Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-11-07
Prog.Theor.Phys.Suppl.187:123-133,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, based on talks given by the author in in the program "High Energy Strong Interactions 2010" at the Yukawa Institute
Scientific paper
10.1143/PTPS.187.123
Two-hadron correlations are a sensitive probe of the dynamics of gluon saturation and the Color Glass Condensate formalism where the degrees of freedom are Wilson lines of the gluon field. It is shown that unlike structure functions in DIS and single hadron production in proton-nucleus collisions, higher point functions of Wilson lines appear in two-hadron production cross section. We derive equations for the energy ($x$) evolution of these higher point functions using the JIMWLK Hamiltonian and show that dipole approximation, employed in the literature to fit the di-hadron data measured by the STAR collaboration in the forward rapidity region, breaks down. This necessitates an investigation of the full hierarchy of the JIMWLK evolution equations for these higher point functions and their solutions. This can then be used to make a quantitative analysis of the di-hadron correlations in the forward rapidity region in deuteron-gold collisions at RHIC and in the long range rapidity correlations observed in proton-proton collisions at the LHC.
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