Two-Spin Asymmetry for ψ Photoproduction with Color-Octet Mechanism
Kazutaka Sudoh, Toshiyuki Morii
Abstract
We studied the photoproduction of ψ in the forward regions in polarized γp collisions at relevant HERA energies. We found that this reaction is very effective to test the color-octet mechanism which is based on the NRQCD factorization formalism. Furthermore we found that the value of the NRQCD matrix elements can be severely constrained by measuring the two-spin asymmetry, though the process depends on the polarized gluon distribution Δg(x).
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