Féeton (B-L Gauge Boson) Dark Matter for the 511-keV Gamma-Ray Excess and the Prediction of Low-energy Neutrino Flux
Chinese Physics C(2023)
摘要
The féeton is the gauge boson of the U(1)_B-L gauge theory. If the
gauge coupling constant is extremely small, it becomes a candidate for dark
matter. We show that its decay to a pair of electron and positron explains the
observed Galactic 511-keV gamma-ray excess in a consistent manner. This
féeton dark matter decays mainly into pairs of neutrino and anti-neutrino.
Future low-energy experiments with improved directional capability make it
possible to capture those neutrino signals. The seesaw-motivated parameter
space predicts a relatively short féeton lifetime comparable to the current
cosmological constraint.
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