This paper presents a search for top-squark pair production in final states with a top quark, a charm quark and missing transverse momentum. The data were collected with the ATLAS detector during LHC Run 2 and correspond to an integrated luminosity of 139 fb−1 of proton-proton collisions at a centre-of-mass energy of √s = 13 TeV. The analysis is motivated by an extended Minimal Supersymmetric Standard Model featuring a non-minimal flavour violation in the second- and third-generation squark sector. The top squark in this model has two possible decay modes, either ˜t1 → c ˜χ0 1 or ˜t1 → t ˜χ0 1, where the ˜χ0 1 is undetected. The analysis is optimised assuming that both of the decay modes are equally probable, leading to the most likely final state of tc + Emiss T . Good agreement is found between the Standard Model expectation and the data in the search regions. Exclusion limits at 95% CL are obtained in the m( ˜t1) vs. m( ˜χ0 1) plane and, in addition, limits on the branching ratio of the ˜t1 → t ˜χ0 1 decay as a function of m( ˜t1) are also produced. Top-squark masses of up to 800 GeV are excluded for scenarios with light neutralinos, and top-squark masses up to 600 GeV are excluded in scenarios where the neutralino and the top squark are almost mass degenerate.

A search for top-squark pair production, in final states containing a top quark, a charm quark and missing transverse momentum, using the 139 fb−1 of pp collision data collected by the ATLAS detector / G. Aad, B.A.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2024:7(2024), pp. 1-49. [10.1007/jhep07(2024)250]

A search for top-squark pair production, in final states containing a top quark, a charm quark and missing transverse momentum, using the 139 fb−1 of pp collision data collected by the ATLAS detector

A. Andreazza;A. Carbone;L. Carminati;S. D'Auria;L. Dell'Asta;M. Fanti;M. Lazzaroni;E. Mazzeo;C. Meroni;A. Murrone;L. Perini;F. Ragusa;A. Stabile;
2024

Abstract

This paper presents a search for top-squark pair production in final states with a top quark, a charm quark and missing transverse momentum. The data were collected with the ATLAS detector during LHC Run 2 and correspond to an integrated luminosity of 139 fb−1 of proton-proton collisions at a centre-of-mass energy of √s = 13 TeV. The analysis is motivated by an extended Minimal Supersymmetric Standard Model featuring a non-minimal flavour violation in the second- and third-generation squark sector. The top squark in this model has two possible decay modes, either ˜t1 → c ˜χ0 1 or ˜t1 → t ˜χ0 1, where the ˜χ0 1 is undetected. The analysis is optimised assuming that both of the decay modes are equally probable, leading to the most likely final state of tc + Emiss T . Good agreement is found between the Standard Model expectation and the data in the search regions. Exclusion limits at 95% CL are obtained in the m( ˜t1) vs. m( ˜χ0 1) plane and, in addition, limits on the branching ratio of the ˜t1 → t ˜χ0 1 decay as a function of m( ˜t1) are also produced. Top-squark masses of up to 800 GeV are excluded for scenarios with light neutralinos, and top-squark masses up to 600 GeV are excluded in scenarios where the neutralino and the top squark are almost mass degenerate.
Beyond Standard Model; Hadron-Hadron Scattering; Supersymmetry
Settore FIS/01 - Fisica Sperimentale
Settore ING-INF/07 - Misure Elettriche e Elettroniche
2024
26-lug-2024
https://link.springer.com/article/10.1007/JHEP07(2024)250
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1085890
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