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The azimuthal correlation between the planes formed by the vectors  $(\vec{p}_\ell,\vec{p}_{X_b})$ and $(\vec{p}_\ell,\vec{P}_t)$ in thesemileptonic rest frame decay of a polarized top quark $t(\uparrow) \to X_b +l^+ + \nu_\ell$ belongs to a class of polarization observables involving thetop quark which vanish at the Born term level in the standard model. Wedetermine the next--to--leading order QCD corrections to the afore-mentionedazimuthal correlation and compare the result to the corresponding contributionof a non--standard--model right--chiral quark current.Comment: latex, 12 pages with 2 figures in the text, typos removed,comment and  references added, replaced with published versio

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

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Azimuthal correlation between the(p→l,p→Xb)and