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A search for top-sq...
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
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- Aad, G. (författare)
- CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France
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- $$$Leopold, A. (författare)
- Department of Physics, Royal Institute of Technology, Stockholm, Sweden
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- $$$Lundberg, O. (författare)
- Department of Physics, Royal Institute of Technology, Stockholm, Sweden
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- $$$Lund-Jensen, B. (författare)
- Department of Physics, Royal Institute of Technology, Stockholm, Sweden
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- $$$Ohm, C. C. (författare)
- Department of Physics, Royal Institute of Technology, Stockholm, Sweden
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- $$$Shaheen, R. (författare)
- Department of Physics, Royal Institute of Technology, Stockholm, Sweden
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- $$$Strandberg, J. (författare)
- Department of Physics, Royal Institute of Technology, Stockholm, Sweden
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- Zwalinski, L. (författare)
- CERN, Geneva, Switzerland
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et al., (författare)
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(creator_code:org_t)
- Springer Science and Business Media Deutschland GmbH, 2024
- 2024
- Engelska.
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Ingår i: Journal of High Energy Physics (JHEP). - : Springer Science and Business Media Deutschland GmbH. - 1126-6708 .- 1029-8479. ; 2024:7
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
Nyckelord
- Beyond Standard Model
- Hadron-Hadron Scattering
- Supersymmetry
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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