Search for charged lepton flavor violating Z and Z' boson decays in proton-proton collisions at √s=13 TeV

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10512835" target="_blank" >RIV/00216208:11320/25:10512835 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=9urbxVlecc" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=9urbxVlecc</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/8lw4-6lyk" target="_blank" >10.1103/8lw4-6lyk</a>

Result language
angličtina
Original language name
Search for charged lepton flavor violating Z and Z' boson decays in proton-proton collisions at √s=13 TeV
Original language description
A search for flavor violating decays of the Z boson to charged leptons is performed using data from proton-proton collisions at root s = 13 TeV collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 138 fb(-1). Each of the decays Z -> e mu, Z -> e tau, and Z -> mu tau is considered. The data are consistent with the backgrounds expected from standard model processes. For the Z -> e mu channel the observed (expected) 95% confidence level upper limit on the branching fraction is 1.9(2.0) x 10(-7), which is the most stringent direct limit to date on this process; the corresponding limits for the Z -> e tau and Z -> mu tau channels are 13.8(11.4) x 10(-6) and 12.0(5.3) x 10(-6), respectively. Additionally, the e mu final state is used to search for lepton flavor violating decays of Z' resonances in the mass range from 110 to 500 GeV. No significant excess is observed above the predicted background levels.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10300 - Physical sciences

Project
<a href="/en/project/LM2023040" target="_blank" >LM2023040: Research infrastructure for experiments at CERN</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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