Effective Aligned 2HDM with a DFSZ-like invisible axion

在包含轴子类粒子的模型中 $B\rightarrow K + invisible$ 的研究

$B\rightarrow K + invisible$ in a model with axion-like particles

该研究在包含轴子类粒子的模型中，探讨了$B\rightarrow K + invisible$现象，发现双环图贡献主导单环图，并指出轻有效理论中出现的非退耦特征，表明传统相互作用描述不完整。

去除 KSVZ 和 DFSZ 模型中轴子标度的宇宙学界限

Removing the Cosmological Bound on the Axion Scale in the KSVZ and DFSZ Models

本文在KSVZ和DFSZ模型中通过暴胀期间修改跑动耦合实现早期强QCD，避免轴子标度的宇宙学界限，并确定轴子构成全部暗物质的参数空间。

Phenomenology of the Inert (2+1) and (4+2) Higgs Doublet Models

We make a phenomenological study of a model with two inert doublets plus one Higgs doublet (I(2+1)HDM) which is symmetric under a Z$_2$ group, preserved after Electro-Weak Symmetry Breaking (EWSB) by the vacuum alignment $(0,0,v)$. This model may be regarded as an extension to the model with one inert doublet plus one Higgs doublet (I(1+1)HDM), by the addition of an extra inert scalar doublet. The neutral fields from the two inert doublets provide a viable Dark Matter (DM) candidate which is stabilised by the conserved $Z_2$ symmetry. We study the new Higgs decay channels offered by the scalar…

Prospects for axion detection in natural SUSY with mixed axion-higgsino dark matter: back to invisible?

Under the expectation that nature is natural, we extend the Standard Model to include SUSY to stabilize the electroweak sector and PQ symmetry to stabilize the QCD sector. Then natural SUSY arises from a Kim-Nilles solution to the SUSY mu problem which allows for a little hierarchy where mu ~ f_a^2/M_P ~ 100-300 GeV while the SUSY particle mass scale m(SUSY)~ 1-10 TeV >> mu. Dark matter then consists of two particles: a higgsino-like WIMP and a SUSY DFSZ axion. The range of allowed axion mass values m(axion) depends on the mixed axion-higgsino relic density. The range of m(axion) is actually r…

$B\rightarrow K + \text{axion-like particles}$：有效模型与UV完备模型及增强的双圈贡献

$B\rightarrow K + \text{axion-like particles}$: effective versus UV-complete models and enhanced two-loop contributions

本研究重新审视DFSZ模型中B→K a跃迁率，发现基于混合角的简化方法仅单圈有效，双圈贡献未被抑制且在tanβ≥5时重要，并澄清了低能有效理论的歧义。

An ultra-weak sector, the strong CP problem and the pseudo-Goldstone dilaton

In the context of a Coleman-Weinberg mechanism for the Higgs boson mass, we address the strong CP problem. We show that a DFSZ-like invisible axion model with a gauge-singlet complex scalar field S, whose couplings to the Standard Model are naturally ultra-weak, can solve the strong CP problem and simultaneously generate acceptable electroweak symmetry breaking. The ultra-weak couplings of the singlet S are associated with underlying approximate shift symmetries that act as custodial symmetries and maintain technical naturalness. The model also contains a very light pseudo-Goldstone dilaton th…