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 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 B(Z→eτ)<7.0×10-6 and B(Z→μτ)<7.2×10-6 at 95% confidence level. The combination with the previously published analyses sets the strongest constraints to date: B(Z→eτ)<5.0×10-6 and B(Z→μτ)<6.5×10-6 at 95% confidence level.

Search for Lepton-Flavor Violation in Z -Boson Decays with τ Leptons with the ATLAS Detector / Aad, G., Abbott, B., Abbott, D.C., Abed Abud, A., Abeling, K., Abhayasinghe, D.K., Abidi, S.H., Abramowicz, H., Abreu, H., Abulaiti, Y., Abusleme Hoffman, A.C., Acharya, B.S., Achkar, B., Adam, L., Adam Bourdarios, C., Adamczyk, L., Adamek, L., Adelman, J., Adiguzel, A., Adorni, S., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 127:27(2021), p. 271801. [10.1103/PhysRevLett.127.271801]

Search for Lepton-Flavor Violation in Z -Boson Decays with τ Leptons with the ATLAS Detector

Cristoforetti M.;Di Luca A.;Follega F. M.;Iuppa R.;Ricci E.;
2021-01-01

Abstract

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 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 B(Z→eτ)<7.0×10-6 and B(Z→μτ)<7.2×10-6 at 95% confidence level. The combination with the previously published analyses sets the strongest constraints to date: B(Z→eτ)<5.0×10-6 and B(Z→μτ)<6.5×10-6 at 95% confidence level.
2021
27
Aad, G.; Abbott, B.; Abbott, D. C.; Abed Abud, A.; Abeling, K.; Abhayasinghe, D. K.; Abidi, S. H.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; Abusleme H...espandi
Search for Lepton-Flavor Violation in Z -Boson Decays with τ Leptons with the ATLAS Detector / Aad, G., Abbott, B., Abbott, D.C., Abed Abud, A., Abeling, K., Abhayasinghe, D.K., Abidi, S.H., Abramowicz, H., Abreu, H., Abulaiti, Y., Abusleme Hoffman, A.C., Acharya, B.S., Achkar, B., Adam, L., Adam Bourdarios, C., Adamczyk, L., Adamek, L., Adelman, J., Adiguzel, A., Adorni, S., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 127:27(2021), p. 271801. [10.1103/PhysRevLett.127.271801]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/354517
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