Article detail · 2024
PHYSICAL REVIEW D
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A search is presented for direct pair production of the stop, the supersymmetric partner of the top quark, in a decay through an R -parity violating coupling to a charged lepton and a b -quark. The dataset corresponds to an integrated luminosity of 140 fb − 1 of proton-proton collisions at a center-of-mass energy of s = 13 TeV collected between 2015 and 2018 by the ATLAS detector at the LHC. The final state has two charged leptons (electrons or muons) and two b -jets. The results of the search are interpreted in the context of a Minimal Supersymmetric Standard Model with an additional B − L gauge symmetry that is spontaneously broken. No significant excess is observed over the Standard Model background, and exclusion limits on stop pair production are set at 95% confidence level. The corresponding lower limits on the stop mass for 100% branching ratios to a b -quark and an electron, muon, or tau-lepton are 1.9 TeV, 1.8 TeV and 800 GeV, respectively, extending the reach of previous LHC searches. © 2024 CERN, for the ATLAS Collaboration 2024 CERN
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