Measurement of single top-quark production in the s-channel in proton-proton collisions at √s=13 TeV with the ATLAS detector



Aad, G, Abbott, B, Abbott, DC, Abeling, K, Abidi, SH, Aboulhorma, A, Abramowicz, H, Abreu, H, Abulaiti, Y, Abusleme Hoffman, AC
et al (show 2889 more authors) (2023) Measurement of single top-quark production in the s-channel in proton-proton collisions at √s=13 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2023 (6).

Access the full-text of this item by clicking on the Open Access link.

Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>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<jats:sup><jats:italic>−</jats:italic>1</jats:sup>. The analysis is performed on events with an electron or muon, missing transverse momentum and exactly two <jats:italic>b</jats:italic>-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 <jats:italic>W</jats:italic>-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 <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \sigma ={8.2}_{-2.9}^{+3.5} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>σ</mml:mi> <mml:mo>=</mml:mo> <mml:msubsup> <mml:mn>8.2</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>2.9</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>3.5</mml:mn> </mml:mrow> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> pb, consistent with the Standard Model prediction of <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\sigma}^{\textrm{SM}}={10.32}_{-0.36}^{+0.40} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>σ</mml:mi> <mml:mi>SM</mml:mi> </mml:msup> <mml:mo>=</mml:mo> <mml:msubsup> <mml:mn>10.32</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.36</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.40</mml:mn> </mml:mrow> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> pb.</jats:p>

Item Type: Article
Uncontrolled Keywords: Hadron-Hadron Scattering, Top Physics
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 25 Jul 2023 14:33
Last Modified: 12 Oct 2023 23:19
DOI: 10.1007/JHEP06(2023)191
Open Access URL: https://link.springer.com/article/10.1007/JHEP06(2...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3171899