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arXiv 2202.06703hep-phhep-ex
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未来线性e $^+$ e $^-$对撞机上的重中微子

Heavy neutrinos at future linear e$^+$e$^-$ colliders

Krzysztof Mękała, Jürgen Reuter, Aleksander Filip Żarnecki

摘要:

中微子是自然界中最神秘的粒子之一。它们的质量层次和振荡,以及它们的反粒子性质,正在世界各地的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,宇宙中的重子不对称性或暗物质密度都是通过引入新的中微子来解释的。其中,狄拉克或马约拉纳性质的重中微子被提出来解决高能物理中的未决问题。这种质量超过EW尺度的中微子可以在未来的线性e $^+$ e $^-$对撞机上产生,比如紧凑型直线对撞机(CLIC)或国际直线对撞机(ILC)。研究了在500 GeV和1 TeV的ILC和3 TeV的CLIC条件下观测到重Dirac和Majorana中微子在$qq\ell$末态衰变的可能性。分析是基于Whizard事件生成和快速模拟的检测器响应与Delphes。中微子的质量从200 GeV到3.2 TeV。我们估计了产生截面的极限,用中微子-轻子耦合参数$V_{\ell N}^{2}$(实际上是中微子混合角)解释了它们,并将它们与目前运行在13 TeV的LHC的极限以及未来强子对撞机的预期极限进行了比较。未来轻子对撞机的极限,延伸到$10^{-7} - 10^{-6}$的耦合值,比迄今为止发表的任何其他极限估计都要严格。

英文摘要:

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.

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