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.

arXiv comment8 pages, 5 figures; new bounds on relaxion parameter space are added

References in corpus (69)

• Asymptotic formulae for likelihood-based tests of new physics
• Cosmological Relaxation of the Electroweak Scale
• Light Dark Matter Search with Ionization Signals in XENON1T
• Excess Electronic Recoil Events in XENON1T
• A new Generation of Standard Solar Models
• Bosonic super-WIMPs as keV-scale dark matter
• Stellar cooling bounds on new light particles: plasma mixing effects
• Dark Matter Direct Detection with Accelerometers
• Neutrino and axion bounds from the globular cluster M5 (NGC 5904)
• Neutrino Oscillations as a Probe of Dark Energy
• Stellar Recipes for Axion Hunters
• Neutron scattering and extra short range interactions
• Is there a supernova bound on axions?
• Solar axion flux from the axion-electron coupling
• Sound of Dark Matter: Searching for Light Scalars with Resonant-Mass Detectors
• Probing axions with neutron star inspirals and other stellar processes
• Limits on a CP-violating scalar axion-nucleon interaction
• First Searches for Axions and Axion-Like Particles with the LUX Experiment
• Phenomenology of relaxion-Higgs mixing
• Relaxation from particle production
• New limits on dark photons from solar emission and keV scale dark matter
• Search for a standard model-like Higgs boson in the mu+ mu- and e+ e- decay channels at the LHC
• Sub-eV scalar dark matter through the super-renormalizable Higgs portal
• Constraining New Physics Models with Isotope Shift Spectroscopy
• XENON1T excess from anomaly-free ALP dark matter and its implications for stellar cooling anomaly
• Boosted Dark Matter Interpretation of the XENON1T Excess
• Experimental constraints on the coupling of the Higgs boson to electrons
• Solar axions cannot explain the XENON1T excess
• Dark Matter and the XENON1T electron recoil excess
• Exploring the robustness of stellar cooling constraints on light particles
• Atmospheric Dark Matter and Xenon1T Excess
• Explaining the XENON1T excess with Luminous Dark Matter
• Inelastic Dark Matter Electron Scattering and the XENON1T Excess
• Axion Fragmentation
• Exploring for sub-MeV Boosted Dark Matter from Xenon Electron Direct Detection
• Constraints on new interactions from neutron scattering experiments
• Leptonic New Force and Cosmic-ray Boosted Dark Matter for the XENON1T Excess
• Light new physics in XENON1T
• Neutrino self-interactions and XENON1T electron recoil excess
• Solar neutrino probes of the muon anomalous magnetic moment in the gauged $U(1{)}_{L_{\mu }-L_{\tau }}$
• Light vector mediators facing XENON1T data
• Probing the Relaxed Relaxion at the Luminosity and Precision Frontiers
• Dynamics of Relaxed Inflation
• Scalar Direct Detection: In-Medium Effects
• Can Nonstandard Neutrino Interactions explain the XENON1T spectral excess?
• XENON1T Anomaly and its Implication for Decaying Warm Dark Matter
• Constraints on Relaxion Windows
• Dynamics of the cosmological relaxation after reheating
• The QCD Axion at Finite Density
• Prospects of Migdal Effect in the Explanation of XENON1T Electron Recoil Excess
• Hidden Photon Dark Matter in the Light of XENON1T and Stellar Cooling
• Gravitational Production of Hidden Photon Dark Matter in Light of the XENON1T Excess
• Constraining Neutrino Cooling using the Hot White Dwarf Luminosity Function in the Globular Cluster 47 Tucanae
• Shining dark matter in Xenon1T
• Relaxion Fluctuations (Self-stopping Relaxion) and Overview of Relaxion Stopping Mechanisms
• On-shell mediator dark matter models and the Xenon1T anomaly
• Exothermic Dark Matter for XENON1T Excess
• Failure of a neutrino-driven explosion after core-collapse may lead to a thermonuclear supernova
• Collider Constraints on a Dark Matter Interpretation of the XENON1T Excess
• Sun Heated MeV-scale Dark Matter and the XENON1T Electron Recoil Excess
• XENON1T observes tritium
• Galactic Origin of Relativistic Bosons and XENON1T Excess
• Large Higgs-electron Yukawa coupling in 2HDM
• Searching for a solar relaxion/scalar with XENON1T and LUX
• Energy resolution and linearity of XENON1T in the MeV energy range
• Fast-Rolling Relaxion
• Consequences of Fine-Tuning for Fifth Force Searches
• Searches for other vacua I: bubbles in our universe
• Cosmological Relaxation from Dark Fermion Production

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• XENON1T solar axion and the Higgs boson emerging from the dark
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• Leading bounds on micro- to picometer fifth forces from neutron star cooling
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• Prospects of nuclear-coupled-dark-matter detection via correlation spectroscopy of I${}_2^{+}$ and Ca${}^{+}$
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