Measurements of top quark spin observables in tt¯ events using dilepton final states in √s=8 TeV pp collisions with the ATLAS detector

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Measurements of top quark spin observables in tt¯ events are presented based on 20.2 fb −1 of s=8 TeV proton-proton collisions recorded with the ATLAS detector at the LHC. The analysis is performed in the dilepton final state, characterised by the presence of two isolated leptons (electrons or muons...

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Autor principal:	The ATLAS collaboration
Formato:	JOUR
Materias:	Hadron-Hadron scattering (experiments)
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_11266708_v2017_n3_p_TheATLAScollaboration
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_11266708_v2017_n3_p_TheATLAScollaboration
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spelling	todo:paper_11266708_v2017_n3_p_TheATLAScollaboration2023-10-03T16:07:34Z Measurements of top quark spin observables in tt¯ events using dilepton final states in √s=8 TeV pp collisions with the ATLAS detector The ATLAS collaboration Hadron-Hadron scattering (experiments) Measurements of top quark spin observables in tt¯ events are presented based on 20.2 fb −1 of s=8 TeV proton-proton collisions recorded with the ATLAS detector at the LHC. The analysis is performed in the dilepton final state, characterised by the presence of two isolated leptons (electrons or muons). There are 15 observables, each sensitive to a different coefficient of the spin density matrix of tt¯ production, which are measured independently. Ten of these observables are measured for the first time. All of them are corrected for detector resolution and acceptance effects back to the parton and stable-particle levels. The measured values of the observables at parton level are compared to Standard Model predictions at next-to-leading order in QCD. The corrected distributions at stable-particle level are presented and the means of the distributions are compared to Monte Carlo predictions. No significant deviation from the Standard Model is observed for any observable.[Figure not available: see fulltext.] © 2017, The Author(s). JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_11266708_v2017_n3_p_TheATLAScollaboration
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 (experiments)
spellingShingle	Hadron-Hadron scattering (experiments) The ATLAS collaboration Measurements of top quark spin observables in tt¯ events using dilepton final states in √s=8 TeV pp collisions with the ATLAS detector
topic_facet	Hadron-Hadron scattering (experiments)
description	Measurements of top quark spin observables in tt¯ events are presented based on 20.2 fb −1 of s=8 TeV proton-proton collisions recorded with the ATLAS detector at the LHC. The analysis is performed in the dilepton final state, characterised by the presence of two isolated leptons (electrons or muons). There are 15 observables, each sensitive to a different coefficient of the spin density matrix of tt¯ production, which are measured independently. Ten of these observables are measured for the first time. All of them are corrected for detector resolution and acceptance effects back to the parton and stable-particle levels. The measured values of the observables at parton level are compared to Standard Model predictions at next-to-leading order in QCD. The corrected distributions at stable-particle level are presented and the means of the distributions are compared to Monte Carlo predictions. No significant deviation from the Standard Model is observed for any observable.[Figure not available: see fulltext.] © 2017, The Author(s).
format	JOUR
author	The ATLAS collaboration
author_facet	The ATLAS collaboration
author_sort	The ATLAS collaboration
title	Measurements of top quark spin observables in tt¯ events using dilepton final states in √s=8 TeV pp collisions with the ATLAS detector
title_short	Measurements of top quark spin observables in tt¯ events using dilepton final states in √s=8 TeV pp collisions with the ATLAS detector
title_full	Measurements of top quark spin observables in tt¯ events using dilepton final states in √s=8 TeV pp collisions with the ATLAS detector
title_fullStr	Measurements of top quark spin observables in tt¯ events using dilepton final states in √s=8 TeV pp collisions with the ATLAS detector
title_full_unstemmed	Measurements of top quark spin observables in tt¯ events using dilepton final states in √s=8 TeV pp collisions with the ATLAS detector
title_sort	measurements of top quark spin observables in tt¯ events using dilepton final states in √s=8 tev pp collisions with the atlas detector
url	http://hdl.handle.net/20.500.12110/paper_11266708_v2017_n3_p_TheATLAScollaboration
work_keys_str_mv	AT theatlascollaboration measurementsoftopquarkspinobservablesintteventsusingdileptonfinalstatesins8tevppcollisionswiththeatlasdetector
_version_	1782025839961964544

Measurements of top quark spin observables in tt¯ events using dilepton final states in √s=8 TeV pp collisions with the ATLAS detector

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