Determining Color-Octet psi-Production Matrix Elements from gamma p and e p Processes

Details Determining Color-Octet psi-Production Matrix Elements from gamma p and e p Processes Determining Color-Octet psi-Production Matrix Elements from gamma p and e p Processes

1996-10-15

arxiv.org/abs/hep-ph/9610372v1

Int.J.Mod.Phys.A12:3995-4004,1997

Physics

High Energy Physics

High Energy Physics - Phenomenology

Presented at the 1996 University of Illinois at Chicago Quarkonium Physics Workshop. 10 pages, Latex, 5 figures included in te

Scientific paper

10.1142/S0217751X97002140

We calculated, within the NRQCD factorization formalism, the leading color-octet contributions to psi production in photon-nucleon and electron-nucleon collisions. The expressions obtained depend on the NRQCD matrix elements and . These matrix elements can be determined by fitting to experimental data. The color-octet contribution to psi photoproduction is in the forward region of phase space, where there may be large corrections to the NRQCD result from higher twist terms. As to psi leptoproduction we point out that the theoretical uncertainties plaguing the photoproduction calculation vanish in the large momentum transfer limit. In this region of phase space the NRQCD formalism should be valid, making psi leptoproduction an ideal laboratory for testing the theory.

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