论文标题
预计的Na62对重型中性Lepton生产的敏感性$ k^+ \toπ^0 e^+ n $衰减
Projected NA62 sensitivity to heavy neutral lepton production in $K^+ \to π^0 e^+ N$ decays
论文作者
论文摘要
重型中性瘦素（HNL）出现在粒子物理标准模型的许多扩展中。在这项研究中，我们通过在$ k^+ \至π^0 e^0 e^+ n $中进行飞行中缺少质量搜索，研究了CERN的Na62实验可以改善HNL混合角$ | U_E |^2 $的现有界限。我们表明，限制$ | u_e |^2 \ simeq 2 \ times 10^{ - 6} $可以使用质量范围125-144 MEV的当前可用数据来达到，目前尚未覆盖生产搜索。将来的数据，以及专用触发器和/或改进拒绝吸收率光子，可以通过另一个数量级来提高此限制。
Heavy neutral leptons (HNLs) appear in many extensions of the Standard Model of particle physics. In this study, we investigate to which extent the NA62 experiment at CERN could improve the existing bounds on the HNL mixing angle $|U_e|^2$ by performing a missing mass search in $K^+ \to π^0 e^+ N$ decays in flight. We show that the limit $|U_e|^2 \simeq 2\times 10^{-6}$ can be reached with the currently available data in the mass range 125 -- 144 MeV, which is currently not well covered by production searches. Future data, together with a dedicated trigger and/or improvements in rejection of out-of-acceptance photons, can improve this limit by another order of magnitude.
