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arXiv · hep-ph/0202216

Electroproduction of Charmonia off Nuclei

Yu. P. Ivanov·B. Z. Kopeliovich·A. V. Tarasov·J. Huefner
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Abstract

In a recent publication we have calculated elastic charmonium production in ep collisions employing realistic charmonia wave functions and dipole cross sections and have found good agreement with the data in a wide range of s and Q^2. Using the ingredients from those calculations we calculate exclusive electroproduction of charmonia off nuclei. Here new effects become important, (i) color filtering of the c-cbar pair on its trajectory through nuclear matter, (ii) dependence on the finite lifetime of the c-cbar fluctuation (coherence length) and (iii) gluon shadowing in a nucleus compared to the one in a nucleon. Total coherent and incoherent cross sections for C, Cu and Pb as functions of s and Q^2 are presented together with some differential cross sections. The results can be tested with future electron-nucleus colliders or in peripheral collisions of ultrarelativistic heavy ions.

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Yu. P. Ivanov, B. Z. Kopeliovich, A. V. Tarasov, J. Huefner. 2002-02-26. Electroproduction of Charmonia off Nuclei. https://doi.org/10.1103/physrevc.66.024903

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