计算主Lund射流平面密度
Calculating the primary Lund Jet Plane density
摘要：
Lund-jet飞机最近被提出作为一种功能强大的射流子结构工具，具有广泛的应用。在本文中，我们提供了一个全阶单对数计算的主要Lund平面密度在量子色动力学，包括贡献的运行的耦合，共线效应的领先部分子，和软矩阵，占大角度和集群效应。我们还确定了一个新的来源，集群的射流边界附近的musclums，推迟他们的remmation未来的工作。然后，我们匹配我们的所有顺序的结果，以准确的次领先的顺序预测。对于唯象的应用，我们补充我们的微扰计算与Monte Carlo估计的非微扰修正。在高横动量时，我们对Lund面密度的最终预测精度为5-7%，在微扰区域的下边缘（对应于约5 GeV的横动量），精度恶化到约20%。我们将我们的结果与最近在大型强子对撞机上ATLAS合作的测量结果进行比较，揭示了整个微扰域的良好一致性，即下降到约5 GeV。
英文摘要：
The Lund-jet plane has recently been proposed as a powerful jet substructure tool with a broad range of applications. In this paper, we provide an all-order single logarithmic calculation of the primary Lund-plane density in Quantum Chromodynamics, including contributions from the running of the coupling, collinear effects for the leading parton, and soft logarithms that account for large-angle and clustering effects. We also identify a new source of clustering logarithms close to the boundary of the jet, deferring their resummation to future work. We then match our all-order results to exact next-to-leading order predictions. For phenomenological applications, we supplement our perturbative calculation with a Monte Carlo estimate of non-perturbative corrections. The precision of our final predictions for the Lund-plane density is 5-7% at high transverse momenta, worsening to about 20% at the lower edge of the perturbative region, corresponding to transverse momenta of about 5 GeV. We compare our results to a recent measurement by the ATLAS collaboration at the Large-Hadron Collider, revealing good agreement across the perturbative domain, i.e. down to about 5 GeV.
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