Hard exclusive $J/ψ$ leptoproduction on polarized targets

Details Hard exclusive $J/ψ$ leptoproduction on polarized targets Hard exclusive $J/ψ$ leptoproduction on polarized targets

1998-05-15

arxiv.org/abs/hep-ph/9805338v2

Phys.Lett. B434 (1998) 141-146

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex, 12 pages, 1 ps figure; typos corrected, some points clarified in the text

Scientific paper

10.1016/S0370-2693(98)00755-2

We consider the exclusive production of $J/\psi$ mesons in polarized virtual-photon--proton collisions. We derive helicity amplitudes for the dominant subprocess $\gamma^* g \to J/\psi g$ and show that polarization asymmetries vanish in the case of collinear scattering. Thus, contrary to what has been suggested earlier, this process is not a good probe of the polarized gluon distribution $\Delta g(x,Q^2)$ of the proton.

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