Measurement of the tt¯ γ production cross section in proton-proton collisions at √s=8 TeV with the ATLAS detector

Measurement of the tt¯ γ production cross section in proton-proton collisions at √s=8 TeV with the ATLAS detector

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 tha...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abidi, S.H, AbouZeid, O.S, Abraham, N.L, Abramowicz, H, Abreu, H, Abreu, R, Abulaiti, Y, Acharya, B.S, Adachi, S, Adamczyk, L, Adelman, J, Adersberger, M, Adye, T, Affolder, A.A, Agatonovic-Jovin, T, Agheorghiesei, C, Aguilar-Saavedra, J.A, Ahlen, S.P, Ahmadov, F, Aielli, G, Akatsuka, S, Akerstedt, H, Åkesson, T.PA, Akilli, E, Akimov, A.V, Alberghi, G.L, Albert, J, Albicocco, P, Alconada Verzini, M.J, Alderweireldt, S.C, Aleksa, M, Aleksandrov, I.N, Alexa, C, Alexander, G, Alexopoulos, T, Alhroob, M, Ali, B, Aliev, M, Alimonti, G, Alison, J, Alkire, S.P, Allbrooke, B.M.M, Allen, B.W, Allport, P.P, Aloisio, A, Alonso, A, Alonso, F, Alpigiani, C, Alshehri, A.A, Alstaty, M.I, Alvarez Gonzalez, B, Álvarez Piqueras, D, Alviggi, M.G, Amadio, B.T, Amaral Coutinho, Y, Amelung, C, Amidei, D, Amor Dos Santos, S.P, Amorim, A, Amoroso, S, Amundsen, G, Anastopoulos, C, Ancu, L.S, Andari, N, Andeen, T, Anders, C.F, Anders, J.K, Anderson, K.J, Andreazza, A, Andrei, V, Angelidakis, S, Angelozzi, I, Angerami, A, Anisenkov, A.V, Anjos, N, Annovi, A, Antel, C, Antonelli, M, Antonov, A, The ATLAS collaboration
Format: Artikel
Sprache:eng
Online-Zugang:Volltext bestellen
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung: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.
DOI:10.1007/JHEP11(2017)086