arXiv 1105.23452011-05-12nucl-thhep-exhep-phnucl-ex

高能核碰撞中3vs2末态粒子的方位角关联的宽距面

The broad away side of azimuthal correlations: 3 vs 2 final state particles in high energy nuclear collisions

Alejandro Ayala, Jamal Jalilian-Marian, J. Magnin, Antonio Ortiz, G. Paic, Maria Elena Tejeda-Yeomans

备注：: Prepared for the 5th International Workshop on High-pT Physics at LHC, ICN-UNAM, 27 Sep.-1 Oct, 2010
发表信息：: AIP Conf.Proc.1348:86-94,2011
DOI：: 10.1063/1.3579435

摘要：

在RHIC的高能重离子碰撞中，介质诱导动力学的一些重要方面至今还没有得到很好的理解。特别是在Au+Au碰撞的方位角相关研究中，出现了一个加宽的甚至是双峰结构的远离侧峰，这在相同能量的p+p碰撞中是不存在的。这些特征已经存在，但在p+p碰撞中被抑制：2到3个部分子过程产生这样的结构，但相对于2到2个过程被抑制。我们认为，在A+A碰撞的不同的几何形状的轨迹3，而不是2粒子在最终状态，连同介质引起的能量损失的影响，在不同的截面，创建一个方案，增强过程中的3粒子在最终状态，这给出了平均这种双峰结构。

英文摘要：

In high energy heavy ion collisions at RHIC there are important aspects of the medium induced dynamics, that are still not well understood. In particular, there is a broadening and even a double hump structure of the away-side peak appearing in azimuthal correlation studies in Au+Au collisions which is absent in p+p collisions at the same energies. These features are already present but suppressed in p+p collisions: 2 to 3 parton processes produce such structures but are suppressed with respect to 2 to 2 processes. We argue that in A+A collisions the different geometry for the trajectories of 3 as opposed to 2 particles in the final state, together with the medium induced energy loss effects on the different cross sections, create a scenario that enhances processes with 3 particles in the final state, which gives on average this double hump structure.

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