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Spin density matrix of top quark pairs produced in electron-positron annihilation including QCD radiative corrections

1998; American Physical Society; Volume: 59; Issue: 1 Linguagem: Inglês

10.1103/physrevd.59.014001

1538-4500

A. Brandenburg, M. Flesch, Peter Uwer,

High-Energy Particle Collisions Research

We calculate the spin density matrix of top quark pairs for the reaction $e^+e^-\to t\bar{t}X$ to order $\alpha_s$. As an application we show next-to-leading order results for a variety of spin observables for the $t\bar{t}$ system. These include the top quark and antiquark polarizations and $t\bar{t}$ spin-spin correlations as a function of the center-of-mass energy and of the top quark scattering angle for arbitrary longitudinal polarization of the electron/positron beam.