论文标题
重型离子碰撞中的喷气碎片功能
Jet fragmentation function in heavy-ion collisions
论文作者
论文摘要
我们研究了通过扰动QCD中浓密的夸克 - 胶质等离子体传播的喷气机的碎片化功能。我们的核修饰因子的结果与LHC的PB+PB碰撞中的实验数据定性一致。特别是，我们在相对较软和相对较大的横向动量上复制了数据中看到的增强功能，并具有明确的物理解释。然而，由于碎片函数不是红外安全量，扰动预测对模仿限制量表的红外截止值非常敏感。为了解决这个问题，我们提出了一个新的可观察到的可观察的 - （主要）征片片段化函数 - 红外安全，并且具有类似于碎片函数的特征。我们为可观察到的真空和重型离子碰撞提供了预测，可以根据实验数据进行测试。
We study the fragmentation function of jets propagating through a dense quark-gluon plasma within perturbative QCD. Our results for its nuclear modification factor are in qualitative agreement with the experimental data in Pb+Pb collisions at the LHC. In particular, we reproduce the enhancements seen in the data at both relatively soft and relatively large transverse momenta, with clear physical interpretations. The perturbative predictions however are quite sensitive to the value of the infrared cutoff mimicking the confinement scale, due to the fact that the fragmentation function is not an infrared safe quantity. To remedy this, we propose a new observable -- the (primary) subjet fragmentation function -- which is infrared safe and has features similar to the fragmentation function. We provide predictions for this observable in the vacuum and in heavy-ion collisions that could be tested against the experimental data.
