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Abstract:

A search is performed for top-quark pairs (tt¯) produced together with a photon (γ) with transverse energy greater than 20 GeV using a sample of tt¯ candidate events in final states with jets, missing transverse momentum, and one isolated electron or muon. The data set used corresponds to an integrated luminosity of 4.59 fb-1 of proton-proton collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. In total, 140 and 222 tt¯γ candidate events are observed in the electron and muon channels, to be compared to the expectation of 79±26 and 120±39 non-tt¯γ background events, respectively. The production of tt¯γ events is observed with a significance of 5.3 standard deviations away from the null hypothesis. The tt¯γ production cross section times the branching ratio (BR) of the single-lepton decay channel is measured in a fiducial kinematic region within the ATLAS acceptance. The measured value is σtt¯γfid×BR=63±8(stat)-13+17(syst)±1(lumi) fb per lepton flavor, in good agreement with the leading-order theoretical calculation normalized to the next-to-leading-order theoretical prediction of 48±10 fb. © 2015 CERN. © 2015 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the »http://creativecommons.org/licenses/by/3.0/» Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Registro:

Documento: Artículo
Título:Observation of top-quark pair production in association with a photon and measurement of the t t ¯ γ production cross section in pp collisions at √s =7 TeV using the ATLAS detector
Autor:Aad, G. et al.
Este artículo contiene 2881 autores, consultelos en el artículo en formato pdf.
Filiación: Este artículo contiene 2881 autores con sus filiaciones, consultelas en el artículo en formato pdf.
Año:2015
Volumen:91
Número:7
DOI: http://dx.doi.org/10.1103/PhysRevD.91.072007
Título revista:Physical Review D - Particles, Fields, Gravitation and Cosmology
Título revista abreviado:Phys Rev D Part Fields Gravit Cosmol
ISSN:15507998
CODEN:PRVDA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v91_n7_p_Aad

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Citas:

---------- APA ----------
(2015) . Observation of top-quark pair production in association with a photon and measurement of the t t ¯ γ production cross section in pp collisions at √s =7 TeV using the ATLAS detector. Physical Review D - Particles, Fields, Gravitation and Cosmology, 91(7).
http://dx.doi.org/10.1103/PhysRevD.91.072007
---------- CHICAGO ----------
Aad, G. "Observation of top-quark pair production in association with a photon and measurement of the t t ¯ γ production cross section in pp collisions at √s =7 TeV using the ATLAS detector" . Physical Review D - Particles, Fields, Gravitation and Cosmology 91, no. 7 (2015).
http://dx.doi.org/10.1103/PhysRevD.91.072007
---------- MLA ----------
Aad, G. "Observation of top-quark pair production in association with a photon and measurement of the t t ¯ γ production cross section in pp collisions at √s =7 TeV using the ATLAS detector" . Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 91, no. 7, 2015.
http://dx.doi.org/10.1103/PhysRevD.91.072007
---------- VANCOUVER ----------
Aad, G. Observation of top-quark pair production in association with a photon and measurement of the t t ¯ γ production cross section in pp collisions at √s =7 TeV using the ATLAS detector. Phys Rev D Part Fields Gravit Cosmol. 2015;91(7).
http://dx.doi.org/10.1103/PhysRevD.91.072007