Measurement of the <i>t(t)over-bar</i>γ production cross section in proton-proton collisions at √<i>s</i>=8 TeV with the ATLAS detector



Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H
et al (show 2863 more authors) (2017) Measurement of the <i>t(t)over-bar</i>γ production cross section in proton-proton collisions at √<i>s</i>=8 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 11 (11). 086-.

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Abstract

The cross section of a top-quark pair produced in association with a photon is measured in proton-proton collisions at a centre-of-mass energy of $\sqrt{s} = 8$ TeV with $20.2$ fb$^{-1}$ of data collected by the ATLAS detector at the Large Hadron Collider in 2012. The measurement is performed by selecting events that contain a photon with transverse momentum $p_\mathrm{T} > 15$ GeV, an isolated lepton with large transverse momentum, large missing transverse momentum, and at least four jets, where at least one is identified as originating from a $b$-quark. The production cross section is measured in a fiducial region close to the selection requirements. It is found to be $139 \pm 7 (\mathrm{stat.}) \pm 17 (\mathrm{syst.})$ fb, in good agreement with the theoretical prediction at next-to-leading order of $151 \pm 24$ fb. In addition, differential cross sections in the fiducial region are measured as a function of the transverse momentum and pseudorapidity of the photon.

Item Type: Article
Additional Information: 41 pages in total, author list starting page 25, 4 figures, 3 tables, submitted to JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2015-21/
Uncontrolled Keywords: Hadron-Hadron scattering (experiments), Top physics
Depositing User: Symplectic Admin
Date Deposited: 18 Dec 2017 09:05
Last Modified: 17 Oct 2023 19:25
DOI: 10.1007/JHEP11(2017)086
Open Access URL: http://doi.org/10.1007/JHEP11(2017)086
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3014287