论文标题
光子拆分校正到软量重新召集
Photon splitting corrections to soft-photon resummation
论文作者
论文摘要
在本文中，我们提出了一种算法，以在Yennie-Frautschi-Suura式的软photon重新调整中添加光子分解校正，可在Sherpa Monte-Carlo事件生成器中提供。在QED中的NNLO中输入光子拆分校正，并且由于这些效果未纳入标准的QED FSR重新召集中，因此它们的大小大于相同顺序的纯硬光子发射校正。我们引入了不同的Lepton敷料策略，除习惯光子外，还结合了进一步的Lepton和Hadron，并讨论了它们对圆锥体大小等敷料参数的敏感性。最后，我们将光子分割的影响量化为不同的敷料策略下的电荷费米和标量的影响，对$ z \ to e^+e^ - $衰减，并发现对与梳妆台大小相关的适当包容性敷料策略的效果，并且在大型装扮过程中仅使用光子，最多可与梳妆台大小相关，最高9％。
In this paper we present an algorithm to add photon-splitting corrections to the Yennie-Frautschi-Suura-style soft-photon resummation available in the Sherpa Monte-Carlo event generator. Photon-splitting corrections enter at NNLO in QED and, as these effects are not incorporated in the standard QED FSR resummations, their size is larger than the pure hard photon-emission corrections at the same order. We introduce different lepton dressing strategies which incorporate further leptons and hadrons in addition to the customary photons, and discuss their sensitivity to dressing parameters such as the cone size. Finally, we quantify the effects of photon splittings into charged fermions and scalars under different such dressing strategies on $Z\to e^+e^-$ decays and find effects of up to 1% for suitably inclusive dressing strategies independent of the dressing cone size, and up to 9% if only photons are used in the dressing procedure with large dressing cones.
