with $p_T$, the elliptic asymmetry stops growing and the difference between baryon vs meson $v_2$ reverses sign! Between $2<p_T<5$ GeV the baryon $v_2^B(p_T)$ exceeds the meson $v_2^M(p_T)$ by approximately 3/2. For such short wavelength components of the QGP, local equilibrium simply cannot be maintained due the fundamental asymptotic freedom property of QCD. I return to the baryon dominated transition region $1<p_T<5$ GeV in a later section since this involves interesting but as yet uncertain non-equilibrium non-perturbative processes. In this section I concentrate on the $p_T>2$ GeV meson observables that can be readily understood in terms QGP modified [**pQCD**]{} dynamics [@Gyulassy:2003mc; @Baier:2000mf].

The quantitative study of short wavelength partonic [**pQCD**]{} dynamics focuses on the rare high $p_T$ power law tails that extend far beyond the typical (long wavelength) scales $p<  3 T \sim 1$ GeV of the bulk QGP. The second major discovery at RHIC is that the non-equilibrium power law high $p_T$ jet distributions remain power law like but are strongly quenched [@Adcox:2001jp]-[@Adler:2002ct]. Furthermore, the quenching pattern has a distinct centrality, $p_T$, azimuthal angle, and hadron flavor dependence that can be used to test the underlying dynamics in many independent ways.

![Jet Quenching at RHIC. Left shows the jet quenching 