Dark radiation from dark matter produced in Z decays generates long-lived dark photons that dominate over meson decays and bremsstrahlung for small kinetic mixing and masses above the GeV scale, allowing FASER2, FACET, and MATHUSLA to probe relic-abundance-consistent regions beyond conventional dark
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Constraints on temperature-dependent CPT-violating electron-positron mass asymmetry b0(T) = α T² from BBN abundances of 4He, D, and Neff give α ≳ 10^{-6} GeV^{-1} for keV-scale effects at BBN.
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Search for Long-Lived Dark Photons from Dark Radiation at the LHC
Dark radiation from dark matter produced in Z decays generates long-lived dark photons that dominate over meson decays and bremsstrahlung for small kinetic mixing and masses above the GeV scale, allowing FASER2, FACET, and MATHUSLA to probe relic-abundance-consistent regions beyond conventional dark
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Temperature-Dependent CPT Violation: Constraints from Big Bang Nucleosynthesis
Constraints on temperature-dependent CPT-violating electron-positron mass asymmetry b0(T) = α T² from BBN abundances of 4He, D, and Neff give α ≳ 10^{-6} GeV^{-1} for keV-scale effects at BBN.