Exclusive $J/ψ$ photoproduction and gluon polarization

Details Exclusive $J/ψ$ photoproduction and gluon polarization Exclusive $J/ψ$ photoproduction and gluon polarization

1998-07-08

arxiv.org/abs/hep-ph/9807287v3

Phys.Lett. B440 (1998) 157-162

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, Latex, psfig, 2 figures; v2: references and acknowledgement updated; v3: sign of asymmetry reversed, conclusions unc

Scientific paper

10.1016/S0370-2693(98)01076-4

In exclusive $J/\psi$ production by polarized photons incident on polarized
protons, a finite polarization asymmetry arises because of $c\bar c$
Fermi-motion and binding-energy effects. The asymmetry depends on the polarized
nonforward gluon distribution of the proton and thus gives information on gluon
polarization in the proton. The analyzing power, however, is rather small.

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