论文标题
使用Jetscape框架,P-P和PB-PB碰撞中的Photon-JET相关性
Photon-jet correlations in p-p and Pb-Pb collisions using JETSCAPE framework
论文作者
论文摘要
现在已经很好地确定,喷气式修饰是多阶段效应。因此,仅单个模型无法描述Jet修饰的所有方面。 Jetscape框架是一个多阶段框架,它使用多个模块通过QGP介质模拟喷气式传播的不同阶段。这些模拟需要一组参数,以确保阶段之间的平稳过渡。我们微调这些参数,以成功地描述各种可观察到的物品,例如领先的黑龙和喷气式,喷射形状和喷气片段化功能的核修饰因子。可以在硬散射中产生光子,也可以从喷气机内部的夸克产生。在这项工作中,我们研究了$ p-p $和$ pb-pb $碰撞系统的光子喷射横向动量不平衡和方位角相关性。在每个事件中产生的所有光子,包括来自硬散射的光子,来自Parton淋浴的辐射以及强调辐射的光子,都可以通过隔离切割来直接与实验数据进行比较。模拟使用与JET分析相同的调谐参数进行。没有引入或调整新参数。与先前的努力相比,我们证明了与$ PB-PB $碰撞的光子的一致性大大改善。这项工作提供了多阶段演化框架的独立无参数验证。
It is now well established that jet modification is a multistage effect; hence a single model alone cannot describe all facets of jet modification. The JETSCAPE framework is a multistage framework that uses several modules to simulate different stages of jet propagation through the QGP medium. These simulations require a set of parameters to ensure a smooth transition between stages. We fine tune these parameters to successfully describe a variety of observables, such as the nuclear modification factors of leading hadrons and jets, jet shape, and jet fragmentation function. Photons can be produced in the hard scattering or as radiation from quarks inside jets. In this work, we study photon-jet transverse momentum imbalance and azimuthal correlation for both $p-p$ and $Pb-Pb$ collision systems. All the photons produced in each event, including the photons from hard scattering, radiation from the parton shower, and radiation from hadronization are considered with an isolation cut to directly compare with experimental data. The simulations are conducted using the same set of tuned parameters as used for the jet analysis. No new parameters are introduced or tuned. We demonstrate a significantly improved agreement with photons from $Pb-Pb$ collisions compared to prior efforts. This work provides an independent, parameter free verification of the multistage evolution framework.