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Abstract:

This Letter presents evidence for the associated production of a W boson and a top quark using 2.05 fb −1 of pp collision data at s=7TeV accumulated with the ATLAS detector at the LHC. The analysis is based on the selection of the dileptonic final states with events featuring two isolated leptons, electron or muon, with significant transverse missing momentum and at least one jet. An approach based on boosted decision trees has been developed to improve the discrimination of single top-quark Wt events from background. A template fit to the final classifier distributions is performed to determine the cross-section. The result is incompatible with the background-only hypothesis at the 3.3σ level, the expected sensitivity assuming the Standard Model production rate being 3.4σ. The corresponding cross-section is determined and found to be σ Wt =16.8±2.9 (stat)±4.9 (syst) pb, in good agreement with the Standard Model expectation. From this result the CKM matrix element |V tb |=1.03 −0.19 +0.16 is derived assuming that the Wt production through |V ts | and |V td | is small. © 2012 CERN

Registro:

Documento: Artículo
Título:Evidence for the associated production of a W boson and a top quark in ATLAS at √s=7TeV
Autor:Aad, G. et al.
Este artículo contiene 2869 autores, consultelos en el artículo en formato pdf.
Filiación: Este artículo contiene 2869 autores con sus filiaciones, consultelas en el artículo en formato pdf.
Palabras clave:ATLAS; Single top-quark; Top quark; W+t
Año:2012
Volumen:716
Número:1
Página de inicio:142
Página de fin:159
DOI: http://dx.doi.org/10.1016/j.physletb.2012.08.011
Título revista:Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Título revista abreviado:Phys Lett Sect B Nucl Elem Part High-Energy Phys
ISSN:03702693
CODEN:PYLBA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v716_n1_p142_Aad

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Citas:

---------- APA ----------
(2012) . Evidence for the associated production of a W boson and a top quark in ATLAS at √s=7TeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 716(1), 142-159.
http://dx.doi.org/10.1016/j.physletb.2012.08.011
---------- CHICAGO ----------
Aad, G. "Evidence for the associated production of a W boson and a top quark in ATLAS at √s=7TeV" . Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 716, no. 1 (2012) : 142-159.
http://dx.doi.org/10.1016/j.physletb.2012.08.011
---------- MLA ----------
Aad, G. "Evidence for the associated production of a W boson and a top quark in ATLAS at √s=7TeV" . Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 716, no. 1, 2012, pp. 142-159.
http://dx.doi.org/10.1016/j.physletb.2012.08.011
---------- VANCOUVER ----------
Aad, G. Evidence for the associated production of a W boson and a top quark in ATLAS at √s=7TeV. Phys Lett Sect B Nucl Elem Part High-Energy Phys. 2012;716(1):142-159.
http://dx.doi.org/10.1016/j.physletb.2012.08.011