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


Hayrapetyan A., Makarenko V., Tumasyan A., Adam W., Andrejkovic J. W., Benato L., ...Daha Fazla

PHYSICAL REVIEW D, cilt.112, sa.11, 2025 (SCI-Expanded, Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 112 Sayı: 11
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1103/8lw4-6lyk
  • Dergi Adı: PHYSICAL REVIEW D
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, INSPEC, MathSciNet, zbMATH, Nature Index
  • İstanbul Üniversitesi Adresli: Evet

Özet

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.