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- 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 fb<sup><bold>−</bold>1</sup> of pp collision data collected by the ATLAS detector.
- Authors
Aad, G.; Abbott, B.; Abeling, K.; Abicht, N. J.; Abidi, S. H.; Aboulhorma, A.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; Acharya, B. S.; Adam Bourdarios, C.; Adamczyk, L.; Addepalli, S. V.; Addison, M. J.; Adelman, J.; Adiguzel, A.; Adye, T.; Affolder, A. A.; Afik, Y.; Agaras, M. N.
- 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 t ~ 1 → c χ ~ 1 0 or t ~ 1 → t χ ~ 1 0 , where the χ ~ 1 0 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 + E T miss . 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 ~ 1 0 plane and, in addition, limits on the branching ratio of the t ~ 1 → t χ ~ 1 0 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.
- Publication
Journal of High Energy Physics, 2024, Vol 2024, Issue 7, p1
- ISSN
1126-6708
- Publication type
Article
- DOI
10.1007/JHEP07(2024)250