Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-01-07
Phys.Rev.C80:034908,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages, 3 figures
Scientific paper
10.1103/PhysRevC.80.034908
We analyze PHENIX near-side ridge data for central Au+Au collisions at \sqrt{s_{NN}}=200 GeV with the momentum kick model, in which a near-side jet emerges near the surface, kicks medium partons, loses energy, and fragments into the trigger particle and fragmentation products. The kicked medium partons subsequently materialize as the observed ridge particles, which carry direct information on the early parton momentum distribution and the magnitude of the momentum kick. We find that the PHENIX ridge data can be described well by the momentum kick model and the extracted early partons momentum distribution has a thermal-like transverse distribution and a rapidity plateau structure. We also find that the parton-parton scattering between the jet parton and the medium parton involves the exchange of a non-perturbative pomeron, for jet partons in momentum range considered in the near-side ridge measurements.
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