Approaches to QGP Detection (III): - Small cross-section (penetrating) probes -

Info: ? Direct (partonic) signatures of initial-state & QGP-phase.

Pro: ? pp and ppbar baseline data available (with A scaling). ? Elementary processes and backgrounds calculable via pQCD. Inclusive particle production cross-section in p+p collision:

Caveats: ? Parton/fragm. distrib. Fp(x,Q2), Dp/x(z,Q’2) not known at all x,z ? Nuclear modifications (shadowing, anti-shadow, EMC effect)

? Multiple initial-state (soft & semi-hard) parton scattering (Cronin enhancement): KT “broadening” (additional to intrinsic KT)

e.g. prompt g , Drell-Yan

dileptons, open charm,

quarkonium states,

hard jets

Factorization theorem:

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