论文标题
伪金石无菌中微子的流离失所的顶点签名
Displaced Vertex signatures of a pseudo-Goldstone sterile neutrino
论文作者
论文摘要
中微子质量产生的低尺度模型通常具有无菌中微子，其中质量在GEV-TEV范围内，可以通过与标准模型中微子的混合在山脉中产生。我们考虑了一种替代方案，其中无菌中微子是在较重粒子的衰减中产生的，因此其生产横截面不取决于活动性肌中中微子混合角。如果它们导致可观察到的流离失所的顶点，则可以通过无菌中微子的衰减来访问混合角。我们介绍了这种情况的明确实现，其中无菌中微子是伪 - nambu-goldstone-boson的超对称伴侣，并且是在希格斯诺（Higgsino）样的中和charginos的衰落中产生的。该模型可以根据少数参数来预测活动性 - 肌中中微子混合角度。我们表明，一个质量在几个GEV和200 GEV之间的无菌中微子可以导致LHC的可观察到的位移顶点，并概述了通过实验重建其混合角度的策略。
Low-scale models of neutrino mass generation often feature sterile neutrinos with masses in the GeV-TeV range, which can be produced at colliders through their mixing with the Standard Model neutrinos. We consider an alternative scenario in which the sterile neutrino is produced in the decay of a heavier particle, such that its production cross section does not depend on the active-sterile neutrino mixing angles. The mixing angles can be accessed through the decays of the sterile neutrino, provided that they lead to observable displaced vertices. We present an explicit realization of this scenario in which the sterile neutrino is the supersymmetric partner of a pseudo-Nambu-Goldstone boson, and is produced in the decays of higgsino-like neutralinos and charginos. The model predicts the active-sterile neutrino mixing angles in terms of a small number of parameters. We show that a sterile neutrino with a mass between a few 10 GeV and 200 GeV can lead to observable displaced vertices at the LHC, and outline a strategy for reconstructing experimentally its mixing angles.
