Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-12-12
Eur.Phys.J.C28:71-77,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, 4 figures. Version to be published in Eur. Phys. J. C
Scientific paper
10.1140/epjc/s2003-01149-9
The contribution of the QCD Pomeron to the process AA -> AA J/Psi J/Psi is discussed. We focus on the photon-photon collision, with the quasi-real photon coming from the Weizsacker - Williams spectrum of the nuclei. We calculate the cross section for this process considering the solution of the LLA BFKL equation at zero momentum transfer using a small-t approximation for the differential cross section of the subprocess. Furthermore, the impact of non-leading corrections to the BFKL equation is also analyzed. In both cases the cross section is found to increase with the energy, predicting considerable values for the LHC energies. Moreover, we compare our results with the Born two-gluon approximation, which is energy independent at the photon level. Our results indicate that the experimental analyzes of this process can be useful to discriminate the QCD dynamics at high energies.
Goncalves Victor P.
Machado Magno V. T.
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