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

G. Aad, T.P.A. Åkesson, E.E. Corrigan, C. Doglioni, J. Geisen, E. Hansen, V. Hedberg, G. Jarlskog, B. Konya, E. Lytken, K.H. Mankinen, C. Marcon, J.U. Mjörnmark, G.A. Mullier, R. Poettgen, E. Skorda, O. Smirnova, L. Zwalinski, ATLAS Collaboration

Research output: Contribution to journalArticlepeer-review


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)
Original languageEnglish
Article number271801
JournalPhysical Review Letters
Issue number27
Publication statusPublished - 2021

Subject classification (UKÄ)

  • Subatomic Physics

Free keywords

  • Decay (organic)
  • Tellurium compounds
  • ATLAS detectors
  • Branching fractions
  • Confidence levels
  • Data set
  • Final state
  • Lepton flavour violations
  • Lepton-flavor
  • Z Bosons
  • Bosons
  • article
  • boson
  • flavor
  • lepton


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