Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-07-22
Nucl.Phys.B509:357-377,1998
Physics
High Energy Physics
High Energy Physics - Phenomenology
31 pages, 5 Postscript figures; some errors in numerical calculations for EMC effect corrected
Scientific paper
10.1016/S0550-3213(97)00682-2
The absorptive corrections resulting from the rescattering of a heavy flavour (the so-called nuclear absorption) are usually calculated with a probabilistic formula valid only in the low energy limit. We extend this formula to all energies using a quantum field theoretical approach. For charmonium and bottonium we find that the absorptive corrections in the rigorous treatment are very similar to the ones in the probabilistic approach. On the contrary, at sufficiently high energy, open charm and bottom are absorbed as much as charmonium and bottonium - in spite of the fact that their absorptive cross-sections are zero, and therefore they are not absorbed in the probabilistic model. At high enough energies there are also absorptive corrections due to the shadowing of the nucleus structure function, which are present for all systems including Drell-Yan pair production. These shadowing corrections cancel in the low energy limit.
Armesto Nestor
Braun Mikhail A.
Capella Antonio
Pajares Carlos
Salgado Carlos A.
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