Measurement of the toverline{t}gamma production cross section in proton-proton collisions at sqrt{s}=8 TeV with the ATLAS detector

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Zhao,Z Zinonos,À Zoccoli ,Ø Dale ,Ç İşsever ,Š Todorova-Nová ,Š Valkár ,Τ Maier ,Κ Παπαγεωργίου ,А Антонов ,А Пури ,А Р Бузыкаев ,А С Кожин ,В Ф Казанин ,И И Цукерман ,И Н Александров ,П Б Шаталов

doi:10.1007/jhep11(2017)086

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 sqrt{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 pT > 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.

Highlights

Measurements of top-quark properties play an important role in testing the Standard Model (SM) and its possible extensions
6.1 Background from hadrons misidentified as photons The main background contribution to the ttγ process comes from hadrons, or photons from hadron decays, that are misidentified as prompt photons
While the results presented in ref. [9] were calculated at a centre-of-mass energy of s = 14 TeV, a dedicated calculation at s = 8 TeV has been performed in the singlelepton channel both at leading order (LO) and next-to-leading order (NLO) using the same techniques as in ref

Summary

Introduction

Measurements of top-quark properties play an important role in testing the Standard Model (SM) and its possible extensions. Studies of the production and dynamics of a top-quark pair in association with a photon (ttγ) probe the tγ electroweak coupling. Photons can originate from top quarks, and from their decay products, including the quarks and leptons from the decay of the W bosons. They can be radiated from incoming partons. This paper describes a measurement of the ttγ production cross section,√based on a data set recorded with the ATLAS detector in 2012 at a centre-of-mass energy of s = 8 TeV and corresponding to an integrated luminosity of 20.2 fb−1. Final states with exactly one reconstructed lepton (electron or muon), including those originating from τ lepton decays, are considered. The cross sections are compared to the theoretical calculations at next-to-leading order (NLO) [9] in the strong interaction

ATLAS detector

Data and simulation samples

Event reconstruction and selection

Event reconstruction

Event selection

Definition of the fiducial phase space

Templates

Hadronic-fake template

Electron-fake template

Background estimation

Background from electrons misidentified as photons

Background events with a prompt photon

Theoretical prediction

Fit strategy

Systematic uncertainties

Modelling uncertainties

Experimental uncertainties

Template-related uncertainties

Results

10 Conclusions

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Journal: Journal of High Energy Physics	Publication Date: Nov 1, 2017
Citations: 10	License type: open-access

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Measurement of the toverline{t}gamma production cross section in proton-proton collisions at sqrt{s}=8 TeV with the ATLAS detector

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Measurement of the toverline{t}gamma production cross section in proton-proton collisions at sqrt{s}=8 TeV with the ATLAS detector

Abstract

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Summary

Talk to us

Similar Papers

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