Observation of single-top-quark production in association with a photon using the ATLAS detector

The ATLAS collaboration
Phys.Rev.Lett. 131 (2023) 181901, 2023.

Abstract (data abstract)
Observation of single-top-quark production in association with a photon using the ATLAS detector This Letter reports the observation of single top quarks produced together with a photon using $139\,$fb$^{-1}$ of $13\,$TeV proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider. The analysis uses the presence of a forward jet, characteristic of $t$-channel production, and separates the signal from the background with neural networks. Requiring a photon with transverse momentum larger than $20\,$GeV and within the detector acceptance, the fiducial cross section is measured to be $688\,\pm\,23 \, \mathrm{(stat.)} \, ^{+75}_{-71} \, \mathrm{(syst.)}\,$fb, to be compared with the Standard Model prediction of $515\,^{+36}_{-42}\,$fb at next-to-leading order in QCD.

workspace_particleLevel.json

License: CC0

Archive of full likelihood from the model for the particle level fiducial cross section measurement in the HistFactory JSON format described in ATL-PHYS-PUB-2019-029 stored in 'workspace_particleLevel.json' file

This file (1.37 MB) is larger than our loading threshold (1.00 MB), and is only available for download below.

Download via DOI: curl -OJLH "Accept: application/json" https://doi.org/10.17182/hepdata.134244.v1/r2

Download