论文标题
重型中微子在未来线性E $^+$ e $^ - $ colliders
Heavy neutrinos at future linear e$^+$e$^-$ colliders
论文作者
论文摘要
中微子是自然界中最神秘的颗粒之一。他们的质量层次结构和振荡及其反粒子性质正在全球实验中进行深入研究。此外，在标准模型之外的许多物理模型中，通过引入新的中微子物种来解释宇宙中的重子不对称或宇宙中的暗物质密度。除其他外，提议在高能量物理学中解决狄拉克或主要性质的大中微子。这种具有高于EW量表的中微子可以在未来的线性E $^+$ e $^ - $ colliders中产生，例如紧凑型线性撞机（CLIC）或国际线性碰撞器（ILC）。 我们研究了在$ qq \ ell $最终状态下观察重型狄拉克和major虫中微子的可能性，而ILC在500 GEV和1 TEV上运行，而CLIC则在3 TEV。该分析基于Whizard事件的产生和使用Delphes的检测器响应的快速模拟。考虑了从200 GEV到3.2 TEV的中微子。我们估计了生产横截面的限制，用中微子 - 莱普顿耦合参数$ v _ {\ ell n}^{2} $（实际上是中微子混合角）来解释它们，并将它们与来自13 TEV的LHC产生的当前限制以及未来的Haver colliders的预期限制进行了比较。未来的Lepton Colliders的限制，延伸到$ 10^{ - 7} -10^{ - 6} $的耦合值比迄今为止发布的任何其他限制估计值都要严格。
Neutrinos are among the most mysterious particles in nature. Their mass hierarchy and oscillations, as well as their antiparticle properties, are being intensively studied in experiments around the world. Moreover, in many models of physics beyond the Standard Model, the baryon asymmetry or the dark matter density in the Universe are explained by introducing new species of neutrinos. Among others, heavy neutrinos of Dirac or Majorana nature were proposed to solve open questions in High Energy Physics. Such neutrinos with masses above the EW scale could be produced at future linear e$^+$e$^-$ colliders, like the Compact LInear Collider (CLIC) or the International Linear Collider (ILC). We studied the possibility of observing decays of heavy Dirac and Majorana neutrinos in the $qq\ell$ final state with ILC running at 500 GeV and 1 TeV, and CLIC at 3 TeV. The analysis is based on the Whizard event generation and fast simulation of detector response with Delphes. Neutrinos with masses from 200 GeV to 3.2 TeV were considered. We estimated the limits on the production cross sections, interpreted them in terms of the neutrino-lepton coupling parameter $V_{\ell N}^{2}$ (effectively the neutrino mixing angle) and compared them with current limits coming from the LHC running at 13 TeV, as well as the expected limits from future hadron colliders. The limits for the future lepton colliders, extending down to the coupling values of $10^{-7} - 10^{-6}$, are stricter than any other limit estimates published so far.
