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 = 8 TeV 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 conta...
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2016
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Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/79232 |
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I19-R120-10915-79232 |
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institution |
Universidad Nacional de La Plata |
institution_str |
I-19 |
repository_str |
R-120 |
collection |
SEDICI (UNLP) |
language |
Inglés |
topic |
Ciencias Exactas Física hadron-hadron scattering top physics top quark w boson proton-proton collisions |
spellingShingle |
Ciencias Exactas Física hadron-hadron scattering top physics top quark w boson proton-proton collisions Alconada Verzini, María Josefina Alonso, Francisco Arduh, Francisco Anuar Dova, María Teresa Monticelli, Fernando Gabriel Wahlberg, Hernán Pablo The ATLAS Collaboration 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 |
Ciencias Exactas Física hadron-hadron scattering top physics top quark w boson proton-proton collisions |
description |
The cross-section for the production of a single top quark in association with a W boson in proton-proton collisions at √s = 8 TeV 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 Wt signal is separated from the backgrounds using boosted decision trees, each of which combines a number of discriminating variables into one classifier. Production of Wt 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 Wt cross-section, inclusive of decay modes, is measured to be 23.0±1.3 (stat.)+3.2 -3.5 (syst.) ±1.1(lumi.) pb. The measured cross-section is used to extract a value for the CKM matrix element |Vtb| 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 pT > 25 GeV and |η| < 2:5, one jet with pT > 20 GeV and |η| < 2:5, and Emiss T > 20 GeV, including both Wt and top-quark pair events as signal. The measured value of the fiducial cross-section is 0.85±0.01(stat.)+0.06 -0.07(syst.)± 0.03(lumi.) pb. |
format |
Articulo Articulo |
author |
Alconada Verzini, María Josefina Alonso, Francisco Arduh, Francisco Anuar Dova, María Teresa Monticelli, Fernando Gabriel Wahlberg, Hernán Pablo The ATLAS Collaboration |
author_facet |
Alconada Verzini, María Josefina Alonso, Francisco Arduh, Francisco Anuar Dova, María Teresa Monticelli, Fernando Gabriel Wahlberg, Hernán Pablo The ATLAS Collaboration |
author_sort |
Alconada Verzini, María Josefina |
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 |
http://sedici.unlp.edu.ar/handle/10915/79232 |
work_keys_str_mv |
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Repositorios |
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1764820486400770049 |