/ Phenomenology-HEP hep-ph/0202216

Electroproduction of charmonia off nuclei

Ivanov, Yu.P. (Dubna, JINR) ; Kopeliovich, B.Z. (Regensburg U.) ; Tarasov, A.V. (Regensburg U.) ; Hufner, J. (Heidelberg, Max Planck Inst.)

Published in: Phys.Rev.
Year: 2002
Vol.: C66
Page No: 024903
Pages: 21

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.

Web-Page: http://www.adsabs.harvard.edu/abs/2002PhRvC..66b4903I; http://alice.cern.ch/format/showfull?sysnb=2296557; http://link.aps.org/abstract/PRC/V66/E024903/

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