QCD中次首阶计算的自动化：FKS减法
Automation of next-to-leading order computations in QCD: the FKS subtraction
摘要：
我们提出了由Frixione，Kunszt和Signer提出的用于计算QCD中次领先阶的任何截面的通用减法形式。给定一个过程，外部提供的唯一成分是虚拟源的红外和紫外有限贡献。我们的实现，目前仅限于e+e-碰撞的情况下，是建立在MadGraph的基础上，并以相同的方式工作。它特别适合于并行计算，并且它可以处理由MadGraph中实现的理论产生的任何物理过程，因此包括标准模型以及超越标准模型理论。我们给出了一些示例过程的结果，这些过程记录了实现的性能，并特别显示了减法项的数量如何随着最终状态的多重性而非常温和地增长。
英文摘要：
We present the complete automation of the universal subtraction formalism proposed by Frixione, Kunszt, and Signer for the computation of any cross section at the next-to-leading order in QCD. Given a process, the only ingredient to be provided externally is the infrared- and ultraviolet-finite contribution of virtual origin. Our implementation, currently restricted to the case of e+e- collisions, is built upon and works in the same way as MadGraph. It is particularly suited to parallel computation, and it can deal with any physical process resulting from a theory implemented in MadGraph, thus including the Standard Model as well as Beyond the Standard Model theories. We give results for some sample processes that document the performances of the implementation, and show in particular how the number of subtraction terms has an extremely mild growth with final-state multiplicity.
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