Two-Spin Asymmetry for $ψ^{\prime}$ Photoproduction with Color-Octet Mechanism

Details Two-Spin Asymmetry for $ψ^{\prime}$ Photoproduction with Color-Octet Mechanism Two-Spin Asymmetry for $ψ^{\prime}$ Photoproduction with Color-Octet Mechanism

1999-12-18

arxiv.org/abs/hep-ph/9912411v2

Phys.Rev.D62:057501,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages including 4 eps-figures, use epsfig.tex, Latex

Scientific paper

10.1103/PhysRevD.62.057501

We studied the photoproduction of $\psi^{\prime}$ in the forward regions in polarized $\gamma p$ 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 $\Delta g(x)$.

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