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Cronin effect vs. geometrical shadowing in d+Au collisions at RHIC

Alberto Accardi·Miklos Gyulassy
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Abstract

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-->π+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.

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Alberto Accardi, Miklos Gyulassy. 2004-01-22. Cronin effect vs. geometrical shadowing in d+Au collisions at RHIC. https://doi.org/10.1016/j.physletb.2004.02.020

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