Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-12-20
AIP Conf.Proc. 660 (2003) 283-295
Physics
High Energy Physics
High Energy Physics - Phenomenology
Talk at 2-nd International Workshop on Hadron Physics, 25-29 September 2002, Coimbra, Portugal. To appear in the Workshop Proc
Scientific paper
10.1063/1.1570580
Elastic virtual photoproduction of charmonia on nucleons is 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 photons 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 electroproduction is found in a wide range of $s$ and $Q^2$. Using the ingredients from those calculations we calculate also exclusive electroproduction of charmonia off nuclei. Here new effects become important, (i) color filtering of the $c\bar c$ pair on its trajectory through nuclear matter, (ii) dependence on the finite lifetime of the $c\bar c$ 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 $s$ are presented. The results can be tested with future electron-nucleus colliders or in the peripheral collisions of relativistic heavy ions.
Huefner Joerg
Ivanov Yu. P.
Kopeliovich Boris Z.
Tarasov Victor A.
No associations
LandOfFree
Electroproduction of Charmonia off Protons and Nuclei does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Electroproduction of Charmonia off Protons and Nuclei, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electroproduction of Charmonia off Protons and Nuclei will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-674744