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A search for top-squark pair production, in fnal 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 ATLAS Collaboration
Abstract
This paper presents a search for top-squark pair production in fnal 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 favour violation in the second- and third-generation squark sector. The top squark in this model has two possible decay modes, either t˜1 → cχ˜ 0 1 or t˜1 → tχ˜ 0 1 , where the χ˜ 0 1 is undetected. The analysis is optimised assuming that both of the decay modes are equally probable, leading to the most likely fnal state of tc + Emiss T . 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˜ 0 1 ) plane and, in addition, limits on the branching ratio of the t˜1 → tχ˜ 0 1 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.
Item Metadata
Title |
A search for top-squark pair production, in fnal 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
|
Creator | |
Publisher |
Springer Berlin Heidelberg
|
Date Issued |
2024-07-26
|
Description |
This paper presents a search for top-squark pair production in fnal 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
favour violation in the second- and third-generation squark sector. The top squark in this
model has two possible decay modes, either t˜1 → cχ˜
0
1
or t˜1 → tχ˜
0
1
, where the χ˜
0
1
is undetected.
The analysis is optimised assuming that both of the decay modes are equally probable, leading
to the most likely fnal state of tc + Emiss
T
. 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˜
0
1
) plane and, in addition, limits on the branching ratio of the
t˜1 → tχ˜
0
1 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.
|
Subject | |
Genre | |
Type | |
Language |
eng
|
Date Available |
2024-10-24
|
Provider |
Vancouver : University of British Columbia Library
|
Rights |
Attribution 4.0 International (CC BY 4.0)
|
DOI |
10.14288/1.0447112
|
URI | |
Affiliation | |
Citation |
Journal of High Energy Physics. 2024 Jul 26;2024(7):250
|
Publisher DOI |
10.1007/JHEP07(2024)250
|
Peer Review Status |
Reviewed
|
Scholarly Level |
Faculty
|
Copyright Holder |
The Author(s)
|
Rights URI | |
Aggregated Source Repository |
DSpace
|
Item Media
Item Citations and Data
Rights
Attribution 4.0 International (CC BY 4.0)