https://doi.org/10.1140/epjc/s2005-02271-4
Theoretical Physics
Parton recombination at all p T
University of Oregon, Institute of Theoretical Science and Department of Physics, OR 97403-5203, Eugene, USA
* e-mail: hwa@oregon.uoregon.edu
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 
is basically the same as at 
. 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 is due to the reduction of the soft parton density on the deuteron side, thus resulting in less pions being produced by recombination, an explanation that requires no new physics. In Au + Au collisions a large 
ratio is obtained because the thermal partons can contribute to the formation of a proton more than they do to the pion.
© Springer-Verlag, 2005
