Jet production in pA and AA collisions in the perturbative QCD pomeron model

Abstract.

Inclusive cross-sections for gluon jet production are studied numerically in the perturbative QCD pomeron model for pA and central AA collisions at high energies. Two forms for the inclusive cross-sections, with and without emission from the triple pomeron vertex, are compared. The difference was found to reduce to a numerical factor $\sim 0.7\div 0.8$ for momenta below the saturation momentum Q _s. Above Q _s no difference was found at all. For pA collisions the gluon spectrum was found to be $\sim A^{0.7}$ at momenta k below Q _s and $\sim A^{0.9}$ above it. For central AA collisions it was found to be $\sim A$ at momenta k below Q _s and $\sim A^{1.1}$ above it. At large k the spectrum goes like $1/k^{2.7\div 3.3}$, flattening with energy. The multiplicities turned out to be proportional to A ^0.7 for pA collisions and A for central AA collisions with a good precision. In the latter case they are becoming more peaked at the center with the growth of energy. Their absolute values are high and grow rapidly with energy in accordance with the high value of the BFKL intercept.