Top quark polarization as a probe of $t\bar{t}$ 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 $t\bar{t}$ system. In particular, they may provide a new way to determine the precise value of ${\alpha }_s$ and to study the properties of the top quark.

21 pages. Figures available upon request

References in corpus (1)

• Threshold Effects on Heavy Quark Production in $\gamma \gamma$ Interactions

Cited by in corpus (11)

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• An Interaction Region for Gamma-Gamma and Gamma-Electron Collisions at TESLA/SBLC
• COULOMB EFFECTS IN W+ W- PRODUCTION
• Analytical results for $e^{+}{e}^{-}\to t\bar{t}$ and $\gamma \gamma \to t\bar{t}$ observables near the threshold up to the next-to-next-to-leading order of NRQCD
• Spinning the Top
• Higher-order Coulomb Corrections to the Threshold e+ e- --> W+ W- Cross Section
• Optimal Spin Basis in Polarized Photon Linear Colliders
• Probe of CP Violation in e+e- -> ttbar Near Threshold
• On the Coulomb Effects on the W Line Shape at LEP2
• Top quark pair production and decay at a polarized photon collider
• Finite width and irreducible background effects to $t\bar{t}$ production at $\gamma \gamma$ Next Linear Colliders