Search for Lepton-Flavor Violation in Z-Boson Decays with τ Leptons with the ATLAS Detector

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dc.contributor.authorAad, G.
dc.contributor.authorAbbott, B.
dc.contributor.authorAbbott, D.C.
dc.contributor.authorAbud, A.A.
dc.contributor.authorAbeling, K.
dc.contributor.authorAbhayasinghe, D.K.
dc.contributor.authorAbidi, S.H.
dc.contributor.authorZeid, O.S.A.
dc.contributor.authorAbraham, N.L.
dc.contributor.authorAbramowicz, H.
dc.contributor.authorAbreu, H.
dc.contributor.authorAbulaiti, Y.
dc.contributor.authorAcharya, B.S.
dc.contributor.authorAchkar, B.
dc.contributor.authorAdam, L.
dc.contributor.authorBourdarios, C.A.
dc.contributor.authorAdamczyk, L.
dc.contributor.authorAdamek, L.
dc.contributor.authorAdelman, J.
dc.contributor.authorAdiguzel, A.
dc.contributor.authoret al.
dc.date.issued2021
dc.descriptionPublished 28 December 2021
dc.description.abstractA 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 ffiffiffi s p ¼ 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 BðZ → eτÞ < 7.0 × 10−6 and BðZ → μτÞ < 7.2 × 10−6 at 95% confidence level. The combination with the previously published analyses sets the strongest constraints to date: BðZ → eτÞ < 5.0 × 10−6 and BðZ → μτÞ < 6.5 × 10−6 at 95% confidence level.
dc.description.statementofresponsibilityG. Aad ... D. Duvnjak ... P. Jackson ... A. X. Y. Kong ... J. L. Oliver ... H. Potti ... T. A. Ruggeri ... K. Sato ... A. S. Sharma ... M. J. White ... et al. (ATLAS Collaboration)
dc.identifier.citationPhysical Review Letters, 2021; 127(17):271801-1-271801-20
dc.identifier.doi10.1103/PhysRevLett.127.271801
dc.identifier.issn0031-9007
dc.identifier.issn1079-7114
dc.identifier.orcidJackson, P. [0000-0002-0847-402X]
dc.identifier.orcidKong, A.X.Y. [0000-0001-8063-8765]
dc.identifier.orcidMcDougall, A.E. [0000-0001-7713-2800]
dc.identifier.orcidOliver, J.L. [0000-0002-0713-6627]
dc.identifier.orcidPotti, H. [0000-0002-0800-9902]
dc.identifier.orcidRuggeri, T.A. [0000-0001-9941-1966]
dc.identifier.orcidSato, K. [0000-0001-8988-4065]
dc.identifier.urihttps://hdl.handle.net/2440/134749
dc.language.isoen
dc.publisherAmerican Physical Society
dc.rights© 2021 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3
dc.source.urihttps://doi.org/10.1103/physrevlett.127.271801
dc.subjectATLAS Collaboration
dc.titleSearch for Lepton-Flavor Violation in Z-Boson Decays with τ Leptons with the ATLAS Detector
dc.title.alternativeSearch for Lepton-Flavor Violation in Z-Boson Decays with tau Leptons with the ATLAS Detector
dc.typeJournal article
pubs.publication-statusPublished

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