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arXiv 2007.04367hep-phhep-th
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来自强相互作用暗区的重暗物质、中微子质量和希格斯粒子的自然性

Heavy Dark Matter, Neutrino Masses and Higgs Naturalness from a Strongly Interacting Hidden Sector

Mayumi Aoki, Vedran Brdar, Jisuke Kubo

备注：
22 pages, 11 figures, published in PRD
发表信息：
Phys. Rev. D 102, 035026 (2020)
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摘要：

考虑了标准模型的扩展，其中包含强相互作用的类QCD隐扇区、至少两代右手中微子和一个标量单重态。当标量单态达到非零真空期望值时，通过I型跷跷板机制产生活动中微子质量。同时，电弱标度是通过涉及这些大质量费米子的辐射修正产生的。这就是被称为“中微子选择”的情况的本质，在这种情况下，右手中微子的成功质量在$10^7-10^8$ GeV范围内。这项工作的主要目标是仔细检查在这样的实现中容纳暗物质的潜力。暗物质的候选者是南武-戈德斯通玻色子，它是由于隐藏的手征对称性的动力学破缺而出现的。在这项工作中研究的质谱是这样的南武-戈德斯通玻色子和单重标量的质量超过右手中微子。由于所有相关粒子的质量都比$\mathcal{O}$（TeV）高出几个数量级，暗物质的冻结是无法实现的，因此我们转向替代方案，即冻结。南武-戈德斯通玻色子可以与不在SM中的粒子相互作用，但是，通过它们与SM的不太小的耦合，它们具有不可忽略的丰度。利用这一点，我们证明了模型中的暗物质是在右手中微子仍然稳定的温度范围内成功产生的。我们注意到，轻子数不对称性足以产生可观测的重子不对称性的宇宙可以产生右手中微子衰变。因此，我们推断该模型有可能同时解决当代高能物理中几个最相关的难题。

英文摘要：

We consider the extension of the Standard Model (SM) with a strongly interacting QCD-like hidden sector, at least two generations of right-handed neutrinos and one scalar singlet. Once scalar singlet obtains a nonzero vacuum expectation value, active neutrino masses are generated through type-I seesaw mechanism. Simultaneously, the electroweak scale is generated through the radiative corrections involving these massive fermions. This is the essence of the scenario that is known as the "neutrino option" for which the successful masses of right-handed neutrinos are in the range $10^7-10^8$ GeV. The main goal of this work is to scrutinize the potential to accommodate dark matter in such a realization. The dark matter candidates are Nambu-Goldstone bosons which appear due to the dynamical breaking of the hidden chiral symmetry. The mass spectrum studied in this work is such that masses of Nambu-Goldstone bosons and singlet scalar exceed those of right-handed neutrinos. Having the masses of all relevant particles several orders of magnitude above $\mathcal{O}$(TeV), the freeze-out of dark matter is not achievable and hence we turn to alternative scenarios, namely freeze-in. The Nambu-Goldstone bosons can interact with particles that are not in SM but, however, have non-negligible abundance through their not-too-small couplings with SM. Utilizing this, we demonstrate that the dark matter in the model is successfully produced at temperature scale where the right-handed neutrinos are still stable. We note that the lepton number asymmetry sufficient for the generation of observable baryon asymmetry of the Universe can be produced in right-handed neutrino decays. Hence, we infer that the model has the potential to simultaneously address several of the most relevant puzzles in contemporary high-energy physics.

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