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arXiv 2209.07565hep-ph
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在未来轻子对撞机上通过SM-like和暗Higgs玻色子的不可见衰变探测轻暗扇区

Probing a light dark sector at future lepton colliders via invisible decays of the SM-like and dark Higgs bosons

Gholamhossein Haghighat, Mojtaba Mohammadi Najafabadi, Kodai Sakurai, Wen Yin

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44 pages, 10 figures
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AI总结：

本文首次同时考虑SM-like和暗Higgs玻色子的不可见衰变，利用多变量技术，在ILC 250 GeV对撞机上探测轻暗扇区，发现即使SM-like Higgs不可见衰变远低于计划灵敏度，暗Higgs衰变仍可提供确凿信号。

摘要：

一个可重整化的轴子类似粒子（ALPs）或隐藏光子的紫外（UV）模型，通常涉及一个在标准模型（SM）规范群下为单态的暗Higgs场，该模型可能解释暗物质。暗扇区可以通过SM-like Higgs与暗Higgs场之间的门户耦合与SM粒子耦合。通过这种耦合，暗扇区粒子可以在早期宇宙或对撞机实验中产生。有趣的是，不仅SM-like Higgs玻色子可以衰变为轻暗玻色子，而且一个轻暗Higgs玻色子也可能在对撞机中产生并衰变为暗玻色子。在本文中，我们首次同时考虑两种Higgs玻色子，进行不可见衰变的对撞机搜索。我们使用多变量技术来最佳地区分信号与背景。我们发现，在质心能量为250 GeV的国际直线对撞机（ILC）上，可以探测到大的参数区域。特别是，即使SM-like Higgs不可见衰变比ILC和高亮度LHC（HL-LHC）的计划灵敏度低几个数量级，该情景也可以通过类似图产生的暗Higgs玻色子的不可见衰变来探测。测量暗Higgs玻色子衰变到暗扇区将是轻暗扇区的确凿信号。类似的暗扇区搜索预期将在例如Cool Copper Collider（C$^3$）、环形正负电子对撞机（CEPC）、紧凑型直线对撞机（CLIC）和未来环形正负电子对撞机（FCC-ee）中进行。

英文摘要：

A renormalizable UV model for Axion-Like Particles (ALPs) or hidden photons, that may explain the dark matter usually involves a dark Higgs field which is a singlet under the standard model (SM) gauge group. The dark sector can couple to the SM particles via the portal coupling between the SM-like Higgs and dark Higgs fields. Through this coupling, the dark sector particles can be produced in either the early universe or the collider experiments. Interestingly, not only the SM-like Higgs boson can decay into the light dark bosons, but also a light dark Higgs boson may be produced and decay into the dark bosons in a collider. In this paper, we perform the first collider search for invisible decays by taking both the Higgs bosons into account. We use a multivariate technique to best discriminate the signal from the background. We find that a large parameter region can be {probed} at the International Linear Collider (ILC) operating at the center-of-mass energy of 250 GeV. In particular, even when the SM-like Higgs invisible decay is a few orders of magnitude below the planned sensitivity reaches of the ILC and the high luminosity LHC (HL-LHC), the scenario can be probed by the invisible decay of the dark Higgs boson produced via a similar diagram. Measuring the dark Higgs boson decay into the dark sector will be a smoking gun signal of the light dark sector. A similar search of the dark sector would be expected in, e.g., Cool Copper Collider (C$^3$), Circular Electron Positron Collider (CEPC), Compact Linear Collider (CLIC) and {Future Circular electron-positron Collider (FCC-ee).

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