Search for Lepton-Flavor Violation in -Boson Decays with Leptons with the ATLAS Detector
A search for lepton-flavor-violating Z→eτ and Z→μτ 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 τ lepton decays hadronically, using the same data set as well as Run 1 data. The addition of leptonically decaying τ leptons significantly improves the sensitivity reach for Z→ℓτ decays. The Z→ℓτ branching fractions are constrained in this analysis to $$\mathcal{B}$$(Z→eτ) < 7.0 x 10-6 and $$\mathcal{B}$$(Z→μτ) < 7.2×10-6 at 95% confidence level. The combination with the previously published analyses sets the strongest constraints to date: $$\mathcal{B}$$(Z→eτ) < 5.0 x 10-6 and $$\mathcal{B}$$(Z→μτ) < 6.5 x 10-6 at 95% confidence level.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- Contributing Organization:
- ATLAS Collaboration
- Grant/Contract Number:
- AC02-05CH11231; AC02-76SF00515
- OSTI ID:
- 1837603
- Alternate ID(s):
- OSTI ID: 1843386; OSTI ID: 1862926
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Vol. 127 Journal Issue: 27; ISSN 0031-9007
- Publisher:
- American Physical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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