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High-pT @ RHIC: theory confronting data
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APPROACH “A” (pQCD, factorization theorem):
- Step 1: pQCD (NLO or LO+K-factor) = PDFs + scatt. matrix + FFs
- Step 2: pQCD + nPDF (shadowing) + pT broadening (Cronin)
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- Peripheral data explained
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- Step 3: pQCD + initial-state nuclear effects + Parton energy loss
- Energy loss 1: BDMPS (LPM, thick plasma)
- Energy loss 2: GLV (LPM, thin plasma)
- Energy loss 3: HSW (modified FFs), (g radiation + absorption)
- Goal: explain central colls. (magnitude of quench, pT dependence)
Step 4: pQCD + IS nuc. effects + Energy loss + parton recombination
Goal: explain baryon-meson diff. in central colls.
APPROACH “B” (“classical” CD):
- Step 1: CGC (gluon saturated nuclear wave function: MLV, “evolved”)
- Step 2: glue + glue collisions: gg g
- Step 3: Gluon fragmentation (FFs)
- Goal: explain deficit, Npart scaling ...
Notes: