Heavy neutral leptons at the Electron-Ion Collider
Heavy neutral leptons at the Electron-Ion Collider
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DOI：
10.1007/jhep03(2023)020
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发表时间：
2022-10
影响因子：
5.4
通讯作者：
B. Batell;T. Ghosh;T. Han;K. Xie
中科院分区：
文献类型：
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作者：
B. Batell;T. Ghosh;T. Han;K. Xie
布鲁克海文国家实验室未来的电子-离子对撞机(EIC)及其阐明核结构的主要能力，将为探索与电弱部门耦合的标准模型以外的物理提供新的机会。这种新物理学最有动力的例子之一是新的重中性轻子(HNL)，它们可能在中微子质量产生和轻子数破坏中发挥关键作用。我们研究了EIC搜索HNLS的能力，HNL可以通过带电电流相互作用在电子-质子碰撞中产生，这是它们与轻中微子混合的结果。我们发现，在EIC设计的能量和积分光度下，可以通过瞬发衰变信号探测质量范围为1-100GeV的HNL，混合角可以精确到10−4−10−3量级，通过位移衰变信号可以探测质量范围为1 10GeV的|Ue|2~10−6-10−4。我们还考虑了不可见模式，其中HNL未被检测到或衰变为暗扇区粒子。如果SM背景系统能够得到控制，人们可能会探测到窗口10−3-10−2中混合角度的重HNL。这些搜索是对HNL的其他探测器的补充，例如无中微子双β衰变、介子衰变、固定目标和高能对撞机实验。
The future Electron-Ion Collider (EIC) at Brookhaven National Laboratory, along with its primary capacity to elucidate the nuclear structure, will offer new opportunities to probe physics beyond the Standard Model coupled to the electroweak sector. Among the best motivated examples of such new physics are new heavy neutral leptons (HNLs), which are likely to play a key role in neutrino mass generation and lepton number violation. We study the capability of the EIC to search for HNLs, which can be produced in electron-proton collisions through charged current interactions as a consequence of their mixing with light neutrinos. We find that, with the EIC design energy and integrated luminosity, one is able to probe HNLs in the mass range of 1–100 GeV with mixing angles down to the order of 10− 4− 10− 3 through the prompt decay signatures, and in the mass range of 1 10 GeV with| U e| 2~ 10− 6–10− 4 via the displaced decay signatures. We also consider the invisible mode where an HNL is undetected or decaying to dark sector particles. One could potentially probe heavy HNLs for mixing angles in the window 10− 3–10− 2, provided SM background systematics can be brought under control. These searches are complementary to other probes of HNLs, such as neutrino-less double-β decay, meson decay, fixed-target, and high-energy collider experiments.