Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2005-01-24
Eur.Phys.J.C43:233-237,2005
Physics
Nuclear Physics
Nuclear Theory
12 pages + 5 figures. Invited talk at Hard Probes 2004
Scientific paper
10.1140/epjc/s2005-02271-4
Hadron production at all $p_T$ in heavy-ion collisions in the framework of parton recombination is reviewed. It is shown that the recombination of thermal and shower partons dominates the hadron spectra in the intermediate $p_T$ region. In $d+Au$ collisions, the physics of particle production at any $\eta$ is basically the same as at $\eta=0$. The Cronin effect is described as a result of the final-state instead of the initial-state interaction. The suppression of $R_{CP}$ at high $\eta$ is due to the reduction of the soft parton density on the deuteron side, thus resulting in less pions produced by recombination, an explanation that requires no new physics. In $Au+Au$ collisions large $p/\pi$ ratio is obtained because the thermal partons can contribute to the formation of proton more than they do to the pion.
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