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Jet quenching test of the QCD matter created at RHIC and the LHC needs opacity-resummed medium induced radiation

机译:在RHIC和LHC时产生的QCD物质的喷射淬火试验需要不透明的媒体诱导辐射

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After almost two decades of investigation, jet quenching has become a fundamental tool to study the properties of the QCD matter produced in high-energy nuclear collisions. Despite the large progress in both experimental and theoretical tools, several unknowns remain to be solved. In particular the systematics of the QCD matter parameters extracted at different energies and centralities is still puzzling. On the other hand, a lot of attention has been put in the last few years to a correct resummation of the multiple scatterings that the particles of the jet suffer when traversing the QCD matter. Present formalisms have substantially improved the multiple-soft or single hard scattering approximations, common in the last twenty years. We show here that medium parameters extracted with full resummed medium-induced gluon radiation spectra significantly differ from these two extreme approximations, providing natural systematics for different collision energies and centralities, with no inconsistencies. For the case of the full resummation this ensures that the density of scattering centers as a function of the temperature qualitatively agrees with the equation of state computed in lattice QCD.
机译:在近二十年的调查之后,喷射淬火已成为研究高能量核碰撞中产生的QCD物质的性质的基本工具。尽管两个实验和理论工具中的进展较大,但仍有几个未知数仍有待解决。特别地,在不同能量和集合处提取的QCD物质参数的系统仍然是令人费解的。另一方面,在过去几年中,在过去几年中,对射流颗粒在横穿QCD物质时颗粒的正确重新突出的重大关注。目前的形式主义显着改善了多重软或单个硬散射近似,在过去二十年中常见。我们在这里展示了用全新的中等诱导的胶合辐射谱提取的中等参数与这两个极端近似显着不同,为不同的碰撞能量和集合提供自然系统,没有不一致。对于完全开始的情况,这确保了作为温度的函数的散射中心的密度定性同意格子QCD中计算的状态方程。

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