$ O(α_s) $ corrections to polarized top decay into a charged Higgs $ t(\uparrow) \to H^+ + b $

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

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24 pages, 5 figures in the text, content modified, comments added, appendices added, references updated, replaced with publish

Scientific paper

10.1140/epjc/s10052-007-0510-5

We calculate the $ O(\alpha_s) $ radiative corrections to polarized top quark decay into a charged Higgs boson and a massive bottom quark in two variants of the two-Higgs-doublet model. The radiative corrections to the polarization asymmetry of the decay may become as large as $ 25 % $. We provide analytical formulae for the unpolarized and polarized rates for $ m_b \neq 0 $ and for $ m_b = 0 $. For $ m_b = 0 $ our closed-form expressions for the unpolarized and polarized rates become rather compact.

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