The decay rate asymmetry of the top quark

The asymmetries ${\cal A}_k \equiv [\Gamma(\twddec) -\Gamma(\tbwddec)] /[\Gamma(\twddec) + \Gamma(\tbwddec)]$ in the partial widths of the top quark decays are discussed within the Standard Model (SM), the Two-Higgs-Doublet Model (2HDM) and supersymmetric extensions of the SM (SSM). The leading cont...

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Detalles Bibliográficos
Autores principales: Grzadkowski, Bohdan, Keung, Wai-Yee
Lenguaje:eng
Publicado: 1993
Materias:
Particle Physics - Theory
Acceso en línea:https://dx.doi.org/10.1016/0370-2693(93)91761-B
http://cds.cern.ch/record/254563
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author Grzadkowski, Bohdan
Keung, Wai-Yee
author_facet Grzadkowski, Bohdan
Keung, Wai-Yee
author_sort Grzadkowski, Bohdan
collection CERN
description The asymmetries ${\cal A}_k \equiv [\Gamma(\twddec) -\Gamma(\tbwddec)] /[\Gamma(\twddec) + \Gamma(\tbwddec)]$ in the partial widths of the top quark decays are discussed within the Standard Model (SM), the Two-Higgs-Doublet Model (2HDM) and supersymmetric extensions of the SM (SSM). The leading contributions to these asymmetries in the SM and in the 2HDM are induced by the up-type quark self-energy diagrams and are found to be very small. However, in the SSM, the asymmetry ${\cal A}_b$ can be substantial, ${\cal O}(\alpha_{QCD})$, provided the CP-violating phase of gluino-top-stop couplings is not suppressed. Within the SSM ${\cal A}_b$ is generated by the vertex corrections.
id cern-254563
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1993
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spelling cern-2545632023-03-14T19:27:14Zdoi:10.1016/0370-2693(93)91761-Bhttp://cds.cern.ch/record/254563engGrzadkowski, BohdanKeung, Wai-YeeThe decay rate asymmetry of the top quarkParticle Physics - TheoryThe asymmetries ${\cal A}_k \equiv [\Gamma(\twddec) -\Gamma(\tbwddec)] /[\Gamma(\twddec) + \Gamma(\tbwddec)]$ in the partial widths of the top quark decays are discussed within the Standard Model (SM), the Two-Higgs-Doublet Model (2HDM) and supersymmetric extensions of the SM (SSM). The leading contributions to these asymmetries in the SM and in the 2HDM are induced by the up-type quark self-energy diagrams and are found to be very small. However, in the SSM, the asymmetry ${\cal A}_b$ can be substantial, ${\cal O}(\alpha_{QCD})$, provided the CP-violating phase of gluino-top-stop couplings is not suppressed. Within the SSM ${\cal A}_b$ is generated by the vertex corrections.The asymmetries ${\cal A}_k \equiv [\Gamma(\twddec) -\Gamma(\tbwddec)] /[\Gamma(\twddec) + \Gamma(\tbwddec)]$ in the partial widths of the top quark decays are discussed within the Standard Model (SM), the Two-Higgs-Doublet Model (2HDM) and supersymmetric extensions of the SM (SSM). The leading contributions to these asymmetries in the SM and in the 2HDM are induced by the up-type quark self-energy diagrams and are found to be very small. However, in the SSM, the asymmetry ${\cal A}_b$ can be substantial, ${\cal O}(\alpha_{QCD})$, provided the CP-violating phase of gluino-top-stop couplings is not suppressed. Within the SSM ${\cal A}_b$ is generated by the vertex corrections.The asymmetries A k ≡[Γ(t→W + d k )−Γ( t →W − d k )] [Γ(t→W + d k )+Γ( t →W − d k )] in the partial widths of the top quark decays are discussed within the Standard Model (SM), the Two-Higgs-Doublet Model (2HDM) and supersymmetric extensions of the SM (SSM). The leading contributions to these asymmetries in the SM and in the 2HDM are induced by the up-type quark self-energy diagrams and are found to be very small. However, in the SSM, the asymmetry A b can be substantial, O (α QCD ) , provided the CP -violating phase of gluino-top-stop couplings is not suppressed. Within the SSM A b is generated by the vertex corrections.hep-ph/9310286CERN-TH-6941-93UICHEP-TH-93-15CERN-TH-6941-93UICHEP-TH-93-15oai:cds.cern.ch:2545631993
spellingShingle Particle Physics - Theory
Grzadkowski, Bohdan
Keung, Wai-Yee
The decay rate asymmetry of the top quark
title The decay rate asymmetry of the top quark
title_full The decay rate asymmetry of the top quark
title_fullStr The decay rate asymmetry of the top quark
title_full_unstemmed The decay rate asymmetry of the top quark
title_short The decay rate asymmetry of the top quark
title_sort decay rate asymmetry of the top quark
topic Particle Physics - Theory
url https://dx.doi.org/10.1016/0370-2693(93)91761-B
http://cds.cern.ch/record/254563
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