AI 中文总结
该研究针对强度前沿轻暗物质实验，采用多体从头算方法结合手征有效场论，计算三种核的轻暗物质信号率，发现准弹性处理可使信号产额最多提升两个数量级。
AI 中文摘要
基于强度前沿的加速器实验，即高能束流轰击核靶，是探测轻暗物质范式的有力工具。这类实验需要对靶核进行精确建模，以获得可靠的信号预测结果。我们将多体从头算方法应用于电子固定靶实验中轻暗物质中介子产生信号率的计算，采用手征有效场论相互作用。考虑弹性散射和准弹性散射，我们使用蒙特卡洛事件生成器实现来计算截面，该实现基于$^{20}$Ne、$^{34}$Si和$^{56}$Fe三种代表性核的从头算核弹性形状因子和谱函数，且对应不同的电子束能量。我们将所得结果与常用的唯象参数化方法进行比较，发现采用准弹性处理后信号产额最多提高两个数量级，且对于较轻的中介子两者结果一致。
英文摘要
Accelerator-based experiments at the intensity frontier, in which a high-energy beam impinges on a nuclear target, serve as powerful probes of the light dark matter paradigm. Such experiments require precise modeling of the target nucleus for reliable signal predictions. We present the application of a many-body ab initio method to calculate light dark matter mediator production signal rates at electron fixed-target experiments, using chiral effective field theory interactions. Considering both elastic and quasi elastic scattering, we compute cross sections using a Monte Carlo event generator implementation informed by ab initio nuclear elastic form factors and spectral functions for three representative nuclei, $^{20}$Ne, $^{34}$Si, and $^{56}$Fe, at varying electron beam energies. We compare our results to a commonly used phenomenological parameterization, finding an increased signal yield by up to two orders of magnitude with our quasi elastic treatment and an agreement for lighter mediators.
Comments8 pages, 5 figures
