A search for flavor violating decays of the Z boson to charged leptons is performed using data from proton-proton collisions at √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 → eμ, Z → eτ, and Z → μτ is considered. The data are consistent with the backgrounds expected from standard model processes. For the Z → eμ channel thebobserved (expected) 95% confidence level upper limit on the branching fraction is 1.9(2.0) × 10^−7, which is the most stringent direct limit to date on this process; the corresponding limits for the Z → eτ and Z → μτ channels are 13.8(11.4) × 10^−6 and 12.0(5.3) × 10^−6, respectively. Additionally, the eμ final state is used to search for lepton flavor violating decays of Z_0 resonances in the mass range from 110 to 500 GeV. No significant excess is observed above the predicted background levels.

Hayrapetyan, A., Makarenko, V., Tumasyan, A., Adam, W., Andrejkovic, J. w., Benato, L., et al. (2025). Search for charged lepton flavor violating 𝑍 and 𝑍′ boson decays in proton-proton collisions at √s = 13  TeV. PHYSICAL REVIEW D, 112, 1-36 [10.1103/8lw4-6lyk].

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

Battilana, C.;Bonacorsi, D.;Capiluppi, P.;Cuffiani, M.;Diotalevi, T.;Fanfani, A.;Guiducci, L.;Lorusso, M.;Lunerti, L.;Navarria, F.  L.;Paggi, G.;Rossi Tisbeni, S.;Rovelli, T.;Siroli, G.  P.;
2025

Abstract

A search for flavor violating decays of the Z boson to charged leptons is performed using data from proton-proton collisions at √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 → eμ, Z → eτ, and Z → μτ is considered. The data are consistent with the backgrounds expected from standard model processes. For the Z → eμ channel thebobserved (expected) 95% confidence level upper limit on the branching fraction is 1.9(2.0) × 10^−7, which is the most stringent direct limit to date on this process; the corresponding limits for the Z → eτ and Z → μτ channels are 13.8(11.4) × 10^−6 and 12.0(5.3) × 10^−6, respectively. Additionally, the eμ final state is used to search for lepton flavor violating decays of Z_0 resonances in the mass range from 110 to 500 GeV. No significant excess is observed above the predicted background levels.
2025
Hayrapetyan, A., Makarenko, V., Tumasyan, A., Adam, W., Andrejkovic, J. w., Benato, L., et al. (2025). Search for charged lepton flavor violating �� and ��′ boson decays in proton-proton collisions at √s = 13  TeV. PHYSICAL REVIEW D, 112, 1-36 [10.1103/8lw4-6lyk].
Hayrapetyan, A.; Makarenko, V.; Tumasyan, A.; Adam, W.; Andrejkovic, J.  w.; Benato, L.; Bergauer, T.; Dragicevic, M.; Giordano, C.; Hussain, P.  s.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1047229
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