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Electroproduction of heavy quarkonia: Significance of dipole orientation
Journal
Physical Review D
Date Issued
2021-05-21
Author(s)
Abstract
The differential cross section dσ/dq2 of diffractive electroproduction of heavy quarkonia on protons is a sensitive study tool for the interaction dynamics within the dipole representation. Knowledge of the transverse momentum transfer q⃗ provides a unique opportunity to identify the reaction plane, due to a strong correlation between the directions of q⃗ and impact parameter b⃗ . On top of that, the elastic dipole-proton amplitude is subject to a strong correlation between b⃗ and dipole orientation r⃗ . Most of models for b-dependent dipole cross section either completely miss this information, or make unjustified assumptions. We perform calculations basing on a realistic model for r⃗ -b⃗ correlation, which significantly affect the q-dependence of the cross section, in particular the ratio of ψ′(2S) to J/ψ yields. We rely on realistic potential models for the heavy quarkonium wave function, and the Lorentz-boosted Schrödinger equation. Good agreement with data on q-dependent diffractive electroproduction of heavy quarkonia is achieved.
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