Low‐Q² Partons in p‐p and Au‐Au Collisions

We describe correlations of low‐Q² parton fragments on transverse rapidity y_t and angles (η,φ) from p‐p and Au‐Au collisions at $s = 130$ and 200 AGeV. Evolution of correlations on y_t from p‐p to more‐central Au‐Au collisions shows evidence for parton dissipation. Cuts on y_t isolate angular correlations on (η,φ) for low‐Q² partons which reveal a large asymmetry about the jet thrust axis in p‐p collisions favoring the azimuth direction. Evolution of angular correlations with increasing Au‐Au centrality reveals a rotation of the asymmetry to favor pseudorapidity. Angular correlations of transverse momentum p_t in Au‐Au collisions access temperature/velocity structure resulting from low‐Q² parton scattering. p_t autocorrelations on (η,φ), obtained from the scale dependence of 〈p_t〉 fluctuations, reveal a complex parton dissipation process in heavy ion collisions which includes the possibility of collective bulk‐medium recoil in response to parton stopping.