We review the predictions of the theory of a color glass condensate for a gluon production cross section in $p\left(d\right)A$ collisions. We demonstrate that, at moderate energies, when the gluon production cross section can be calculated in the framework of the McLerran-Venugopalan model, it has only a partonic level Cronin effect in it. At higher energies or rapidities corresponding to smaller values of the Bjorken x, quantum evolution becomes important. The effect of quantum evolution at higher energies or rapidities is to introduce the suppression of high-$p_T$ gluons slightly decreasing the Cronin enhancement. At still higher energies or rapidities quantum evolution leads to the suppression of produced gluons at all values of $p_T.$

• Received 3 July 2003

DOI:https://doi.org/10.1103/PhysRevD.68.094013