Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2003-08-10
Phys.Lett.B586:244-253,2004
Physics
Nuclear Physics
Nuclear Theory
9 pages, 5 figures. A bug in the kt-smearing routine was found and corrected. K-factor an p0 have then been refitted in p+p co
Scientific paper
10.1016/j.physletb.2004.02.020
Multiple initial state parton interactions in p(d)+Au collisions are calculated in a Glauber-Eikonal formalism. The convolution of perturbative QCD parton-nucleon cross sections predicts naturally the competing pattern of low-pT suppression due geometrical shadowing, and a moderate-pT Cronin enhancement of hadron spectra. The formal equivalence to recent classical Yang-Mills calculations is demonstrated, but our approach is shown to be more general in the large x>0.01 domain because it automatically incorporates the finite kinematic constraints of both quark and gluon processes in the fragmentation regions, and accounts for the observed spectra in elementary pp-->\pi+X processes in the RHIC energy range, sqrt{s} = 20-200 GeV. The Glauber-Eikonal formalism can be used as a baseline to extract the magnitude of dynamical shadowing effects from the experimental data at differente centralities and pseudo-rapidities.
Accardi Alberto
Gyulassy Miklos
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