Published in

arXiv, 2022

DOI: 10.48550/arxiv.2204.10783

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Search for the charged-lepton-flavor-violating decay $Z→ eμ$ in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

Journal article published in 2023 by Georges Aad ORCID, Marta Baselga, Braden Abbott, Dale Abbott, Adam Abed Abud, Kira Abeling, Deshan Abhayasinghe, Syed Haider Abidi, Asmaa Aboulhorma, Halina Abramowicz, Henso Abreu, Yiming Abulaiti, Angel Abusleme, Bobby Acharya, Baida Achkar and other authors.
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This paper was not found in any repository; the policy of its publisher is unknown or unclear.

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Abstract

A search for the charged-lepton-flavor-violating process $Z→ eμ$ is presented, using 139 fb$^{-1}$ of $\sqrt{s}=13$ 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 $B(Z→ eμ) < 2.62 \times 10^{-7}$ is placed on the branching fraction at 95% confidence level, which is the most stringent limit to date.