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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2001.04750hep-ph
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ANUBIS的重中性轻子

Heavy neutral leptons at ANUBIS

Martin Hirsch, Zeren Simon Wang

摘要:

最近,Bauer $\textit{et al.}$ arXiv:1909.13022提出了一种安装在ATLAS或CMS相互作用点上方的一个竖井中的辅助探测器ANUBIS,作为寻找长寿命粒子的工具。在这里,我们研究了这一建议的灵敏度长寿命的重中性轻子(HNL)在最小和扩展的情况。我们从最小的HNL模型,其中HNL的产生和衰变都是由活性-无菌中微子混合介导的,然后研究左右对称模型中右手中微子的情况。然后,我们考虑SM的$U(1)_{B-L}$扩展。在这个模型中,HNL是由大部分类似SM的希格斯玻色子玻色子的衰变产生的,通过在理论的标量部分混合。在所有情况下,我们发现,ANUBIS的灵敏度达到建议的MATHUSLA探测器。对于最小HNL情况,$W$的衰变对HNL的贡献在ANUBIS比在MATHUSLA更重要,从而将灵敏度扩展到ANUBIS的稍大HNL质量。

英文摘要:

Recently Bauer $\textit{et al.}$ arXiv:1909.13022 proposed ANUBIS, an auxiliary detector to be installed in one of the shafts above the ATLAS or CMS interaction point, as a tool to search for long-lived particles. Here, we study the sensitivity of this proposal for long-lived heavy neutral leptons (HNLs) in both minimal and extended scenarios. We start with the minimal HNL model where both production and decay of the HNLs are mediated by active-sterile neutrino mixing, before studying the case of right-handed neutrinos in a left-right symmetric model. We then consider a $U(1)_{B-L}$ extension of the SM. In this model HNLs are produced from the decays of the mostly SM-like Higgs boson, via mixing in the scalar sector of the theory. In all cases, we find that ANUBIS has sensitivity reach comparable to the proposed MATHUSLA detector. For the minimal HNL scenario, the contributions from $W$'s decaying to HNLs are more important at ANUBIS than at MATHUSLA, extending the sensitivity to slightly larger HNL masses at ANUBIS.

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