The spin density matrix of top quark pairs produced in electron-positron annihilation including QCD radiative corrections
Abstract
We calculate the spin density matrix of top quark pairs for the reaction e+e- ttX to order αs. As an application we show next-to-leading order results for a variety of spin observables for the tt system. These include the top quark and antiquark polarizations and tt 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.
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