O(αₛ) Corrections to Longitudinal Spin-Spin Correlations in e+e- -> q qbar
Groote, S. · Körner, J. G. · Leyva, J. A.
Original · EN
We calculate the O(αₛ) corrections to longitudinal spin-spin correlations in e+e-→ q q. For top quark pair production the O(αₛ) corrections to the longitudinal spin-spin asymmetry amount to less than 1% in the q²-range from above t t-treshold up to √q²= 1000 GeV. In the e+e-→ b b case the O(αₛ) corrections reduce the asymmetry value from its m=0 value of -1 to approximately -0.96 for q²-values around the Z-peak. This reduction can be traced to finite anomalous contributions from residual mass effects which survive the m→ 0 limit. We discuss the role of the anomalous contributions and the pattern of how they contribute to spin-flip and no-flip terms.
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