Title

# Measurement of the t t ¯ γ $$t\overline{t}\gamma$$ production cross section in proton-proton collisions at √s = 8 TeV with the ATLAS detector

CollaborationWith : Akilli, Ece / Ancu, Lucian Stefan / Benoit, Mathieu / Calace, Noemi / Clark, Allan Geoffrey / Coccaro, Andrea / Della Volpe, Domenico / Di Bello, Francesco / Dubreuil, Arnaud / Ferrere, Didier / Golling, Tobias / Gonzalez Sevilla, Sergio / Iacobucci, Giuseppe / Jansky, Roland / Katre, Akshay / Khoo, Teng Jian / Lanfermann, Marie Christine / Lionti, Anthony Eric / March Ruiz, Luis / Mermod, Philippe / Nackenhorst, Olaf / Nessi, Marzio / Paolozzi, Lorenzo / Schramm, Steven / Sfyrla, Anna / Wu, Xin
Published in Journal of High Energy Physics. 2017, vol. 1711, p. 086-129
Collection Open Access - SCOAP3
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 √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 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 ± 7 (stat.) ± 17 (syst.) fb, in good agreement with the theoretical prediction at next-to-leading order of 151 ± 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.
Identifiers
arXiv: 1706.03046
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ATLAS COLLABORATION. Measurement of the t t ¯ γ $$t\overline{t}\gamma$$ production cross section in proton-proton collisions at √s = 8 TeV with the ATLAS detector. In: Journal of High Energy Physics, 2017, vol. 1711, p. 086-129. https://archive-ouverte.unige.ch/unige:99916

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