大型强子对撞机重中微子搜索对不可知νSMEFT的直接约束
Direct constraints on the agnostic $ν$SMEFT from heavy-neutrino searches at the LHC
AI总结：
基于CMS同号双μ子加双喷注末态重中微子搜索实验，通过详细重塑实验分析，给出200 GeV至15 TeV范围内重中微子质量对应的有效耦合强度观测上限，首次获得不可知νSMEFT参数空间的实验排除极限。
AI中文摘要：
中微子振荡和质量的观测推动了包含右手型中微子的标准模型扩展。若存在超出当前实验直接探测范围的新物理，其效应可在中微子标准模型有效场论（νSMEFT）中系统描述。在此框架下，重中性轻子是对撞机搜索的一个有前景目标。本文重新解读CMS在同号双μ子加双喷注末态对重马约拉纳中微子的搜索，以约束六维νSMEFT的参数空间。通过详细重塑实验分析，给出了纯不可知基准和包含无中微子双β衰变约束基准的结果。对于200 GeV至15 TeV范围内的重中微子质量，有效耦合强度的观测上限为5.8×10⁻⁷ GeV⁻²至2.3×10⁻⁶ GeV⁻²。这些结果构成了从大型强子对撞机重中微子搜索的专门重塑中获得的对不可知νSMEFT参数空间的首个实验排除极限。
英文摘要：
The observation of neutrino oscillations and masses motivates extensions of the Standard Model containing right-handed neutrinos. If additional new physics exists at scales beyond the direct reach of present experiments, its effects can be systematically described within the neutrino Standard Model Effective Field Theory ($ν$SMEFT). In this framework, heavy neutral leptons provide a promising target for collider searches. In this work, we reinterpret a CMS search for heavy Majorana neutrinos in the same-sign dimuon plus two jets final state to constrain the parameter space of the dimension-six $ν$SMEFT. Using a detailed recast of the experimental analysis, we present results for both a pure-agnostic benchmark and a benchmark incorporating neutrinoless double-beta-decay bounds. For heavy-neutrino masses in the range $200~\mathrm{GeV} \le m_N \le 15~\mathrm{TeV}$, the observed upper limits on the effective coupling strength range from $5.8\times10^{-7}\,\mathrm{GeV}^{-2}$ to $2.3\times10^{-6}\,\mathrm{GeV}^{-2}$. These results constitute the first experimental exclusion limits on the agnostic $ν$SMEFT parameter space obtained from a dedicated recast of an LHC heavy-neutrino search.
