Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-01-03
Phys.Rev.Lett. 88 (2002) 232303
Physics
High Energy Physics
High Energy Physics - Phenomenology
the final version to appear in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.88.232303
Recent data from RHIC for high-$p_T$ hadrons in gold-gold collisions raised again the long standing problem of quantitatively understanding the Cronin effect, i.e. nuclear enhancement of high-$p_T$ hadrons due to multiple interactions in nuclear matter. In nucleus-nucleus collisions this effect has to be reliably calculated as baseline for a signal of new physics in high-$p_T$ hadron production. The only possibility to test models is to compare with available data for $pA$ collisions, however, all existing models for the Cronin effect rely on a fit to the data to be explained. We develop a phenomenological description based on the light-cone QCD-dipole approach which allows to explain available data without fitting to them and to provide predictions for $pA$ collisions at RHIC and LHC. We point out that the mechanism causing Cronin effect drastically changes between the energies of fixed target experiments and RHIC-LHC. High-$p_T$ hadrons are produced incoherently on different nucleons at low energies, whereas the production amplitudes interfere if the energy is sufficiently high.
Kopeliovich Boris Z.
Nemchik Jan
Schaefer Andreas
Tarasov Victor A.
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