A search for pair-produced scalar or vector lep- toquarks decaying into a b-quark and a τ -lepton is pre- sented using the full LHC Run 2 (2015–2018) data sample of 139 fb−1 collected with the ATLAS detector in proton– proton collisions at a centre-of-mass energy of √s = 13 TeV. Events in which at least one τ -lepton decays hadronically are considered, and multivariate discriminants are used to extract the signals. No significant deviations from the Stan- dard Model expectation are observed and 95% confidence- level upper limits on the production cross-section are derived as a function of leptoquark mass and branching ratio B into a τ -lepton and b-quark. For scalar leptoquarks, masses below 1460 GeV are excluded assuming B = 100%, while for vector leptoquarks the corresponding limit is 1650 GeV (1910 GeV) in the minimal-coupling (Yang–Mills) scenario.

Search for pair production of third-generation leptoquarks decaying into a bottom quark and a τ -lepton with the ATLAS detector / G. Aad, B.A.. - In: EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6052. - 83:11(2023), pp. 1075.1-1075.35. [10.1140/epjc/s10052-023-12104-7]

Search for pair production of third-generation leptoquarks decaying into a bottom quark and a τ -lepton with the ATLAS detector

A. Andreazza;E. Ballabene;A. Carbone;L. Carminati;S. D’Auria;L. Dell’Asta;M. Fanti;M. Lazzaroni;C. Meroni;A. Murrone;L. Perini;F. Piazza;F. Ragusa;A. Stabile;
2023

Abstract

A search for pair-produced scalar or vector lep- toquarks decaying into a b-quark and a τ -lepton is pre- sented using the full LHC Run 2 (2015–2018) data sample of 139 fb−1 collected with the ATLAS detector in proton– proton collisions at a centre-of-mass energy of √s = 13 TeV. Events in which at least one τ -lepton decays hadronically are considered, and multivariate discriminants are used to extract the signals. No significant deviations from the Stan- dard Model expectation are observed and 95% confidence- level upper limits on the production cross-section are derived as a function of leptoquark mass and branching ratio B into a τ -lepton and b-quark. For scalar leptoquarks, masses below 1460 GeV are excluded assuming B = 100%, while for vector leptoquarks the corresponding limit is 1650 GeV (1910 GeV) in the minimal-coupling (Yang–Mills) scenario.
Settore FIS/01 - Fisica Sperimentale
Settore ING-INF/07 - Misure Elettriche e Elettroniche
2023
24-nov-2023
https://link.springer.com/article/10.1140/epjc/s10052-023-12104-7
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1051028
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