O(α_s) corrections to the decays of polarized W^+- and Z bosons into massive quark pairs

Details O(α_s) corrections to the decays of polarized W^+- and Z bosons into massive quark pairs O(α_s) corrections to the decays of polarized W^+- and Z bosons into massive quark pairs

2012-04-24

arxiv.org/abs/1204.5295v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages, 2 figures

Scientific paper

We present O(\alpha_s) results on the decays of polarized W^+- and Z bosons into massive quark pairs. The NLO QCD corrections to the polarized decay functions are given up to the second order in the quark mass expansion. We find a surprisingly strong dependence of the NLO polarized decay functions on finite quark mass effects even at the relatively large mass scale of the W^+- and Z bosons. As a main application we consider the decay t -> b + W^+ involving the helicity fractions \rho_{mm} of the W^+ boson followed by the polarized decay W^+(\uparrow) -> q_1 qbar_2 for which we determine the O(\alpha_s) polar angle decay distribution. We also discuss NLO polarization effects in the production/decay process e^+e^- -> Z(\uparrow) -> q qbar.

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