无IR发散条件下$e^{+}e^{-}\rightarrowμ^{+}μ^{-}γ$过程末态辐射软光子高能极限的计算
Calculation without IR divergence of the soft photon high energy limit of final state radiation for the process $e^{+}e^{-}\rightarrowμ^{+}μ^{-}γ$
摘要：
本文指出，如果对树能级的末态辐射过程$e^{+}e^{-}\rightarrowμ^{+}μ^{-}γ$的Feynman振幅所引起的某一分布对象（实际上是一种测度）作仔细处理，则在软光子高能极限下，该过程与红外发散无关。因此，不需要与该过程相关的“红外灾难”。它表明，事实上，截面的末态光子的过程中消失的软光子的高能量极限。
英文摘要：
In this paper it is shown that the final state radiation process $e^{+}e^{-}\rightarrowμ^{+}μ^{-}γ$ at tree level is not associated with any IR divergence in the soft photon high energy limit if the calculation is done using a careful treatment of a certain distributional object (in fact, a measure) arising from the Feynman amplitude for the process. Thus there need be no "infrared catastrophe" associated with the process. It is shown that, in fact, the cross section for the final state photons for the the process vanishes in the soft photon high energy limit.
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