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

Summary, in English

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)

• Author: 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
• Department/s: Particle and nuclear physics; eSSENCE: The e-Science Collaboration
• Publishing year: 2021
• Language: English
• Publication/Series: Physical Review Letters
• Volume: 127
• Issue: 27
• Links: http://dx.doi.org/10.1103/PhysRevLett.127.271801
• Document type: Journal article
• Publisher: American Physical Society
• Topic: Subatomic Physics
• 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
• Status: Published
• ISBN/ISSN/Other: ISSN: 0031-9007