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Initial-state CGC effects
Nucleus-nucleus collisions described as a
collision of two “classical” gluonic wave-functions
(“Color Glass Condensate”).
Approximation valid around “saturation scale”:
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- Q2s >> L2QCD as<<1 (weak coupling)
"Classical" (Chromo-Dynamics) methods applicable
Particle production via glue-glue collisions:
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Extension to pT > Qs (“geometric scaling”)
via quantum evolution.
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Expected result: gluon fusion at low x leads to an effective depletion of the number of partonic scattering centers in the initial state.