Wavefunction corrections and off-forward gluon distributions in diffractive J/psi electroproduction

Abstract

Diffractive production of J/Psi particles by virtual photons on a proton target is studied with a view towards understanding two important corrections to the leading order result. First, the effect of Fermi motion of the heavy quarks is studied by performing a systematic expansion in the relative velocity, and a simple correction factor is derived. This is considerably less than estimated previously. Second, since the kinematics necessarily requires that non-zero momentum be transferred to the proton, off-forward gluon distributions are probed by the scattering process. To estimate the importance of the off-forwardness, we compute, in leading order perturbation theory, the extent of deviation from the usual forward gluon distribution in a quark.

14 pages, 3 figures (Latex)

References in corpus (4)

• Gauge-Invariant Decomposition of Nucleon Spin and Its Spin-Off
• Asymmetric Gluon Distributions and Hard Diffractive Electroproduction
• Beyond The Colour-Singlet Model For Inelastic J/ψPhotoproduction
• Relativistic and Binding Energy Corrections to Direct Photon Production In Upsilon Decay

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