Eur. Phys. J. C (2008) 54: 175-185
https://doi.org/10.1140/epjc/s10052-007-0510-5

Regular Article - Theoretical Physics

O(α_s) corrections to polarized top quark decay into a charged Higgs boson:

Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudinger Weg 7, 55099, Mainz, Germany

^* e-mail: alimjan@thep.physik.uni-mainz.de

Received: 10 October 2007
Published online: 24 January 2008

Abstract

We calculate the O(α_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≠0 and for m_b=0. For m_b=0 our closed-form expressions for the unpolarized and polarized rates become rather compact.