标题： COLLIER -- 用于单环积分的fortran库 显示英文标题

标题： COLLIER -- A fortran-library for one-loop integrals

摘要： 我们介绍了fortran库COLLIER，用于在微扰相对论量子场论中对单环标量和张量积分进行数值计算。 重要特性包括实现专用方法以在3-和4点张量积分中获得数值稳定性，支持内部粒子的复质量，以及可以选择维度正则化或质量正则化来处理红外奇异性。 COLLIER支持最多目前N=6的一环N点函数，并已在各种NLO QCD和EW计算中进行了测试。 显示英文摘要

摘要： We introduce the fortran-library COLLIER for the numerical evaluation of one-loop scalar and tensor integrals in perturbative relativistic quantum field theories. Important features are the implementation of dedicated methods to achieve numerical stability for 3- and 4-point tensor integrals, the support of complex masses for internal particles, and the possibility to choose between dimensional and mass regularization for infrared singularities. COLLIER supports one-loop N-point functions up to currently N=6 and has been tested in various NLO QCD and EW calculations.