Observation of top-quark pair production in association with a photon and measurement of the tt¯γ production cross section in pp collisions at √s =7 TeV using the ATLAS detector

doi:10.1103/PhysRevD.91.072007

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Title: Observation of top-quark pair production in association with a photon and measurement of the tt¯γ production cross section in pp collisions at √s =7 TeV using the ATLAS detector
Creator: Aad, G.
Creator: Abdallah, J.
Creator: Chelkov, G. A.
Creator: Abbott, B.
Contributor: Томский государственный университет Радиофизический факультет Научные подразделения РФФ
Subject: ATLAS, детектор
Большой адронный коллайдер
фотоны
столкновение частиц
Date: 2015
DOI: 10.1103/PhysRevD.91.072007
Description: A search is performed for top-quark pairs (t¯t) produced together with a photon (γ) with transverse energy greater than 20 GeV using a sample of t¯t 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 t¯tγ candidate events are observed in the electron and muon channels, to be compared to the expectation of 79 26 and 120 39 non-t¯tγ background events, respectively. The production of t¯tγ events is observed with a significance of 5.3 standard deviations away from the null hypothesis. The t¯tγ 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 σfid t¯tγ × BR ¼ 63 8ðstatÞþ17 −13 ðsystÞ 1ðlumiÞ fb per lepton flavor, in good agreement with the leadingorder theoretical calculation normalized to the next-to-leading-order theoretical prediction of 48 10 fb.

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collection(s): Радиофизический факультет
Identifier: vtls:000526157
http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000526157
Type: статьи в журналах
Source: Physical Review D. 2015. Vol. 91, № 7. 072007-1-072007-28
Language: eng

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Радиофизический факультет Observation of top-quark pair production in association with a photon and measurement of the tt¯γ production cross section in pp collisions at √s =7 TeV using the ATLAS detector