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...

Descripción completa

Guardado en:
Detalles Bibliográficos
Publicado: 2012
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v717_n4-5_p330_Aad
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 paper:paper_03702693_v717_n4-5_p330_Aad
record_format dspace
spelling paper:paper_03702693_v717_n4-5_p330_Aad2023-06-08T15:37:07Z 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 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 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v717_n4-5_p330_Aad 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
title Measurement of the t-channel single top-quark production cross section in pp collisions at s=7 TeV with the ATLAS detector
spellingShingle 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
publishDate 2012
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v717_n4-5_p330_Aad
http://hdl.handle.net/20.500.12110/paper_03702693_v717_n4-5_p330_Aad
_version_ 1768545145942179840

Ejemplares similares