The Decay Rate Asymmetry of the Top Quark

Details The Decay Rate Asymmetry of the Top Quark The Decay Rate Asymmetry of the Top Quark

1993-10-14

arxiv.org/abs/hep-ph/9310286v1

Phys.Lett.B319:526-532,1993

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 3 figures (not included, postscript files available when requested). CERN-TH.6941/93,UICHEP-TH/93-15

Scientific paper

10.1016/0370-2693(93)91761-B

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.

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