Chi1 and Polarisation Asymmetries for Quarkonia at High Orders in Non-relativistic QCD
Sourendu Gupta, Prakash Mathews
Abstract
We study doubly polarised asymmetries of c-cbar and b-bbar 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 v9. The asymmetries in the production of etac,b states are a stable measure of the polarised gluon densities. The asymmetries for chic,b, J/psi, psi', and the various Upsilon states are stringent tests of the NRQCD scaling relations.
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