WFRF:(Shaheen Rabia)
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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. (author)
- CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France
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- Åkesson, T.P.A. (author)
- Lund University,Lunds universitet,Partikel- och kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Particle and nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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- Doglioni, C. (author)
- Lund University,Lunds universitet,Partikel- och kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Particle and nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,University of Manchester
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- (creator_code:org_t)
- Springer Nature, 2024
- 2024
- English.
- In: Journal of High Energy Physics. - : Springer Nature. - 1029-8479 .- 1126-6708. ; 2024:7
- Journal article (peer-reviewed)
Abstract
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- 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. © The Author(s) 2024.
Subject headings
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
Keyword
- Beyond Standard Model
- Hadron-Hadron Scattering
- Supersymmetry
- Beyond Standard Model
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- art (subject category)
- ref (subject category)
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- Aad, G.
- Åkesson, T.P.A.
- Doglioni, C.
- Ekman, P.A.
- Hedberg, V.
- Herde, H.
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- Konya, B.
- Lytken, E.
- Poettgen, R.
- Simpson, N.D.
- Smirnova, O.
- Zwalinski, L.
- Lundberg, Olof
- Lund-Jensen, Ben ...
- Ohm, Christian
- Shaheen, Rabia
- Strandberg, Jona ...
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