PandaX-4T reports the first direct spectral search for scalar-mediated neutrino self-interactions in 136Xe double beta decay, setting new upper limits for mediator masses below 2 MeV/c².
Non-Perturbative Effect on Dark Matter Annihilation and Gamma Ray Signature from Galactic Center
4 Pith papers cite this work. Polarity classification is still indexing.
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Pith papers citing it
abstract
Detection of gamma rays from dark matter annihilation in the galactic center is one of the feasible techniques to search for dark matter. We evaluate the gamma ray flux in the case that the dark matter has an electroweak SU(2)_L charge. Such dark matter is realized in the minimal supersymmetric standard model (MSSM) when the lightest SUSY particle is the Higgsino- or Wino-like neutralino. When the dark matter is heavy compared to the weak gauge bosons, the leading-order calculation of the annihilation cross sections in perturbation breaks down due to a threshold singularity. We take into account non-perturbative effects by using the non-relativistic effective theory for the two-body states of the dark matter and its SU(2)_L partner(s), and evaluate precise cross sections relevant to the gamma ray fluxes. We find that the annihilation cross sections may be enhanced by several orders of magnitude due to resonances when the dark matter mass is larger than 1 TeV. Furthermore, the annihilation cross sections in the MSSM may be changed by factors even when the mass is about 500 GeV. We also discuss sensitivities to gamma ray signals from the galactic center in the GLAST satellite detector and the large Air Cerenkov Telescope arrays.
representative citing papers
Different unitarization prescriptions for the Sommerfeld enhancement are equivalent to leading order and yield a regulator-independent formula for multi-state systems written only in terms of the standard enhancement factor, the hard annihilation amplitude, and the long-range S-matrix.
Electroweak SU(2)_L doublet fermion dark matter with mass above 10^10 GeV (or 300 GeV if pseudo-Dirac) is produced by Boltzmann-suppressed freeze-in above the reheat temperature and evades direct detection while never thermalizing.
Electroweak doublet dark matter with Higgs-portal interactions accounts for the Galactic halo gamma-ray excess via gauge boson annihilation and allows inelastic scattering with ~100 keV splitting.
citing papers explorer
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Probing scalar-neutrino and scalar-dark-matter interactions with PandaX-4T
PandaX-4T reports the first direct spectral search for scalar-mediated neutrino self-interactions in 136Xe double beta decay, setting new upper limits for mediator masses below 2 MeV/c².
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On the equivalence of unitarization prescriptions for the Sommerfeld enhancement
Different unitarization prescriptions for the Sommerfeld enhancement are equivalent to leading order and yield a regulator-independent formula for multi-state systems written only in terms of the standard enhancement factor, the hard annihilation amplitude, and the long-range S-matrix.
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Minimal Freeze-in Dark Matter: Reviving electroweak doublet dark matter with Boltzmann suppressed freeze-in
Electroweak SU(2)_L doublet fermion dark matter with mass above 10^10 GeV (or 300 GeV if pseudo-Dirac) is produced by Boltzmann-suppressed freeze-in above the reheat temperature and evades direct detection while never thermalizing.
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Electroweak Doublet Dark Matter for a Galactic Halo Gamma-Ray Excess
Electroweak doublet dark matter with Higgs-portal interactions accounts for the Galactic halo gamma-ray excess via gauge boson annihilation and allows inelastic scattering with ~100 keV splitting.