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HK: Physik der Hadronen und Kerne

HK 44: Theory VIII

HK 44.2: Gruppenbericht

Donnerstag, 14. März 2002, 16:30–17:00, C

Energy dependence of QCD cross sections: Saturation effects from HERA to RHIC and LHC — •Heribert Weigert¹, Kari Rummukainen², Andreas Schäfer¹, and Rainer Fries¹ — ¹Universität Regensburg — ²Nordita, Kopenhagen

Gluon evolution enhances the importance of multiple interaction effects in eA and AA collisions at high energies. These mimic properties such as screening and saturation in ways otherwise only known from dense media. They are responsible for the unitarization of cross sections, the infrared safety of properly resummed perturbation theory and allow us to calculate the energy dependence of various cross sections semiperturbatively. I will try to highlight the key ingredients to the underlying physical picture and the ensuing technology (a renormalization group w.r.t. x_Bj) and its conceptual relevance to HERA, eRHIC, RHIC and LHC experiments.