CP violation in t → W
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b decays in two-Higgs doublet model |
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Authors: | Tsutom Hasuikea Toshihiko Hattori Toshio Hayashi Seiichi Wakaizumi |
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Institution: | 115. Department of Physics, Anan College of Technology, Anan, 774, Japan 215. Institute of Theoretical Physics, University of Tokushima, Tokushima, 770, Japan 315. Department of Physics, University of Kagawa, Takamatsu, 760, Japan 415. School of Medical Sciences, University of Tokushima, Tokushima, 770, Japan
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Abstract: | Due to the large mass of top quark, CP violation in the top-quark decay is sensitive to the interactions mediated by Higgs bosons. We consider CP violation in t → W + b decay by calculating consistently in unitary gauge the CP-violating up-down asymmetry of the leptons from W boson decays in t → W + b, defined by Grz?dkowski and Gunion, in the two-Higgs doublet model with CP-violating neutral sector. The asymmetry is shown to be at most of the order of (1–4) × 10-4 for tan β = 1.0, where tan β is the ratio of vacuum expectation values for the two neutral Higgs bosons. |
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