AGeV insures that $p_T\sim 10-20$ GeV jet production rates are large enough to measure via a wide array of inclusive and correlation observables. These hard partons serve as effective “external” tomographic probes of the the QGP and test its -dynamics. Jets play the analogous role of neutrinos that probe the physics of stellar cores, while hadrons play the role of photons that probe the corona of the fireball.

Below RHIC energies, the [***pQCD***]{} line of evidence could not be fully developed because the jet rates decrease too rapidly with energy. However, even more importantly, at the lower $p_T < 4$ GeV available the effects of initial state nuclear dynamics and the final state hadronic dynamics could not be completely deconvoluted from the final spectra. This is the key point that I will repeatedly emphasize which differentiates the observables at the SPS and RHIC energies. The necessity to test for the same complications at RHIC is what gives rise to the third term in Eq.(\[qgpdef\]).

The third term, denoted by $\underline{\rm \bf dA}$, stands for control experiments that can clearly differentiate between alternative nuclear dependences specific to [*initial state*]{} partonic wavefunctions as well as the production mechanisms. The control differential, ${\rm 