论文标题
在Proton-Electron Colliders的$τ$最终状态中搜索重型Majorana Neutminos
Search for heavy Majorana neutrinos in the $τ$ final state at proton-electron colliders
论文作者
论文摘要
我们利用Lepton数字违规信号过程$ p \，e^ - \ toτ^+ jjj $在未来的质子电子墙面上搜索较重的Majorana Neutrinos。 LHEC（FCC-EH）被认为具有60 GEV的电子束能，质子束能量为7（50）TEV和1（3）AB $^{ - 1} $的质子束能量，并且电子束被认为是不固定的。我们应用检测器配置并模拟信号和相关的标准模型背景事件，用于HADRONIC $τ_H$和Leptonic $τ_\ Ell $ final nates，$ \ ell $是MUON。预选后，进行多元分析以拒绝背景。重建重中微子质量的策略是开发出来的，并提出了重建质量的分布。对参数的敏感性$ | v_ {τn} |^2 | v_ {en} |^2 /（| v_ {_v_ {τn} |^2 + | v_ {en} |^2）$在10到3000 GEV之间的沉重中性质量。在2- $σ$的意义上，最佳发现敏感性为$ \ sim 1.2 \ times10^{ - 5} \，\，（5.0 \ times 10^{ - 6}）$在$ m_n \ sim sim 100 $ gev for hadronic $τ_h$最终状态时，$ m_n \ sim 100 $ gev时。发现Leptonic $τ_\ ell $最终状态的敏感性与所研究大多数参数空间的Hadroonic $τ_H$最终状态相似。我们还得出了从Electroweak Precision Data（EWPD）和Delphi实验中混合参数的限制。假设$ | v_ {τn} |^2 = | v_ {en} |^2 = | v _ {\ ell n} |^2 $，从LHEC和FCC-EH实验中的敏感性界限比$ M_N \ mysim 900 $ gry $ grim ny $ gls y时，发现lhec和fcc-eh实验的范围更强。 GEV。在$ | v_ {τn} |^2 $ vs. $ | v_ {e n} |^2 $ plane中也解释和比较约束。
We utilize the lepton number violation signal process $p\, e^- \to τ^+ jjj$ to search for heavy Majorana neutrinos at future proton-electron colliders. The LHeC (FCC-eh) is considered to run with an electron beam energy of 60 GeV, a proton beam energy of 7 (50) TeV and an integrated luminosity of 1 (3) ab$^{-1}$, and the electron beam is considered to be unpolarized. We apply detector configurations and simulate signal and related standard model background events for both hadronic $τ_h$ and leptonic $τ_\ell$ final states, $\ell$ being a muon. After preselection, multivariate analyses are performed to reject the background. The strategy to reconstruct the heavy neutrino mass is developed and distributions of reconstructed mass are presented. Discovery sensitivities on parameter $|V_{τN}|^2 |V_{eN}|^2 / ( |V_{τN}|^2 + |V_{eN}|^2 )$ for the heavy neutrino mass between 10 and 3000 GeV are predicted. At the 2-$σ$ significance, the best discovery sensitivity is $\sim 1.2 \times10^{-5} \,\,(5.0 \times 10^{-6})$ at the LHeC (FCC-eh) when $m_N \sim 100$ GeV for the hadronic $τ_h$ final state. Sensitivities for the leptonic $τ_\ell$ final state are found to be similar to those for the hadronic $τ_h$ final state for most of the parameter space investigated. We also derive the limits on mixing parameters from electroweak precision data (EWPD) and DELPHI experiment. Assuming $|V_{τN}|^2 = |V_{eN}|^2 = |V_{\ell N}|^2$, sensitivity bounds from the LHeC and FCC-eh experiments are found to be stronger than those from EWPD when $m_N \lesssim 900$ GeV, and also stronger than those from DELPHI when $m_N \gtrsim 70$ GeV. Constraints are also interpreted and compared in the $|V_{τN}|^2$ vs. $|V_{e N}|^2$ plane.
