Measurement of the t-channel single top-quark production cross section in pp collisions at s=7 TeV with the ATLAS detector

We report a measurement of the cross section of single top-quark production in the t-channel using 1.04 fb −1 of pp collision data at s=7 TeV recorded with the ATLAS detector at the LHC. Selected events feature one electron or muon, missing transverse momentum, and two or three jets, exactly one of...

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Autor principal:	Aad, G.
Formato:	JOUR
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_03702693_v717_n4-5_p330_Aad
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_03702693_v717_n4-5_p330_Aad
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spelling	todo:paper_03702693_v717_n4-5_p330_Aad2023-10-03T15:29:23Z Measurement of the t-channel single top-quark production cross section in pp collisions at s=7 TeV with the ATLAS detector Aad, G. We report a measurement of the cross section of single top-quark production in the t-channel using 1.04 fb −1 of pp collision data at s=7 TeV recorded with the ATLAS detector at the LHC. Selected events feature one electron or muon, missing transverse momentum, and two or three jets, exactly one of them identified as originating from a b quark. The cross section is measured by fitting the distribution of a multivariate discriminant constructed with a neural network, yielding σ t =83±4(stat.) −19 +20 (syst.) pb, which is in good agreement with the prediction of the Standard Model. Using the ratio of the measured to the theoretically predicted cross section and assuming that the top-quark-related CKM matrix elements obey the relation \|V tb \|≫\|V ts \|,\|V td \|, the coupling strength at the W-t-b vertex is determined to be \|V tb \|=1.13 −0.13 +0.14 . If it is assumed that \|V tb \|⩽1 a lower limit of \|V tb \|>0.75 is obtained at the 95% confidence level. © 2012 CERN JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03702693_v717_n4-5_p330_Aad
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description	We report a measurement of the cross section of single top-quark production in the t-channel using 1.04 fb −1 of pp collision data at s=7 TeV recorded with the ATLAS detector at the LHC. Selected events feature one electron or muon, missing transverse momentum, and two or three jets, exactly one of them identified as originating from a b quark. The cross section is measured by fitting the distribution of a multivariate discriminant constructed with a neural network, yielding σ t =83±4(stat.) −19 +20 (syst.) pb, which is in good agreement with the prediction of the Standard Model. Using the ratio of the measured to the theoretically predicted cross section and assuming that the top-quark-related CKM matrix elements obey the relation \|V tb \|≫\|V ts \|,\|V td \|, the coupling strength at the W-t-b vertex is determined to be \|V tb \|=1.13 −0.13 +0.14 . If it is assumed that \|V tb \|⩽1 a lower limit of \|V tb \|>0.75 is obtained at the 95% confidence level. © 2012 CERN
format	JOUR
author	Aad, G.
spellingShingle	Aad, G. Measurement of the t-channel single top-quark production cross section in pp collisions at s=7 TeV with the ATLAS detector
author_facet	Aad, G.
author_sort	Aad, G.
title	Measurement of the t-channel single top-quark production cross section in pp collisions at s=7 TeV with the ATLAS detector
title_short	Measurement of the t-channel single top-quark production cross section in pp collisions at s=7 TeV with the ATLAS detector
title_full	Measurement of the t-channel single top-quark production cross section in pp collisions at s=7 TeV with the ATLAS detector
title_fullStr	Measurement of the t-channel single top-quark production cross section in pp collisions at s=7 TeV with the ATLAS detector
title_full_unstemmed	Measurement of the t-channel single top-quark production cross section in pp collisions at s=7 TeV with the ATLAS detector
title_sort	measurement of the t-channel single top-quark production cross section in pp collisions at s=7 tev with the atlas detector
url	http://hdl.handle.net/20.500.12110/paper_03702693_v717_n4-5_p330_Aad
work_keys_str_mv	AT aadg measurementofthetchannelsingletopquarkproductioncrosssectioninppcollisionsats7tevwiththeatlasdetector
_version_	1807321041927667712

Measurement of the t-channel single top-quark production cross section in pp collisions at s=7 TeV with the ATLAS detector

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