近日，美国南达科他大学的Varun Vaidya及其研究团队取得一项新进展。经过不懈努力，他们实现重离子碰撞中分解射流可观测量的辐射修正。相关研究成果已于2024年5月3日在国际知名学术期刊《高能物理杂志》上发表。

该研究团队专注于重离子碰撞中射流子结构分解截面的研究，特别关注了介质结构函数和介质诱导射流函数的重整化。他们的工作基于[1]中开发的形式论，这一理论结合了开放量子系统方法和有效场论（EFT）来处理前向散射过程，以推导出作为长寿命的稀夸克胶子等离子体（QGP）介质硬探针的射流观测物的分解公式。

研究揭示，这些可观测的QGP独立物理的通用介质结构函数，在介质诱导的轫致辐射影响下，会表现出特定的速度和UV异常维度。进一步得出了与BFKL方程和QCD耦合运行相对应的重整化群（RG）方程。他们提出了基于这些RG方程对介质中射流平均自由程恢复进行数值影响的初步结果。此外，研究人员还简要探讨了将该形式论应用于短寿命稠密介质的前景。

附：英文原文

Title: Radiative corrections for factorized jet observables in heavy ion collisions

Author: Vaidya, Varun

Issue&Volume: 2024-05-03

Abstract: I look at the renormalization of the medium structure function and a medium induced jet function in a factorized cross section for jet substructure observables in Heavy Ion collisions. This is based on the formalism developed in [1], which uses an Open quantum system approach combined with the Effective Field Theory (EFT) for forward scattering to derive a factorization formula for jet observables which work as hard probes of a long lived dilute Quark Gluon Plasma (QGP) medium. I show that the universal medium structure function that captures the observable independent physics of the QGP has both rapidity and UV anomalous dimensions that appear due to medium induced Bremsstrahlung. The resulting Renormalization Group (RG) equations correspond to the BFKL equation and the running of the QCD coupling respectively. I present the first results for the numerical impact of resummation using these RG equations on the mean free path of the jet in the medium. I also briefly discuss the prospects of extending this formalism for a short lived dense medium.

DOI: 10.1007/JHEP05(2024)028

Source: https://link.springer.com/article/10.1007/JHEP05(2024)028