χ 1 and Polarisation Asymmetries for Quarkonia at High Orders in Non - relativistic QCD
نویسنده
چکیده
We study doubly polarised asymmetries of ¯ cc and ¯ bb mesons in hadro-and photo-production at low transverse momentum in non-relativistic QCD to high orders in the relative velocity of the pair, v. We give the complete set of expressions required for the asymmetries up to order v 9. The asymmetries in the production of η c,b states are a stable measure of the polarised gluon densities. The asymmetries for χ c,b , J/ψ, ψ ′ , and the various Υ states are stringent tests of the NRQCD scaling relations.
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تاریخ انتشار 1997