论文标题
Belle II的长寿命中性阳光
Long-lived light neutralinos at Belle II
论文作者
论文摘要
我们认为，在R-Pary-Afciolating（RPV）超对称性的背景下，我们考虑了Belle II的$τ$ Lepton Rare腐烂产生的质量的光中和质量。在Belle II实验中产生的$τ$ lept子的大型和干净的样品，对这种光中性的敏感性具有出色的敏感性，并有望具有移位顶点的外来特征。我们专注于单个RPV运算符的两个基准方案，$λ'_ {311} l_3 q_1 \ bar {d} _1 $和$λ'_ {312} l_3 Q_1 \ bar {d} _2 _2 $，这既诱导最轻度的中性粉的产生和衰减。为了重建位移的顶点，我们在最终状态中至少需要两个带电的乳头。我们对信号和背景事件进行蒙特卡罗模拟，发现Belle II可以在参数空间中探索与其他探针竞争的区域。特别是，对于$λ'_{311} $方案，它最多可以比当前边界强两个数量级。
We consider light neutralinos of mass about 1 GeV, produced from $τ$ lepton rare decays at Belle II, in the context of R-parity-violating (RPV) supersymmetry. With large and clean samples of $τ$ leptons produced at the Belle II experiment, excellent sensitivity to such light neutralinos with the exotic signatures of displaced vertices is expected. We focus on two benchmark scenarios of single RPV operators, $λ'_{311} L_3 Q_1 \bar{D}_1$ and $λ'_{312} L_3 Q_1 \bar{D}_2$, which induce both the production and decay of the lightest neutralino. For the reconstruction of a displaced vertex, we require at least two charged pions in the final states. We perform Monte-Carlo simulations for both signal and background events, and find that Belle II can explore regions in the parameter space competitive with other probes. In particular, for the $λ'_{311}$ scenario, it can put limits up to two orders of magnitude stronger than the current bounds.
