Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2003-07-05
Phys.Lett.B577:54-60,2003
Physics
Nuclear Physics
Nuclear Theory
6pages, 4figures, revised version
Scientific paper
10.1016/j.physletb.2003.09.097
We show that the numerical solution of the classical SU(3) Yang-Mills equations of motion in the McLerran-Venugopalan model for gluon production in central heavy ion collisions leads to a suppresion at low $p_t$ and an enhancement at the intermediate $p_t$ region as compared to peripheral heavy ion and pp collisions at the same energy. Our results are compared to previous, Color Glass Condensate inspired calculations of gluon production in heavy ion collisions. We revisit the predictions of the Color Glass Condensate model for $pA$ ($dA$) collisions in Leading Order and show that quantum evolution--in particular the phenomenon of geometric scaling and change of anomalous dimensions--preserves the Cronin enhancement of $pA$ cross section (when normalized to the leading twist term) in the Leading Order approximation even though the $p_t$ spectrum can change. We comment on the case when gluon radiation is included.
Jalilian--Marian Jamal
Nara Yasushi
Venugopalan Raju
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