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

ATLAS Collaboration

Preprint

PUBDB-2022-01904

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

ATLAS Collaboration (Collaboration author)DESY*

2022

[10.3204/PUBDB-2022-01904]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2022-01904

Report No.: CERN-EP-2022-007; arXiv:2204.10783

Abstract: A search for the charged-lepton-flavor-violating process $Z\rightarrow e\mu$ 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 $e\mu$ invariant mass spectrum near the $Z$ boson mass would be a striking signature of new physics. No excess is observed, and an upper limit ${\cal B}(Z\rightarrow e\mu) < 2.62 \times 10^{-7}$ is placed on the branching fraction at 95% confidence level, which is related to a ratio of the observed $e\mu$ yield to the average of the observed yields of $ee$ and $\mu\mu$ events to significantly reduce systematic uncertainties.

Keyword(s): p p, scattering ; boson, mass ; new physics, signature ; ATLAS ; TeV ; mass spectrum ; CERN LHC Coll ; branching ratio

Note: 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/

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