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Search for lepton-flavor-violation in Z-boson decays with 𝜏-leptons with the ATLAS detector

ContributorsATLAS Collaboration
Published inPhysical review letters, vol. 127, no. 27, 271801
Publication date2022
First online date2021-12-28
Abstract

A search for lepton-flavor-violating $Z\to e\tau$ and $Z\to\mu\tau$ decays with $pp$ collision data recorded by the ATLAS detector at the LHC is presented. This analysis uses 139 fb$^{-1}$ of Run 2 $pp$ collisions at $\sqrt{s}=13$ TeV and is combined with the results of a similar ATLAS search in the final state in which the $\tau$-lepton decays hadronically, using the same data set as well as Run 1 data. The addition of leptonically decaying $\tau$-leptons significantly improves the sensitivity reach for $Z\to\ell\tau$ decays. The $Z\to\ell\tau$ branching fractions are constrained in this analysis to $\mathcal{B}(Z\to e\tau)<7.0\times10^{-6}$ and $\mathcal{B}(Z\to \mu\tau)<7.2\times10^{-6}$ at 95% confidence level. The combination with the previously published analyses sets the strongest constraints to date: $\mathcal{B}(Z\to e\tau)<5.0\times10^{-6}$ and $\mathcal{B}(Z\to \mu\tau)<6.5\times10^{-6}$ at 95% confidence level.

Keywords
  • P p: scattering
  • P p: colliding beams
  • Z0: leptonic decay
  • Z0: rare decay
  • Lepton: flavor: violation
  • Tau: hadronic decay
  • ATLAS
  • Z0: branching ratio: upper limit
  • Sensitivity
  • CERN LHC Coll
  • Experimental results
  • Z0 --> electron tau
  • Z0 --> muon tau
  • 13000 GeV-cms
  • S044.25
  • S044.26
Citation (ISO format)
ATLAS Collaboration. Search for lepton-flavor-violation in Z-boson decays with 𝜏-leptons with the ATLAS detector. In: Physical review letters, 2022, vol. 127, n° 27, p. 271801. doi: 10.1103/physrevlett.127.271801
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Article (Published version)
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Journal ISSN0031-9007
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