通过高阶电磁矩在LDMX产生暗光子：模拟与模型判别
Production of Dark Photons through Higher Electromagnetic Moments at LDMX: Simulations and Model Discrimination
AI总结：
本研究将LDMX对亚GeV暗物质的探测灵敏度扩展至由圈图高阶电磁矩产生的暗光子，分析了四种附加相互作用在LDMX Phase-II中的运动学分布，发现结合反冲电子能量与横向动量可部分打破暗光子质量与模型间的简并性以实现模型判别。
摘要：
我们将LDMX对亚GeV暗物质（DM）的预期灵敏度扩展到通过高阶电磁矩产生的暗光子情形。这些矩源于涉及portal matter场以及新对称群规范场的圈图。由于这些附加相互作用的Lorentz结构（特别是动量依赖性），在缺失动量/能量实验中预期的运动学分布不仅随暗光子质量变化，也随模型而异。通过考虑四种附加相互作用类型——磁偶极矩、电偶极矩、电荷半径和anapole矩——我们表明LDMX Phase-II预计能够探测这些附加暗光子模型的遗迹目标。我们比较了计算暗轫致辐射截面的解析方法与数值方法，并计算了每个模型的运动学分布。我们讨论了在LDMX存在非零信号事件情况下的模型判别潜力。我们发现暗光子质量与模型之间存在简并性，通过同时考虑反冲电子的能量和横向动量，可以部分打破这种简并性。
英文摘要：
We extend the projected sensitivity of LDMX for sub-GeV dark matter (DM) to the case of dark photons produced through higher order electromagnetic moments. These moments arise from loop diagrams involving portal matter fields, along with the gauge fields of new symmetry groups. Due to the Lorentz structures, in particular the momentum dependence, of these additional interactions, the kinematic distributions expected at missing momentum/energy experiments vary with model in addition to dark photon mass. By considering four additional types of interactions -- magnetic and electric dipole, charge radius, and anapole moment -- we show that LDMX Phase-II is expected to probe the relic target of these additional dark photon models. We compare the analytic with the numerical methods for calculating the dark bremsstrahlung cross section, and compute the kinematic distributions for each model. The potential for model discrimination in the scenario of non-zero signal events at LDMX is discussed. We find that there is a degeneracy between the dark photon mass and model, which can be partially broken by considering both the energy and the transverse momentum of the recoil electron.
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