Mm. Tung et al., O(ALPHA(S)) SPIN-SPIN CORRELATIONS FOR TOP AND BOTTOM QUARK PRODUCTION IN E(-) ANNIHILATION()E(), Physics letters. Section B, 418(1-2), 1998, pp. 181-191
We present the full O(alpha(s)) longitudinal spin-spin correlations fo
r heavy-quark pair production at e(+)e(-) high-energy colliders in clo
sed analytical form. In such reactions, quark and antiquark have stron
gly correlated spins, and the longitudinal components are dominant. Fo
r the explicit computation of the QCD bremsstrahlung contributions, ne
w phase-space integrals are derived. Explicit numerical estimates are
given for tr and bb production. Around the Z-peak, QCD one-loop correc
tions depolarize the spin-spin asymmetry for bottom quark pairs by app
roximately -4%. For top pair production, we find at 350 GeV a 0.6% inc
reased polarization over a value of 0.4 in the longitudinal correlatio
n. For more than 1 TeV the O(alpha(s)) corrections enhance depolarizat
ion to -2% in the top-pair case. (C) 1998 Elsevier Science B.V.