Szczegóły publikacji

Opis bibliograficzny

Observation of top-quark pair production in association with a photon and measurement of the $t\bar{t} \gamma$ production cross section in pp collisions at $\sqrt{s}$=7 TeV using the ATLAS detector / G. Aad, [et al.], L. ADAMCZYK, [et al.], T. BOŁD, [et al.], W. DĄBROWSKI, [et al.], M. DWUŻNIK, M. DYNDAŁ, [et al.], I. GRABOWSKA-BOŁD, [et al.], D. KISIELEWSKA, [et al.], S. KOPERNY, [et al.], T. Z. KOWALSKI, [et al.], B. MINDUR, [et al.], M. PRZYBYCIEŃ, [et al.], A. ZEMŁA, [et al.] // Physical Review. D, Particles, fields, gravitation, and cosmology ; ISSN 1550-7998. — 2015 — vol. 91 iss. 7, s. 072007-1–072007-28. — Bibliogr. s. 072007-14–072007-15

Autorzy (3000)

Dane bibliometryczne

ID BaDAP89978
Data dodania do BaDAP2015-06-23
Tekst źródłowyURL
DOI10.1103/PhysRevD.91.072007
Rok publikacji2015
Typ publikacjiartykuł w czasopiśmie
Otwarty dostęptak
Czasopismo/seriaPhysical Review, D

Abstract

A search is performed for top-quark pairs (t (t) over bar) produced together with a photon (gamma) with transverse energy greater than 20 GeV using a sample of t (t) over bar 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 (t) over bar gamma candidate events are observed in the electron and muon channels, to be compared to the expectation of 79 +/- 26 and 120 +/- 39 non-t (t) over bar gamma background events, respectively. The production of t (t) over bar gamma events is observed with a significance of 5.3 standard deviations away from the null hypothesis. The t (t) over bar gamma 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 sigma(fid)(t (t) over bar gamma) x 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.

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