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arXiv 0810.5071hep-ph
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SHERPA粒子衰变中的软光子辐射

Soft Photon Radiation in Particle Decays in SHERPA

Marek Schoenherr, Frank Krauss

摘要:

本文用Yennie-Frautschi-Suura方法模拟了粒子衰变中的真实和虚拟QED修正。它利用软光子修正的通用结构,将主要的对数QED修正恢复到所有的阶数,并且它允许对这个近似结果进行系统的修正,以使微扰理论的结果精确到固定阶数。该方法已被实施为蒙特卡罗算法,后验修改衰变矩阵元素,通过发射不同数量的光子。相应的计算机代码被纳入SHERPA事件生成器框架。

英文摘要:

In this paper the Yennie-Frautschi-Suura approach is used to simulate real and virtual QED corrections in particle decays. It makes use of the universal structure of soft photon corrections to resum the leading logarithmic QED corrections to all orders, and it allows a systematic correction of this approximate result to exact fixed order results from perturbation theory. The approach has been implemented as a Monte Carlo algorithm, which a posteriori modifies decay matrix elements through the emission of varying numbers of photons. The corresponding computer code is incorporated into the SHERPA event generator framework.

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