O(alpha_s) Spin-Spin Correlations for Top and Bottom Quark Production in e+ e- Annihilation
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O(alpha_s) Spin-Spin Correlations for Top and Bottom Quark Production in e+ e- Annihilation

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O(alpha_s) Spin-Spin Correlations for Top and Bottom Quark Production in e+ e- Annihilation

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Tung, M.; Bernabeu Alberola, José Perfil; Peñarrocha Gantes, José Antonio
Aquest document és un/a article, creat/da en: 1998
We present the full O(alpha_s) longitudinal spin-spin correlations for heavy-quark pair production at e+ e- high-energy colliders in closed analytical form. In such reactions, quark and antiquark have strongly correlated spins, and the longitudinal components are dominant. For the explicit computation of the QCD bremsstrahlung contributions, new phase-space integrals are derived. Explicit numerical estimates are given for t t_bar and b b_bar production. Around the Z-peak, QCD one-loop corrections depolarize the spin-spin asymmetry for bottom quark pairs by approximately -4%. For top pair production, we find at 350GeV a 0.6% increased polarization over a value of 0.4 in the longitudinal correlation. For more than 1 TeV the O(alpha_s) corrections enhance depolarization to -2% in the top-pair case.

    Tung, M.; Bernabeu Alberola, José; Peñarrocha Gantes, José Antonio (1998) O(alpha_s) Spin-Spin Correlations for Top and Bottom Quark Production in e+ e- Annihilation Physics Letters B 418 1-2 181 191
http://dx.doi.org/10.1016/S0370-2693(97)01438-X
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