RECOLA2: REcursive Computation of One-Loop Amplitudes 2
RECOLA2: REcursive Computation of One-Loop Amplitudes 2
复制标题
DOI：
10.1016/j.cpc.2017.11.013
复制
发表时间：
2017-05
期刊：
影响因子：
--
通讯作者：
A. Denner;J. Lang;S. Uccirati
中科院分区：
文献类型：
--
作者：
A. Denner;J. Lang;S. Uccirati
本文介绍了用Fortran 95程序Recola 2微扰计算粒子物理标准模型和扩展Higgs扇区中次-首阶跃迁振幅的方法。新的理论是通过模型文件实现的't Hooft-Feynman规范在传统的制定量子场论和背景场方法。目前的版本包括标准模型的双希格斯-双重态模型和希格斯-单重态扩展的模型文件。我们支持标准模型的标准重整化方案，以及许多常用的重整化方案在扩展希格斯部门。在这些模型中，对于任何过程，次超前阶极化振幅和平方振幅的计算（可选地，在自旋和颜色上求和）都是完全自动化的。Recola 2允许计算偶极减法公式中所需的颜色和自旋相关的超前阶平方振幅。Recola 2可在www.example.com上公开下载http://recola.hepforge.org.Programhttp://dx.doi.org/10.17632/sn4wvmkd9k.1Licensing。在相对论量子场论中计算可观测量时出现的一般树级和单圈散射振幅的评估。解决方法：树级和单圈振幅使用递归算法进行数值计算。对于单圈振幅，需要张量积分的数值结果作为输入。这些都是由collierlibrary提供的。此外，反项和有理项的贡献通过专门的Feynman规则来确定。限制：该代码已用于单圈水平上最多9个外部粒子和树水平上最多10个外部粒子的过程。对于大的多重性，可用的内部存储可能会导致限制。目前，除了标准模型之外，还支持标准模型的双希格斯双重态模型和希格斯单重态扩展。
We present the Fortran95 programRecola2for the perturbative computation of next-to-leading-order transition amplitudes in the Standard Model of particle physics and extended Higgs sectors. New theories are implemented via model files in the ’t Hooft–Feynman gauge in the conventional formulation of quantum field theory and in the Background-Field method. The present version includes model files for Two-Higgs-Doublet Model and the Higgs-Singlet Extension of the Standard Model. We support standard renormalization schemes for the Standard Model as well as many commonly used renormalization schemes in extended Higgs sectors. Within these models the computation of next-to-leading-order polarized amplitudes and squared amplitudes, optionally summed over spin and colour, is fully automated for any process.Recola2allows the computation of colour- and spin-correlated leading-order squared amplitudes that are needed in the dipole subtraction formalism.Recola2is publicly available for download at http://recola.hepforge.org.Program summaryProgram Title:Recola2Program Files doi:http://dx.doi.org/10.17632/sn4wvmkd9k.1Licensing provisions:GNU GPL version 3Programming language:Fortran95Nature of problem:Evaluation of general tree-level and one-loop scattering amplitudes occurring in the calculation of observables in relativistic quantum field theories.Solution method:Tree-level and one-loop amplitudes are numerically calculated using a recursive algorithm. For one-loop amplitudes numerical results for tensor integrals are needed as input. These are provided by theCollierlibrary. In addition, contributions of counterterms and rational terms are determined via dedicated Feynman rules.Restrictions:The code has been used for processes with up to 9 external particles at one-loop level and up to 10 external particles at tree level. For large multiplicities available internal storage may cause limitations. Presently besides the Standard Model, the Two-Higgs-Doublet Model and the Higgs-singlet extension of the Standard Model are supported.