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arXiv 0907.4403nucl-ex
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在CERN SPS上研究核子-核子和核-核碰撞中高pT角关联的来源

Investigating Sources of Angular Correlations at High pT in Nucleon-Nucleon and Nucleus-Nucleus Collisions at the CERN SPS

Marek Szuba

摘要:

高pT强子的角关联可以作为探测高能重离子碰撞中产生的部分子与稠密介质相互作用的探针,但在SPS能量下,其他效应也可能很重要。为了研究各种贡献,NA 49进行了能量和系统尺寸扫描的两粒子方位角相关的Pb+Pb,Si+Si和p+p碰撞在sqrt(sNN)= 17.3 GeV,以及中央Pb+Pb碰撞在6.3,7.6,8.8和12.3 GeV。这些结果进行了比较UrQMD模拟。NA 49结果表明,在中心Pb+Pb(Au+Au)碰撞中,C2(dphi)的远离侧变平,即使在低SPS能量下,这种远离侧也与碰撞能量有微弱的依赖关系。这与部分子能量损失的标准情况不一致。另一方面,近侧的峰值振幅下降明显降低碰撞能量,变成低于sqrt(sNN)= 8.8 GeV的耗尽。UrQMD描述了远离侧的关联函数,但不同意在近侧。

英文摘要:

Angular correlations of high-pT hadrons can serve as a probe of interactions of partons with the dense medium produced in high-energy heavy-ion collisions but other effects may also be important at SPS energies. To study the various contributions, NA49 has performed an energy and system-size scan of two-particle azimuthal correlations in Pb+Pb, Si+Si and p+p collisions at sqrt(sNN) = 17.3 GeV, as well as central Pb+Pb collisions at 6.3, 7.6, 8.8 and 12.3 GeV. These results were compared to UrQMD simulations. NA49 results show a flattened away side of C2(dphi) in central Pb+Pb (Au+Au) collisions which depends weakly on collision energy even for low SPS energies. This is at odds with the standard scenario of parton energy loss. On the other hand, the near-side peak amplitude drops visibly with decreasing collision energy, turning into a depletion below sqrt(sNN) = 8.8 GeV. UrQMD describes the correlation functions on the away side but disagrees on the near side.

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