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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