Effective Theory of Flavor for Minimal Mirror Twin Higgs

Abstract

We consider two copies of the Standard Model, interchanged by an exact parity symmetry, P. The observed fermion mass hierarchy is described by suppression factors ${\epsilon }^{n_i}$ for charged fermion $i$, as can arise in Froggatt-Nielsen and extra-dimensional theories of flavor. The corresponding flavor factors in the mirror sector are ${\epsilon }^{\prime n_i}$, so that spontaneous breaking of the parity P arises from a single parameter ${\epsilon }^{\prime }/\epsilon$, yielding a tightly constrained version of Minimal Mirror Twin Higgs, introduced in our previous paper. Models are studied for simple values of $n_i$, including in particular one with SU(5)-compatibility, that describe the observed fermion mass hierarchy. The entire mirror quark and charged lepton spectrum is broadly predicted in terms of ${\epsilon }^{\prime }/\epsilon$, as are the mirror QCD scale and the decoupling temperature between the two sectors. Helium-, hydrogen- and neutron-like mirror dark matter candidates are constrained by self-scattering and relic ionization. In each case, the allowed parameter space can be fully probed by proposed direct detection experiments. Correlated predictions are made as well for the Higgs signal strength and the amount of dark radiation.

43 pages, 15 figures

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• Mirror Twin Higgs Cosmology: Constraints and a Possible Resolution to the $H_0$ and $S_8$ Tensions
• Composite Twin Dark Matter
• Direct Detection of Mirror Matter in Twin Higgs Models
• Collider Searches for Dark Matter through the Higgs Lens
• Direct Detection of Atomic Dark Matter in White Dwarfs
• Twin Higgs Portal Dark Matter
• A Minimal Model for Neutral Naturalness and pseudo-Nambu-Goldstone Dark Matter
• Cosmology of the Twin Higgs without explicit ${\mathbb{Z}}_2$ breaking
• Baryogenesis through Asymmetric Reheating in the Mirror Twin Higgs
• First-order phase transitions in Twin Higgs models
• Twin Cogenesis
• Twin Quark Dark Matter From Cogenesis
• Charged Dark Matter in Supersymmetric Twin Higgs models
• Breaking Mirror Twin Color
• $Z_2$-Odd Polonyi Field in Twin Higgs Model
• Review of Neutral Naturalness