Upsilonium Polarization as a Touchstone in Understanding the Parton Dynamics in QCD

Details Upsilonium Polarization as a Touchstone in Understanding the Parton Dynamics in QCD Upsilonium Polarization as a Touchstone in Understanding the Parton Dynamics in QCD

2008-09-22

arxiv.org/abs/0809.3698v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 2 figures, to be published in Proceedings of HSQCD Workshop, Gatchina, 2008

Scientific paper

In the framework of the $k_T$-factorization approach, the production of Upsilon mesons at the Fermilab Tevatron is considered, and the comparisions of calculated $p_T$-distributions and spin alignment parameter $\alpha$ with the D0 experimental data are shown. We argue that measuring the double cross section and the polarization of upsilonium states can serve as a crucial test discriminating two competing theoretical approaches to parton dynamics in QCD.

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