Complete angular analysis of polarized top decay at O(alpha_s)

Details Complete angular analysis of polarized top decay at O(alpha_s) Complete angular analysis of polarized top decay at O(alpha_s)

2001-01-29

arxiv.org/abs/hep-ph/0101322v3

Phys.Rev.D65:054036,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

61 pages, 11 postscript figures added, typos corrected, revisions and extensions, figures added

Scientific paper

10.1103/PhysRevD.65.054036

We calculate the O(alpha_s) radiative corrections to the three spin independent and five spin dependent structure functions that describe the angular decay distribution in the decay of a polarized top quark into a W-boson (followed by the decay W^{+} -> l^{+} + nu_l or by W^{+} -> anti-q + q and a bottom quark. The angular decay distribution is described in cascade fashion, i.e. the decay t(uparrow) -> W^{+} + X_b is analyzed in the top rest system while the subsequent decay W^{+} -> l^{+} + nu_l (or W^{+} -> anti-q + q) is analyzed in the W rest frame. We present our results for the eight O(alpha_s) integrated structure functions in analytical form keeping the mass of the bottom quark finite. In the limit m_b -> 0 the structure function expressions reduce to rather compact forms.

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