Top quark polarization as a probe of tt threshold dynamics
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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