Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-05-26
Phys.Rev. D70 (2004) 114017; Erratum-ibid. D71 (2005) 079901
Physics
High Energy Physics
High Energy Physics - Phenomenology
31 pages, 14 figures, v2: minor corrections and discussion on AGK violation added; v3: minor calculational errors corrected
Scientific paper
10.1103/PhysRevD.70.114017
We calculate production cross sections of a forward quark-gluon pair and of two gluons at mid-rapidity in Deep Inelastic Scattering and in high energy proton-nucleus collisions. The calculation is performed in the framework of the Color Glass Condensate formalism. We first calculate the cross sections in the quasi-classical approximation, which includes multiple rescatterings in the target. We then proceed to include the effects of non-linear small-x evolution in the production cross sections. It is interesting to note that our result for the two-gluon production cross section appears to be in direct violation of AGK cutting rules, which is the first example of such violation in QCD. The calculated quark-gluon and gluon-gluon production cross sections can be used to construct theoretical predictions for two-particle azimuthal correlations at RHIC and LHC (I^{p(d)A}) as well as for Deep Inelastic Scattering experiments at HERA and eRHIC.
Jalilian--Marian Jamal
Kovchegov Yuri V.
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