A search for a new pseudoscalar a-boson produced in events with a top-quark pair, where the a-boson decays into a pair of muons, is performed using root s=13 TeV pp collision data collected with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 139 fb(-1). The search targets the final state where only one top quark decays to an electron or muon, resulting in a signature with three leptons e mu mu and mu mu mu. No significant excess of events above the Standard Model expectation is observed and upper limits are set on two signal models: pp -> tta and pp -> tt with t -> H(perpendicular to)b, H-perpendicular to -> W(perpendicular to)a, where a ->mu mu, in the mass ranges 15 GeV<72 GeV and 120 GeV <= m(H +/-)<= 160 GeV.

Search for a new pseudoscalar decaying into a pair of muons in events with a top-quark pair at√s=13 TeV with the ATLAS detector / G. Aad, B.A.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 108:9(2023), pp. 092007.1-092007.26. [10.1103/physrevd.108.092007]

Search for a new pseudoscalar decaying into a pair of muons in events with a top-quark pair at√s=13 TeV with the ATLAS detector

A. Andreazza;A. Carbone;L. Carminati;S. D’Auria;M. Fanti;M. Lazzaroni;E. Mazzeo;A. Murrone;L. Perini;F. Piazza;F. Ragusa;A. Stabile;
2023

Abstract

A search for a new pseudoscalar a-boson produced in events with a top-quark pair, where the a-boson decays into a pair of muons, is performed using root s=13 TeV pp collision data collected with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 139 fb(-1). The search targets the final state where only one top quark decays to an electron or muon, resulting in a signature with three leptons e mu mu and mu mu mu. No significant excess of events above the Standard Model expectation is observed and upper limits are set on two signal models: pp -> tta and pp -> tt with t -> H(perpendicular to)b, H-perpendicular to -> W(perpendicular to)a, where a ->mu mu, in the mass ranges 15 GeV<72 GeV and 120 GeV <= m(H +/-)<= 160 GeV.
Settore FIS/01 - Fisica Sperimentale
Settore ING-INF/07 - Misure Elettriche e Elettroniche
2023
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.108.092007
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1032548
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