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Scientific article
Open access
English

Measurement of single top-quark production in the s-channel in proton–proton collisions at \sqrt{s} = 13 TeV with the ATLAS detector

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 2023, 191
Publication date2023
First online date2023-06-27
Abstract

A measurement of single top-quark production in the s-channel is performed in proton–proton collisions at a centre-of-mass energy of 13 TeV with the ATLAS detector at the CERN Large Hadron Collider. The dataset corresponds to an integrated luminosity of 139 fb$^{−1}$. The analysis is performed on events with an electron or muon, missing transverse momentum and exactly two b-tagged jets in the final state. A discriminant based on matrix element calculations is used to separate single-top-quark s-channel events from the main background contributions, which are top-quark pair production and W-boson production in association with jets. The observed (expected) signal significance over the background-only hypothesis is 3.3 (3.9) standard deviations, and the measured cross-section is $ \sigma ={8.2}_{-2.9}^{+3.5} $ pb, consistent with the Standard Model prediction of $ {\sigma}^{\textrm{SM}}={10.32}_{-0.36}^{+0.40} $ pb.

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Keywords
  • Hadron-Hadron Scattering
  • Top Physics
  • P p: scattering
  • P p: colliding beams
  • Top: single production
  • Top: pair production
  • Transverse momentum: missing-energy
  • Channel cross section: measured
  • ATLAS
  • Final state: ((n)jet lepton)
  • Muon
  • CERN Lab
  • Electron
  • CERN LHC Coll
  • Background
  • Data analysis method
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Measurement of single top-quark production in the s-channel in proton–proton collisions at <i> \sqrt{s} </i> = 13 TeV with the ATLAS detector. In: The journal of high energy physics, 2023, vol. 2023, p. 191. doi: 10.1007/jhep06(2023)191
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ISSN of the journal1029-8479
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