论文标题
量规不变性和两光子过程的振幅
Gauge invariance and amplitudes of two-photon processes
论文作者
论文摘要
提出了一种推导许多两光子振幅的方便表示的方法。它基于光子传播器仅具有空间成分的量规的使用。获得的幅度没有任何强大的数值取消，因此对于数值评估非常方便。考虑过程$ e^+e^ - \ to e^+e^-e^+e^ - $，$ e^+e^ - \ rightArrow e^+e^+e^+μ^+μ^ - $和$ e^+e^ - \ toμ^+μ^+μ^+μ^-π^+π^ - $。该方法在极化颗粒的情况下扩展。在这种方法中获得的幅度已用于扩展F.A. Berends，P.H。开发的事件发生器。 Daverveldt和R. Kleiss。
A method to derive the convenient representations for many two-photon amplitudes is suggested. It is based on the use of the gauge in which the photon propagator has only space components. The amplitudes obtained have no any strong numerical cancellations and, therefore, are very convenient for numerical evaluations. Our approach is illustrated by the consideration of the processes $e^+e^-\to e^+e^-e^+e^-$, $e^+e^-\rightarrow e^+e^-μ^+μ^-$, and $e^+e^-\to μ^+μ^-π^+π^-$. The method is extended on the case of polarized particles. The amplitudes obtained in this approach have been employed for extension of the event generator developed by F.A. Berends, P.H. Daverveldt, and R. Kleiss.
