Fermi Motion and Quark Off-Shellness in Elastic Vector-Meson Production
Abstract
We study ways of implementing Fermi momentum in elastic vector-meson production, and find that the usual on-shell assumption of quark models and quark wave functions cannot reproduce the ratio of the longitudinal cross section to the transverse one. We propose a new approach which allows the quarks to be off-shell, and which naturally reproduces the data. As a consequence, we prove that the asymptotic form of the transverse cross section is different from 1/Q^8. In this new model, we show that the mass, t and Q2 dependence of the cross sections are also reproduced. We also make predictions concerning the production of excited states such as the rho' and the psi'.
Cite
@article{arxiv.hep-ph/9807294,
title = {Fermi Motion and Quark Off-Shellness in Elastic Vector-Meson Production},
author = {I. Royen and J. R. Cudell},
journal= {arXiv preprint arXiv:hep-ph/9807294},
year = {2009}
}
Comments
23 pages, LaTeX, 14 figures. Some equations have been corrected, and the figures are updated to include the latest published data from ZEUS. Following the injunction of the chairman of the H1 collaboration, we have removed all H1 public preliminary data from our comparative plots