Measurement of single top-quark production in association with a π‘Š boson in 𝑝⁒𝑝 collisions at βˆšπ‘  =13  TeV 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

Research output: Contribution to journal β€Ί Article β€Ί peer-review

Abstract

The inclusive cross section for the production of a single top quark in association with a π‘Š boson is measured using 140  fbβˆ’1 of proton-proton collision data collected with the ATLAS detector at βˆšπ‘  =13  TeV. Events containing two charged leptons and at least one jet identified as originating from a 𝑏-quark are selected. A multivariate discriminant is constructed to separate the π‘‘β’π‘Š signal from the 𝑑⁒¯𝑑 background. The cross section is extracted using a profile likelihood fit to the signal and control regions and it is measured to be πœŽπ‘‘β’π‘Š =7⁒5+15βˆ’14  pb, in good agreement with the Standard Model prediction. The measured cross section is used to extract a value for the left-handed form factor at the π‘Šβ’π‘‘β’π‘ vertex times the Cabibbo-Kobayashi-Maskawa matrix element |𝑓LV⁑𝑉𝑑⁒𝑏| of 0.97 Β±0.10.
Original languageEnglish
Article number072010
Pages (from-to)1-30
Number of pages30
JournalPhysical Review D
Volume110
Issue number7
DOIs
Publication statusPublished - 17 Oct 2024

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