Abstract
We discuss the structure of the polarization density matrix of gauge bosons produced at high q T in high energy proton-antiproton collisions. First O( α s 2) results on the parity-conserving components of the polarization density matrix are reported. We calculate next-to-leading order corrections to the O( α s ) relation A 0 = A 2 between the longitudinal and transverse interference density matrix elements.
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