论文标题
P-Wave Sommerfeld的增强接近阈值：一种简化的方法
P-wave Sommerfeld enhancement near threshold: a simplified approach
论文作者
论文摘要
已知在最终状态下具有不稳定颗粒的过程中P波sommerfeld增强的计算是不同的。在完整的描述中，包括共鸣（壳不稳定的颗粒）和非谐振贡献，已经表明结果是有限的。对于大多数标准模型应用程序，这些完整的计算不容易获得。在这项工作中，我们对接近阈值的地区感兴趣，我们仅考虑共鸣的贡献。在这种情况下，我们提供了简化的处方，以在不稳定粒子的狭窄宽度近似中计算P-Wave Sommerfeld的增强，从而直接消除了分歧。我们表明，我们可以以类似于通常的S-Wave Sommerfeld增强功能的方式来定义有限的共振贡献，而无需包含非谐振过程。
The calculation of P-wave Sommerfeld enhancement in processes with unstable particles in the final state is known to be divergent. In a complete description, where resonant (on-shell unstable particles) and non-resonant contributions are included, it has been shown that results are finite. For most beyond the Standard Model applications, these complete calculations are not readily available. In this work, we are interested in the near-threshold region and we consider only the resonant contribution. In this case, we provide a simplified prescription to compute the P-wave Sommerfeld enhancement in the narrow-width approximation of the unstable particle that directly eliminates divergences. We show that we can define a finite resonant contribution without the inclusion of the non-resonant processes in a way similar to the usual S-wave Sommerfeld enhancement.
