Top quark polarization as a probe of tt threshold dynamics
V. S. Fadin, V. A. Khoze, M. I. Kotsky
Abstract
We study the spin properties of top quarks produced in collisions of polarized photons in the threshold region. For a relatively heavy top quark the influence of non-perturbative effects is small and its polarization parameters can be predicted in perturbative QCD. The measurements of the top polarization may allow a novel test of QCD in the tt system. In particular, they may provide a new way to determine the precise value of αs and to study the properties of the top quark.
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