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The quest for gluon saturation effects @ RHIC ...
y = 0, Q2 = 1-100 GeV2/c2
- pQCD collinear factorization
- DGLAP evolution (g splitting)
- small nuclear effects in PDFs
(LT shadowing).
Moderate pT, rapidities:
y ≈ 1-3, Q2 ≈ 10 GeV2/c2
- kT factorization
- linear BFKL evolution (g splitt.)
- “moderate” nuclear effects (LT
shadowing).
Low pT @ large rapidities:
y > 3, Q2 < Qs2 ≈ 5 GeV2/c2
- pQCD factorization breakdown
- non-linear evolution (g fusion)
- strong nuclear effects in the
initial-state