论文标题
在Belle II的流离失所搜索光线玻色子
Displaced Searches for Light Vector Bosons at Belle II
论文作者
论文摘要
Belle II实验的设计光度为50 AB $^{ - 1} $，并且具有跟踪功能的检测器，Belle II实验是搜索颗粒的理想实验室，这些实验室是搜索粒子，这些粒子薄弱地与标准型号且具有特征性的衰减长度为几厘米，等等。我们表明，对于黑暗光子和其他光矢量玻色子的模型，Belle II将成功探测参数空间的区域，而该参数空间目前尚未通过任何实验来探索。另外，对于矢量玻色子夫妇的模型，与Muons相比，将矢量与电子和夸克相比，例如在$L_μ-L_τ$模型中，Belle II将探测质量和耦合与MUON异常磁矩兼容的区域。我们讨论了这些结果，并得出了Belle II对其他少数模型的预计灵敏度。最后，即使有了当前累积的数据，$ \ sim 200 $ fb $^{ - 1} $，Belle II也应该能够覆盖与X（17）玻色子有关的参数空间区域，以解决Atomki异常。
With a design luminosity of 50 ab$^{-1}$ and detectors with tracking capabilities extending beyond 1 m, the Belle II experiment is the perfect laboratory for the search of particles that couple weakly to the Standard Model and have a characteristic decay length of a few centimetres and more. We show that for models of dark photons and other light vector bosons, Belle II will be successful in probing regions of parameter space which are as of now unexplored by any experiment. In addition, for models where the vector boson couples sub-dominantly to the electron and quarks as compared to muons, e.g. in the $L_μ-L_τ$ model, Belle II will probe regions of mass and couplings compatible with the anomalous magnetic moment of muon. We discuss these results and derive the projected sensitivity of Belle II for a handful of other models. Finally, even with the currently accumulated data, $\sim 200$ fb$^{-1}$, Belle II should be able to cover regions of parameter space pertaining to the X(17) boson postulated to solve the ATOMKI anomaly.
