Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-07-12
Phys.Rev. D62 (2000) 094022
Physics
High Energy Physics
High Energy Physics - Phenomenology
33 pages of Latex including 12 figures. Fig. 2 and a few references are added
Scientific paper
10.1103/PhysRevD.62.094022
Elastic virtual photoproduction cross sections gamma^*p -> J/psi(psi')p and total charmonium-nucleon cross sections for J/psi, psi' and chi states are calculated in a parameter free way with the light-cone dipole formalism and the same input: factorization in impact parameters, light-cone wave functions for the gamma^* and the charmonia, and the universal phenomenological dipole cross section which is fitted to other data. The charmonium wave functions are calculated with four known realistic potentials, and two models for the dipole cross section are tested. Very good agreement with data for the cross section of charmonium photoproduction is found in a wide range of s and Q^2. The inclusion of the Melosh spin rotation increases the psi' photoproduction rate by a factor 2-3 and removes previously observed discrepancies in the psi' to J/psi ratio in photoproduction. We also calculate the charmonium-proton cross sections whose absolute values and energy dependences are found to correlate strongly with the sizes of the states.
Huefner Joerg
Ivanov Yu. P.
Kopeliovich Boris Z.
Tarasov Victor A.
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