Search for 𝑅-parity violating supersymmetric decays of the top squark to a 𝑏-jet and a lepton in βˆšπ‘  =13  TeV 𝑝⁒𝑝 collisions with the ATLAS detector

ATLAS Collaboration, S. Alderweireldt, J.F. Allen, T.M. Carter, P. J. Clark, J.R. Curran, D. Duda, S. M. Farrington, Y. Gao, J.M. Gargan, R.Y. Gonzalez Andana, C. Jiang, C. Leonidopoulos, M. Firdaus M. Soberi, V. J. Martin, L. Mijović, V.A. Parrish, E.A. Pender, T. Qiu, J.M. SilvaN. Themistokleous, F. Ustuner, E.M. Villhauer, B.M. Wynne, Z. Xu, E. Zaid

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Abstract

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  fbβˆ’1 of proton-proton collisions at a center-of-mass energy of βˆšπ‘  =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 𝐡 βˆ’πΏ 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.
Original languageEnglish
Article number092004
Pages (from-to)1-32
Number of pages32
JournalPhysical Review D
Volume110
Issue number9
Early online date1 Nov 2024
DOIs
Publication statusPublished - 12 Nov 2024

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