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arXiv 2207.08142hep-ph
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S.M.A.S.H.E.D.：Dirac中微子的标准模型推广的轴子Seesaw Higgs暴胀

S.M.A.S.H.E.D.: Standard Model Axion Seesaw Higgs Inflation Extended for Dirac Neutrinos

Maximilian Berbig

备注：
Comments are always welcome! v2: Clarifications added, plots and references updated, conclusions unchanged, typos corrected, matches published version
发表信息：
JCAP11(2022)042
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摘要：

灵感来自S.M.A.S.H.框架，我们构建了一个模型，解决了强CP问题，轴子暗物质，通货膨胀和狄拉克中微子质量以及leptogenesis。该模型只有两个动力学尺度，即SM破缺尺度$v_H$和Peccei-Quinn（PQ）破缺尺度$v_σ$。我们在通常的KSVZ方式中引入重矢量类夸克来实现强CP问题的PQ机制。为了产生中微子质量，通过一个六维算符标度为$m_ν\sim v_H^3 / v_σ^2$，我们添加了重三重态和二重态轻子，它们在SM下是矢量样的，但在PQ对称下是手征的。该模型是免费的宇宙畴壁问题，并预测轴子光子耦合，这是约一个数量级大于传统的DFSZ和KSVZ模型。因此，我们的情况下，可以探测和可能排除当前和下一代轴子实验，如ORGAN或MADMAX。此外，我们数值证明，我们的建设可以产生所观察到的重子不对称性，通过实现一个版本的狄拉克-轻子生成的情况。作为我们的中微子质量机制的结果，我们发现，在三重态费米子衰变的不对称性也可以显着增强高达6个数量级相比，典型的跷跷板的情况下，不需要调用共振增强。顺便说一下，我们注意到，一个具有多种衰变模式的衰变狄拉克费米子包含了以前在衰变标量三重态中遇到的\enquote{quasi optimal efficiency} -场景所需的所有必要成分。右手中微子和轴子对$ΔN_\text{eff}$的影响进行了估计，并在目前的范围内。

英文摘要：

Inspired by the S.M.A.S.H. framework we construct a model that addresses the strong CP problem, axion dark matter, inflation and Dirac neutrino masses as well as leptogenesis. The model possesses only two dynamical scales, namely the SM breaking scale $v_H$ and the Peccei Quinn (PQ) breaking scale $v_σ$. We introduce heavy vector-like quarks in the usual KSVZ fashion to implement the PQ mechanism for the strong CP problem. To generate neutrino masses via a dimension six operator scaling as $m_ν\sim v_H^3 / v_σ^2$ we add heavy triplet and doublet leptons, which are vector-like under the SM but chiral under PQ symmetry. The model is free from the cosmological domain wall problem and predicts an axion to photon coupling which is about an order of magnitude larger than in conventional DFSZ and KSVZ models. Thus our scenario can be probed and potentially excluded by current and next generation axion experiments such as ORGAN or MADMAX. In addition we numerically demonstrate that our construction can generate the observed baryon asymmetry by realizing a version of the Dirac-Leptogenesis scenario. As a consequence of our neutrino mass mechanism we find that the asymmetry in triplet fermion decays can also be significantly enhanced by up to six orders of magnitude when compared to typical Seesaw scenarios without needing to invoke a resonant enhancement. In passing we note that a decaying Dirac fermion with multiple decay modes contains all the necessary ingredients required for the \enquote{quasi optimal efficiency}-scenario previously encountered in the context decaying scalar triplets. The impact of the right handed neutrinos and the axion on $ΔN_\text{eff}$ is estimated and lies within current bounds.

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