detector at the LHC is presented. This analysis uses 139 fb-1 of Run 2 pp collisions at s=13 TeV and is combined with the results of a similar ATLAS search in the final state in which the τ lepton decays hadronically, using the same data set as well as Run 1 data. The addition of leptonically decaying τ leptons significantly improves the sensitivity reach for Z→ℓτ decays. The Z→ℓτ branching fractions are constrained in this analysis to B(Z→eτ)<7.0×10-6 and B(Z→μτ)<7.2×10-6 at 95% confidence level. The combination with the previously published analyses sets the strongest constraints to date: B(Z→eτ)<5.0×10-6 and B(Z→μτ)<6.5×10-6 at 95% confidence level. © 2021 CERN.enTellurium compoundsATLAS detectorsBranching fractionsConfidence levelsData setFinal stateLepton flavour violationsLepton-flavorZ BosonsArtículoAttribution 4.0 International CC BY 4.0 Deed10.1103/PhysRevLett.127.271801