Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector

This paper presents a measurement of the top quark pair (tt̄) production charge asymmetry AC using 4.7 fb -1 of proton-proton collisions at a centre-of-mass energy √s = 7TeV collected by the ATLAS detector at the LHC. A tt̄-enriched sample of events with a single lepton (electron or muon), missing t...

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Publicado: 2014
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Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11266708_v2014_n2_p_Aad
http://hdl.handle.net/20.500.12110/paper_11266708_v2014_n2_p_Aad
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spelling paper:paper_11266708_v2014_n2_p_Aad2023-06-08T16:08:29Z Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector Hadron-Hadron Scattering Top physics This paper presents a measurement of the top quark pair (tt̄) production charge asymmetry AC using 4.7 fb -1 of proton-proton collisions at a centre-of-mass energy √s = 7TeV collected by the ATLAS detector at the LHC. A tt̄-enriched sample of events with a single lepton (electron or muon), missing transverse momentum and at least four high transverse momentum jets, of which at least one is tagged as coming from a b-quark, is selected. A likelihood fit is used to reconstruct the tt̄ event kinematics. A Bayesian unfolding procedure is employed to estimate AC at the parton-level. The measured value of the tt̄ production charge asymmetry is AC = 0.006 ± 0.010, where the uncertainty includes both the statistical and the systematic components. Differential AC measurements as a function of the invariant mass, the rapidity and the transverse momentum of the tt̄- system are also presented. In addition, AC is measured for a subset of events with large tt̄ velocity, where physics beyond the Standard Model could contribute. All measurements are consistent with the Standard Model predictions. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11266708_v2014_n2_p_Aad http://hdl.handle.net/20.500.12110/paper_11266708_v2014_n2_p_Aad
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Hadron-Hadron Scattering
Top physics
spellingShingle Hadron-Hadron Scattering
Top physics
Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector
topic_facet Hadron-Hadron Scattering
Top physics
description This paper presents a measurement of the top quark pair (tt̄) production charge asymmetry AC using 4.7 fb -1 of proton-proton collisions at a centre-of-mass energy √s = 7TeV collected by the ATLAS detector at the LHC. A tt̄-enriched sample of events with a single lepton (electron or muon), missing transverse momentum and at least four high transverse momentum jets, of which at least one is tagged as coming from a b-quark, is selected. A likelihood fit is used to reconstruct the tt̄ event kinematics. A Bayesian unfolding procedure is employed to estimate AC at the parton-level. The measured value of the tt̄ production charge asymmetry is AC = 0.006 ± 0.010, where the uncertainty includes both the statistical and the systematic components. Differential AC measurements as a function of the invariant mass, the rapidity and the transverse momentum of the tt̄- system are also presented. In addition, AC is measured for a subset of events with large tt̄ velocity, where physics beyond the Standard Model could contribute. All measurements are consistent with the Standard Model predictions.
title Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector
title_short Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector
title_full Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector
title_fullStr Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector
title_full_unstemmed Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector
title_sort measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 tev using the atlas detector
publishDate 2014
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11266708_v2014_n2_p_Aad
http://hdl.handle.net/20.500.12110/paper_11266708_v2014_n2_p_Aad
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