QCD-corrected spin analysing power of jets in decays of polarized top quarks

We present results for the differential distributions of jets from non-leptonic decays of polarized top quarks within the Standard Model, including QCD radiative corrections. Our work extends existing results which are only available for semileptonic top quark decays at the parton level. For t(↑)→ b...

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Bibliographic Details
Published inPhysics letters. B Vol. 539; no. 3; pp. 235 - 241
Main Authors Brandenburg, A., Si, Z.G., Uwer, P.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 18.07.2002
Subjects
Jets
Polarization
QCD corrections
Top quarks
Polarization
14.65.Ha
13.88.+e
Jets
12.38.Bx
Top quarks
QCD corrections
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Summary:We present results for the differential distributions of jets from non-leptonic decays of polarized top quarks within the Standard Model, including QCD radiative corrections. Our work extends existing results which are only available for semileptonic top quark decays at the parton level. For t(↑)→ b-jet+2 light jets we compute in particular the QCD-corrected top-spin analysing power of the  b-quark jet and the least energetic light jet. The dependence of the results on the choice of the jet recombination scheme is found to be small. In addition we compute the spin analysing power of the thrust axis. Our results constitute a so far missing ingredient to analyse top quark production and subsequent non-leptonic decay at next-to-leading order in α s , keeping the full information on the top quark polarization.
ISSN:0370-2693
1873-2445
DOI:10.1016/S0370-2693(02)02098-1