Probing the relaxed relaxion and Higgs-portal with S1 & S2

Abstract

We study the recent \XeT excess in context of solar scalar, specifically in the framework of Higgs-portal and the relaxion model. We show that $m_ϕ= 1.9\,\keV$ and $g_{\varphi e}=2.4\times 10^{-14}$ can explain the observed excess in science run 1 (SR1) analysis in the 1-7 keV range. When translated into the scalar-Higgs mixing angle, the corresponding mixing angle $\sin \theta =10^{-8}$ is intriguingly close to the maximum value of mixing angle for the technical naturalness of the scalar mass. Unlike the solar axion model, the excess favors a massive scalar field because of its softer spectrum. In the minimal scenarios we consider, the best fit parameters are in tension with stellar cooling bounds. We discuss a possibility that a large density of red giant stars may trigger a phase transition, resulting in a local scalar mass increase suppressing the stellar cooling. For the particular case of minimal relaxion scenarios, we find that such type of chameleon effects is automatically present but they can not ease the cooling bounds. They are however capable of triggering a catastrophic phase transition in the entire universe. Following this observation we derive a new set of bounds on the relaxed-relaxion parameter space.

8 pages, 5 figures; new bounds on relaxion parameter space are added

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• An Active-to-Sterile Neutrino Transition Dipole Moment and the XENON1T Excess
• Solar Neutrino Scattering with Electron into Massive Sterile Neutrino
• XENON1T solar axion and the Higgs boson emerging from the dark
• Runaway Relaxion from Finite Density
• XENON1T Excess: Some Possible Backgrounds
• Leading bounds on micro- to picometer fifth forces from neutron star cooling
• Screening the Higgs portal
• Prospects of nuclear-coupled-dark-matter detection via correlation spectroscopy of I${}_2^{+}$ and Ca${}^{+}$
• Terrestrial Probes of Electromagnetically Interacting Dark Radiation
• PASSAT at Future Neutrino Experiments: Hybrid Beam-Dump-Helioscope Facilities to Probe Light Axion-Like Particles
• A solar origin of the XENON1T excess without stellar cooling problems
• The Stochastic Relaxion
• Explorations of pseudo-Dirac dark matter having keV splittings and interacting via transition electric and magnetic dipole moments
• Explaining The XENON1T Excess With Light Goldstini Dark Matter
• Constraining CP violating nucleon-nucleon long range interactions in diatomic eEDM searches
• Dark Fluxes from Accreting Black Holes and Direct Detections
• Probing new hadronic forces with heavy exotic atoms
• A strong broadband 21 cm cosmological signal from dark matter spin-flip interactions
• Hierarchies from Landscape Probability Gradients and Critical Boundaries
• Stacking the Deck: Gambling on a Light QCD Axion
• Lorentz violating backgrounds from quadratic, shift-symmetric, ultralight dark matter