论文标题
在电子普罗顿山区搜索重的主要中微子
Search for heavy Majorana neutrinos at electron-proton colliders
论文作者
论文摘要
我们通过Lepton数字违反信号过程$ p \，e^ - \至μ^+ JJJ $在未来的电子普罗顿校友处制定了重型主要中微子的搜索策略。信号和主导的标准模型背景事件是通过快速检测器模拟生成的。我们应用预选前标准，并基于机器学习来执行多变量分析以拒绝背景。通过在执行多变量分析时输入两套不同的可观察结果，可以比较有关信号和背景过程的代表性运动可观察物的分布。混合参数$ | v _ {\ ell n} |^2 $的2-和5- $σ$限制在10 $ - $ 1000 GEV的范围内预测为重中微子质量$ m_n $。在LHEC（FCC-EH）上，电子束能量为60 GEV，质子束能量为7（50）TEV和1（3）AB $^{ - 1} $的集成光度，混合参数$ | v _ {\ ell n} | $ \ MATHCAL {O}（100）$ GEV在2- $σ$级别。限制要比LHC的当前实验限制强得多，以$ m_n $ 30 GEV的限制。还检查并评论了正电子信号的最终状态和长期沉重中微子病例的影响。
We develop the search strategy for a heavy Majorana neutrino via the lepton number violation signal process $p\, e^- \to μ^+ jjj$ at future electron-proton colliders. The signal and dominant standard model background events are generated with the fast detector simulation. We apply the pre-selection criteria and perform the multi-variate analysis based on machine-learning to reject the background. Distributions of representative kinematic observables are presented for both signal and background processes and effects on final limits are compared by inputting two different set of observables when performing multi-variate analysis. The 2- and 5-$σ$ limits on the mixing parameter $|V_{\ell N}|^2$ are predicted for the heavy neutrino mass $m_N$ in the range of 10$-$1000 GeV. At the LHeC (FCC-eh) with an electron beam energy of 60 GeV, a proton beam energy of 7 (50) TeV and an integrated luminosity of 1 (3) ab$^{-1}$, the mixing parameter $|V_{\ell N}|^2$ can be constrained to be below $\sim 3.0~(1.0) \times 10^{-6}$ for $m_N$ around $\mathcal{O}(100)$ GeV at 2-$σ$ level. The limits are much stronger than the current experiment limits at the LHC for $m_N$ above 30 GeV. The positron signal final state and the effect of long-lived cases of heavy neutrinos are also checked and commented.
