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arXiv 0902.0325hep-ph
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D0C:计算具有复数质量的标量单圈四点积分的代码

D0C : A code to calculate scalar one-loop four-point integrals with complex masses

Dao Thi Nhung, Le Duc Ninh

摘要:

本文在t Hooft和Veltman方法的基础上,给出了一个计算含复内质量的标量单圈四点积分的新的Fortran程序。当外动量满足一定的物理条件时,本准则是适用的。特别是,如果一个外部动量或它们的总和是类时或类光的,因此涵盖了对撞机上的所有物理过程,它就成立。所有与无质量的外部粒子有关的特殊情况都是分开处理的。讨论了与数值计算和朗道奇点有关的一些技术问题。

英文摘要:

We present a new Fortran code to calculate the scalar one-loop four-point integral with complex internal masses, based on the method of 't Hooft and Veltman. The code is applicable when the external momenta fulfill a certain physical condition. In particular it holds if one of the external momenta or a sum of them is timelike or lightlike and therefore covers all physical processes at colliders. All the special cases related to massless external particles are treated separately. Some technical issues related to numerical evaluation and Landau singularities are discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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