1998/05/31 by M. Vänttinen, L. Mankiewicz · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1016/s0370-2693(98)00755-2
published as Phys.Lett. B434 (1998) 141-146 · Latex, 12 pages, 1 ps figure; typos corrected, some points clarified in the text
arxiv created 1998/06/16 · openalex publication_date 1998/08/01 · arxiv updated 2009/11/30 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28
We consider the exclusive production of J/ψ mesons in polarized virtual-photon--proton collisions. We derive helicity amplitudes for the dominant subprocess γ^* g → J/ψg 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 Δg(x,Q2) of the proton.