Hard Scattering Processes
? At the initial stage of Relativistic Heavy Ion
Collisions, the hard scattering of quarks and
gluons is predicted to be dominant process.
? By measuring high pt photons (or lepton
pairs) and high pt jet via leading particle,
products of the hard scattering can be
? Parton Distribution Function(PDF) for pp and
pA can be studied to determine modifications
to the known pQCD, nuclear shadowing/EMC
? At the same time, understanding of PDF of
colliding nuclei can provide good insight into
the initial hot/dense environment.