Hard scattering in QCD media

• Initial-state effects: Final-state effects:

• If (vacuum) high pT hadroproduction is modified in the medium, is it due to initial- state ("Color Glass Condensate") and/or final-state (Quark Gluon Plasma) effects ?

• Hard scatt. in A+A (large soft backgd) studied via high pT (leading) hadron = jet tag.

Notes: