PHENIX近边脊数据和光子喷流的动量反冲模型分析
Momentum Kick Model Analysis of PHENIX Near-Side Ridge Data and Photon Jet
摘要：
我们分析了PHENIX近侧脊数据的中心金+金碰撞在\sqrt{s_{NN}} =200 GeV的动量踢模型，其中近侧喷流出现在表面附近，踢中等部分子，失去能量，并成为触发粒子和碎裂产物的碎片。被踢的中等部分子随后具体化为所观察到的脊粒子，其携带关于早期部分子动量分布和动量踢的大小的直接信息。我们发现PHENIX脊数据可以用动量踢模型很好地描述，提取的早期部分子动量分布具有类热横向分布和快度平台结构。我们还发现，喷流部分子和介质部分子之间的部分子-部分子散射涉及到一个非微扰的坡密子的交换，喷流部分子在动量范围内考虑在近侧脊测量。
英文摘要：
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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