Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-09-06
Int.J.Mod.Phys.A12:3857-3866,1997
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 2 figures included. To appear in the Proceedings of the University of Illinois, Chicago, Quarkonium Workshop, June 1
Scientific paper
10.1142/S0217751X97002012
In this talk I review the recent progress made in the calculations of quarkonia production in fixed target experiments. NRQCD organizes the calculations in a systematic expansion in $\alpha_s$ and $v$, the relative velocity between the heavy quarks. Within this formalism there are octet contributions which are not included in the color singlet model. These contributions depend upon unknown matrix elementsof local operators which are fit to the data. Using these fits, there are several predictions which do indeed improve agreement with the data. However, the prediction for the polarization of the produced states as well as the ratio of the $\chi_1$ to $\chi_2$ cross sections differ substantially from the data for the case of pion beams. Possible large corrections from higher twist effects are discussed as is the issue of the the proper choice of masses.
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