论文标题
在未来的$ z $ - fectories中搜索重型中微子
Monojet search for heavy neutrinos at future $Z$-factories
论文作者
论文摘要
沉重中微子的存在是类似I类型的机制的最突出的特征，它自然地解释了观察到的中微子的微量。已经进行了各种实验来寻找沉重的中微子，梅森腐烂对重型中微子的敏感比$ b $ ersons敏感，并且对大于$ \ Mathcal {o}（O}（O}（0.1）的质量敏感的实验敏感。在两者之间，这两种实验发现了一个大规模差距，通过这项工作，我们通过该过程通过$ e^{ - } e^{ - } e^{+} e^{+rightArolrow z \ rightarrow z \ rightArrow z \rightarrowνn\rightarrowνn\ rightArrow维\ ell \ el \ e =基于信号和背景事件的模拟，我们发现信号显示为具有大型中微子的大型Lorentz增强的单速事件。此外，这种单射流的子结构对于重建信号并抑制背景至关重要。信号过程横截面和混合参数$ {|的上限上的上限V _ {\ ell n} |}^2 $。与其他实验相比，将来的$ z $ factories的单夹量方法将能够填补该质量范围内的空白。
The existence of heavy neutrinos is the most prominent feature of type-I seesaw-like mechanisms, which naturally explain tiny masses of observed neutrinos. Various experiments have been conducted to search for heavy neutrinos, with meson decays sensitive to heavy neutrinos lighter than $B$ mesons and high energy collider experiments sensitive to the ones with masses larger than $\mathcal{O}(0.1)$ TeV. In between, there is a mass gap uncovered by these two kinds of experiments, and by this work, we investigate the 3-15 GeV neutrino searches at future $Z$-factories via the process $e^{-}e^{+}\rightarrow Z \rightarrow νN \rightarrow ν\ell\bar{q}q'$ with $\ell=e,μ$. Based on the simulation of signal and background events, we find that the signals appear as monojet events owning to the large Lorentz boost of the heavy neutrinos. Furthermore, the substructures of such monojet are essential to reconstruct the signal and suppress the background. The upper bounds on the cross section of the signal process and the mixing parameter ${| V_{\ell N}|}^2$ are obtained. Compared with other experiments, the monojet method at future $Z$-factories will be able to fill the gap around this mass range.
