Search for the charged-lepton-flavor-violating decay Z→eμ in pp collisions at √s = 13 TeV with the ATLAS detector

ATLAS Collaboration, Paul Newman

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Abstract

A search for the charged-lepton-flavor-violating process Z→eμ is presented, using 139 fb−1 of √s = 13 TeV pp collision data collected by the ATLAS experiment at the LHC. An excess in the eμ invariant mass spectrum near the Z boson mass would be a striking signature of new physics. No excess is observed, and an upper limit B(Z→eμ)<2.62×10−7 is placed on the branching fraction at 95% confidence level, which is related to a ratio of the observed eμ yield to the average of the observed yields of ee and μμ events to significantly reduce systematic uncertainties.
Original languageEnglish
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Publication statusAccepted/In press - 7 Jul 2022

Bibliographical note

Not yet published as of 08/08/2022

14 pages in total, 2 figures, 3 tables, submitted to Phys. Rev. D. All figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2018-35/

Keywords

  • hep-ex

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