Optimal spin-quantization axes for quarkonium with large transverse momentum

Details Optimal spin-quantization axes for quarkonium with large transverse momentum Optimal spin-quantization axes for quarkonium with large transverse momentum

2008-12-19

arxiv.org/abs/0812.3727v2

Phys.Rev.D79:054013,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 1 figure, minor corrections, version published in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.79.054013

The gluon collision process that creates a heavy-quark-antiquark pair with small relative momentum and large transverse momentum predicts at leading-order in the QCD coupling constant that the transverse polarization of the pair should increase with its transverse momentum. Measurements at the Fermilab Tevatron of the polarization of charmonium and bottomonium states with respect to a particular spin-quantization axis are inconsistent with this prediction. However the predicted rate of approach to complete transverse polarization depends on the choice of spin-quantization axis. We introduce axes that maximize and minimize the transverse polarization from the leading-order gluon collision process. They are determined by the direction of the jet that provides most of the balancing transverse momentum.

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