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

Aad, G. (author): CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France

$$$Leopold, A. (author): Department of Physics, Royal Institute of Technology, Stockholm, Sweden

$$$Lundberg, O. (author): Department of Physics, Royal Institute of Technology, Stockholm, Sweden

$$$Lund-Jensen, B. (author): Department of Physics, Royal Institute of Technology, Stockholm, Sweden

$$$Ohm, C. C. (author): Department of Physics, Royal Institute of Technology, Stockholm, Sweden

$$$Shaheen, R. (author): Department of Physics, Royal Institute of Technology, Stockholm, Sweden

$$$Strandberg, J. (author): Department of Physics, Royal Institute of Technology, Stockholm, Sweden

et al., (author)

(creator_code:org_t)

Springer Science and Business Media Deutschland GmbH, 2024
2024
English.
In: Journal of High Energy Physics (JHEP). - : Springer Science and Business Media Deutschland GmbH. - 1126-6708 .- 1029-8479. ; 2024:7

Related links:: https://urn.kb.se/re...; show more...; https://doi.org/10.1...; show less...

Abstract Subject headings

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→cχ~10 or t~1→tχ~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 mt~1 vs. mχ~10 plane and, in addition, limits on the branching ratio of the t~1→tχ~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.

By the author/editor: Aad, G.; $$$Leopold, A.; $$$Lundberg, O.; $$$Lund-Jensen, ...; $$$Ohm, C. C.; $$$Shaheen, R.; show more...; $$$Strandberg, J ...; Zwalinski, L.; et al.,; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Subatomic Physic ...

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