Fermi Motion and Quark Off-Shellness in Elastic Vector-Meson Production

Details Fermi Motion and Quark Off-Shellness in Elastic Vector-Meson Production Fermi Motion and Quark Off-Shellness in Elastic Vector-Meson Production

1998-07-08

arxiv.org/abs/hep-ph/9807294v3

Nucl.Phys. B545 (1999) 505-525

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, LaTeX, 14 figures. Some equations have been corrected, and the figures are updated to include the latest published d

Scientific paper

10.1016/S0550-3213(98)00858-X

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'.

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