标题： 关于$t$-信道奇点的解析描述 显示英文标题

标题： An Analytic Prescription for $t$-channel Singularities

摘要： $t$通道奇点是在稳定粒子在$t$通道散射过程中变成壳上状态时，在散射振幅中出现的发散现象。这种情形出现在对撞机实验系统中，或者在宇宙学粒子产生的背景下。目前还没有普遍适用的方法。在这项工作中，我们提出了一种新的公式来识别和消除发散的来源。该方案完全是解析的，并且可以预期各种应用。这项工作在这个研究领域提供了一个有价值的工具。 显示英文摘要

摘要： The $t$-channel singularity is a divergence in the scattering amplitude which occurs when a stable particle propagating in $t$-channel scattering process becomes an on-shell state. Such situations appear either in the system of collider experiments or in the context of the cosmological particle production. No scheme which is generally applicable is known. In this work, we propose a new formulation to identify and remove the source of the divergence. The scheme is fully analytical and various applications can be expected. This work provides a valuable tool in this research field.