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Low-$Q^2$ partons in p-p and Au-Au collisions

Thomas A. Trainor
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Abstract

We describe correlations of low-$Q^2$ parton fragments on transverse rapidity $y_t$ and angles $(η,ϕ)$ from p-p and Au-Au collisions at $\sqrt{s} =$ 130 and 200 GeV. 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-$Q^2$ 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-$Q^2$ parton scattering. $p_t$ autocorrelations on $(η,ϕ)$, obtained from the scale dependence of $ $ 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.

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Thomas A. Trainor. 2005-10-11. Low-$Q^2$ partons in p-p and Au-Au collisions. https://doi.org/10.1063/1.2197422

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