不可见暗光子产生的暗区辐射修正：超越固定阶
Dark sector radiation corrections to invisible dark photon production: beyond fixed order
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中文总结 AI 辅助
针对正负电子对撞机不可见暗光子产生的固定阶计算微分分布发散问题，采用Sudakov重求和得到可积归一化的丢失质量平方分布，为暗光子搜寻提供更精准的理论依据。
中文摘要 AI 辅助
本文在暗阿贝尔希格斯模型下，以NLO（次领头阶）精度研究正负电子对撞机上的不可见暗光子产生过程，以及丢失质量平方$M_X^2$的物理分布。我们证明，过程$e^+e^-\to \u03b3A'$（其中$A'$为暗光子）的总截面固定阶修正具有红外安全性，但当暗区粒子质量远小于硬标度时，对应的$M_X^2$微分分布会出现准共线$1/M_X^2$发散。利用Sudakov重求和方法，我们得到了可积、归一化的$M_X^2$分布，该分布实际上是暗光子分支的“喷注质量”。我们还讨论了这些暗区修正对正负电子对撞机上不可见暗光子搜寻的影响。
英文摘要
In this work we study invisible dark photon production at electron-positron colliders in a dark Abelian Higgs model at NLO (next-to-leading-order), and the physical distribution of squared missing mass $M_X^2$. We show that the fixed order correction to the total cross section for the process $e^+e^-\to γA'$, with $A'$ the dark photon, is infrared-safe, but the corresponding differential distribution of $M_X^2$ reveals a quasi-collinear $1/M_X^2$ divergence when the masses of dark sector particles are much smaller than the hard scale. By using the Sudakov resummation method, we obtain an integrable, normalized distribution of $M_X^2$, which is actually the ``jet mass'' of the dark photon branch. We also discuss how these dark sector corrections impact the invisible dark photon search at electron-positron colliders.
