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Article
Report number arXiv:2402.12137 ; CERN-EP-2023-262
Title A search for top-squark pair production, in final states containing a top quark, a charm quark and missing transverse momentum, using the 139 fb1 of pp collision data collected by the ATLAS detector
Author(s) ATLAS Collaboration  ყველა 2989 ავტორის ჩვენება
Corporate Author(s) ATLAS Collaboration
Publication 2024-07-26
Imprint 20 Feb 2024
Number of pages 48
Note 48 pages in total, author list starting page 31, 10 figures, 5 tables, published on Journal of High Energy Physics. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2019-23/
In: JHEP 2407 (2024) 250
DOI 10.1007/JHEP07(2024)250
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Free keywords supersymmetry ; particle and resonance production ; experimental results ; Supersymmetry stop quark search ; Stop decay to top or charm
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 corresponds to an integrated luminosity of 139fb1 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 t~1cχ~10 or t~1tχ~10, where the χ~10 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+ETmiss. 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(t~1) vs m(χ~10) plane and, in addition, limits on the branching ratio of the t~1tχ~10 decay as a function of m(t~1) 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.
Related document supersedes: ATLAS-CONF-2023-058
Copyright/License Publication: © 2024-2025 CERN (License: CC-BY-4.0), sponsored by SCOAP³
Preprint: © 2023-2025 CERN (License: CC-BY-4.0)



Corresponding record in: Inspire
Email contact: tatjana.lenz@cern.ch


 ჩანაწერი შექმნილია 2024-02-20, ბოლოს შესწორებულია 2024-12-25


სრული ტექსტი:
2402.12137 - სრული ტექსტის ჩამოტვირთვაPDF
document - სრული ტექსტის ჩამოტვირთვაPDF
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