论文标题
NNLO的梁函数的自动计算
Automated Calculation of Beam Functions at NNLO
论文作者
论文摘要
我们提出了一个自动化框架，用于计算梁函数，该框架在扰动理论中描述了近临界领先顺序（NNLO）的强子围栏的共线初始状态辐射。通过利用共线矩阵元件的红外行为，我们将相位空间奇异性分解为合适的观察到独立的参数。我们的数值方法适用于一大批对撞机的可观察物，并且为了检查其有效性，我们计算了夸克束的功能，用于横向momentum重新召集和N杰特，在该顺序上在分析上以分析性地知道，找到了良好的一致性。
We present an automated framework for the calculation of beam functions that describe collinear initial-state radiation at hadron colliders at next-to-next-to leading order (NNLO) in perturbation theory. By exploiting the infrared behaviour of the collinear matrix elements, we factorise the phase-space singularities with suitable observable-independent parametrisations. Our numerical approach applies to a large class of collider observables, and as a check of its validity, we compute the quark beam functions for transverse-momentum resummation and N-jettiness, which are known analytically at this order, finding excellent agreement.
