Measurement of the production cross-section of a single top quark in association with a W boson at 8 TeV with the ATLAS experiment

The cross-section for the production of a single top quark in association with a W boson in proton-proton collisions at √s = 8TeV is measured. The dataset corresponds to an integrated luminosity of 20.3 fb −1 , collected by the ATLAS detector in 2012 at the Large Hadron Collider at CERN. Events cont...

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Publicado:	2016
Materias:	Hadron-Hadron scattering Top physics
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11266708_v2016_n1_p1_TheATLAScollaboration http://hdl.handle.net/20.500.12110/paper_11266708_v2016_n1_p1_TheATLAScollaboration
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_11266708_v2016_n1_p1_TheATLAScollaboration
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spelling	paper:paper_11266708_v2016_n1_p1_TheATLAScollaboration2023-06-08T16:08:44Z Measurement of the production cross-section of a single top quark in association with a W boson at 8 TeV with the ATLAS experiment Hadron-Hadron scattering Top physics The cross-section for the production of a single top quark in association with a W boson in proton-proton collisions at √s = 8TeV is measured. The dataset corresponds to an integrated luminosity of 20.3 fb −1 , collected by the ATLAS detector in 2012 at the Large Hadron Collider at CERN. Events containing two leptons and one central b-jet are selected. The W t signal is separated from the backgrounds using boosted decision trees, each of which combines a number of discriminating variables into one classifier. Production of W t events is observed with a significance of 7.7σ. The cross-section is extracted in a profile likelihood fit to the classifier output distributions. The W t cross-section, inclusive of decay modes, is measured to be 23.0 ± 1.3(stat.) − 3.5 + 3.2 (syst.)±1.1(lumi.) pb. The measured cross-section is used to extract a value for the CKM matrix element \|V tb \| of 1.01 ± 0.10 and a lower limit of 0.80 at the 95% confidence level. The cross-section for the production of a top quark and a W boson is also measured in a fiducial acceptance requiring two leptons with p T > 25 GeV and \|η\| < 2.5, one jet with p T > 20 GeV and \|η\| < 2.5, and E T miss > 20 GeV, including both W t and top-quark pair events as signal. The measured value of the fiducial cross-section is 0.85 ± 0.01(stat.) − 0.07 + 0.07 (syst.)±0.03(lumi.) pb. © 2016, The Author(s). 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11266708_v2016_n1_p1_TheATLAScollaboration http://hdl.handle.net/20.500.12110/paper_11266708_v2016_n1_p1_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 Top physics
spellingShingle	Hadron-Hadron scattering Top physics Measurement of the production cross-section of a single top quark in association with a W boson at 8 TeV with the ATLAS experiment
topic_facet	Hadron-Hadron scattering Top physics
description	The cross-section for the production of a single top quark in association with a W boson in proton-proton collisions at √s = 8TeV is measured. The dataset corresponds to an integrated luminosity of 20.3 fb −1 , collected by the ATLAS detector in 2012 at the Large Hadron Collider at CERN. Events containing two leptons and one central b-jet are selected. The W t signal is separated from the backgrounds using boosted decision trees, each of which combines a number of discriminating variables into one classifier. Production of W t events is observed with a significance of 7.7σ. The cross-section is extracted in a profile likelihood fit to the classifier output distributions. The W t cross-section, inclusive of decay modes, is measured to be 23.0 ± 1.3(stat.) − 3.5 + 3.2 (syst.)±1.1(lumi.) pb. The measured cross-section is used to extract a value for the CKM matrix element \|V tb \| of 1.01 ± 0.10 and a lower limit of 0.80 at the 95% confidence level. The cross-section for the production of a top quark and a W boson is also measured in a fiducial acceptance requiring two leptons with p T > 25 GeV and \|η\| < 2.5, one jet with p T > 20 GeV and \|η\| < 2.5, and E T miss > 20 GeV, including both W t and top-quark pair events as signal. The measured value of the fiducial cross-section is 0.85 ± 0.01(stat.) − 0.07 + 0.07 (syst.)±0.03(lumi.) pb. © 2016, The Author(s).
title	Measurement of the production cross-section of a single top quark in association with a W boson at 8 TeV with the ATLAS experiment
title_short	Measurement of the production cross-section of a single top quark in association with a W boson at 8 TeV with the ATLAS experiment
title_full	Measurement of the production cross-section of a single top quark in association with a W boson at 8 TeV with the ATLAS experiment
title_fullStr	Measurement of the production cross-section of a single top quark in association with a W boson at 8 TeV with the ATLAS experiment
title_full_unstemmed	Measurement of the production cross-section of a single top quark in association with a W boson at 8 TeV with the ATLAS experiment
title_sort	measurement of the production cross-section of a single top quark in association with a w boson at 8 tev with the atlas experiment
publishDate	2016
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11266708_v2016_n1_p1_TheATLAScollaboration http://hdl.handle.net/20.500.12110/paper_11266708_v2016_n1_p1_TheATLAScollaboration
_version_	1768546361890832384

Measurement of the production cross-section of a single top quark in association with a W boson at 8 TeV with the ATLAS experiment

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