Longitudinal, transverse-plus and transverse-minus W-bosons in unpolarized top quark decays at O(alphas)
M. Fischer, S. Groote, J. G. Körner, M. C. Mauser
Abstract
We consider the O(alphas) radiative corrections to the decay of an unpolarized top quark into a bottom quark and a W-gauge boson where the helicities of the W are specified as longitudinal, transverse-plus and transverse-minus. The O(alphas) radiative corrections lower the normalized longitudinal rate GammaL/Gamma by 1.06% and increase the the normalized transverse-minus rate Gamma-/Gamma by 2.17%. We find that the normalized transverse-plus rate Gamma+/Gamma, which vanishes at the Born term level for mb->0, receives radiative correction contributions at the sub-percent level. We discuss mb!=0 effects for the Born term and the alphas-contributions but find these to be small. Our results are discussed in the light of recent measurements of the helicity content of the W in top quark decays by the CDF Collaboration.
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