2009/01/31 by Cheuk-Yin Wong
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1103/physrevc.80.034908
published as Phys.Rev.C80:034908,2009 · 20 pages, 3 figures
openalex publication_date 2009/09/28 · arxiv created 2009/10/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We analyze PHENIX near-side ridge data for central Au+Au collisions at √sNN=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 nonperturbative pomeron, for jet partons in momentum range considered in the near-side ridge measurements.