Observation of Single-Top-Quark Production in Association with a Photon Using the ATLAS Detector

• Author(s): Castro, Nuno Filipe ; Onofre, A. ; ATLAS Collaboration
• Date: 2023
• Persistent ID: https://hdl.handle.net/1822/87792
• Origin: RepositóriUM - Universidade do Minho
• Subject(s): Ciências Naturais::Ciências Físicas
• Document Type: Journal article
• Language: English
• Contributor(s): Universidade do Minho

Description

This Letter reports the observation of single top quarks produced together with a photon, which directly probes the electroweak coupling of the top quark. The analysis uses 139  fb^{-1} of 13 TeV proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider. Requiring a photon with transverse momentum larger than 20 GeV and within the detector acceptance, the fiducial cross section is measured to be 688±23(stat) _{-71}^{+75}(syst)  fb, to be compared with the standard model prediction of 515_{-42}^{+36}  fb at next-to-leading order in QCD.

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info:eu-repo/semantics/publishedVersion