Gluon saturation and initial conditions for relativistic heavy ion collisions

Abstract

We present an overview of theoretical aspects of the phenomenon of gluon saturation in high energy scattering in Quantum Chromo Dynamics. Then we review the state-of-the-art of saturation-based phenomenological approaches to the study and characterisation of the initial state of ultra-relativistic heavy ion collisions performed at RHIC and the LHC. Our review focuses mostly in the Color Glass Condensate effective theory, although we shall also discuss other approaches in parallel.

72 pages and 31 figures

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• Triumvirate of Running Couplings in Small-x Evolution
• The ridge in proton-proton collisions at the LHC
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• Particle multiplicities in Lead-Lead collisions at the LHC from non-linear evolution with running coupling
• CGC predictions for p+A collisions at the LHC and signature of QCD saturation
• Running coupling and power corrections in nonlinear evolution at the high--energy limit
• Nuclear modification of high transverse momentum particle production in p+A collisions at RHIC and LHC
• One gluon, two gluon: multigluon production via high energy evolution
• Two-gluon correlations and initial conditions for small-x evolution
• Pomeron loop and running coupling effects in high energy QCD evolution
• Running Coupling Corrections to High Energy Inclusive Gluon Production
• Energy losses in the black disc regime and correlation effects in the STAR forward pion production in dAu collisions
• Azimuthal Angle Correlations for Rapidity Separated Hadron Pairs in d+Au Collisions at sqrt(s_NN) = 200 GeV

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