Decays of polarized top quarks to lepton, neutrino and jets at NLO QCD

Abstract

We compute the differential and total rate of the semileptonic decay of polarized top-quarks $t\to \ell {\nu }_{\ell }+b\mathrm{jet}+\mathrm{jet}$ at next-to-leading order (NLO) in the QCD coupling with an off-shell intermediate $W$ boson. We present several normalized distributions, in particular those that reflect the $t$-spin analyzing powers of the lepton, the b-jet and the $W^{+}$ boson at LO and NLO QCD.

Comments: Latex, 22 pages