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High pT supp. & initial-state effects: gluon shadowing (1)
Relevant x region for high-pT (2.- 10. GeV/c) @ RHIC:
xT = 2pTparton/ s = 2 (pThadron/z) / s
[taking z~1, x~xT] x ~ 0.02-0.2
Proton: x < 0.1 P(arton)DFs G(luon)DFs:
Nuclei: Even more gluonic
xG(x,Q2) ~ A1/3/x (with ~ 0.2-0.3)
- For x<0.1 : PDFs depleted compared to proton
R(x,Q2,A) fiA(x,Q2) / [A fiN(x,Q2)] < 1 Shadowing (parton recombination, ...)
Notes: