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QCD corrections to decay-lepton polar and azimuthal angular distributions in e+e- - t tbar

QCD corrections to order alpha_s in the soft-gluon approximation to angular distributions of decay charged leptons in the process e+e- -> t tbar followed by semileptonic decay of t or tbar, are obtained in the e+e- centre-of-mass frame. As compared to dist

2

002 ebF 62 1v1422020/hp-pe:hviXraQCDcorrectionstodecay-leptonpolarandazimuthalangulardistributionsine+e →t

t,

followedbysemileptonicdecayoftor

t.Analyticexpressionforthetripledistribution

inthepolarangleoftandpolarandazimuthalanglesoftheleptonisobtained.Analyticexpressionisalsoderivedforthedistributionin√

thecharged-leptonpolarangle.Numericalvaluesarediscussedfor

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