W-Boson Propagation Chain Reactions at the Edge of the Galactic Halo and A New Interpretation of the AMS-02 Positron Excess Problem in Japanese
Year: 2026
Type: report
Abstract: Cosmic-ray observation experiments, such as AMS-02, have reported an anomalous excess of positrons (antimatter) in the high-energy regime; however, its definitive origin remains unexplained. In this paper, we propose a novel model for the production of cosmic-ray positrons, originating from a quark asymmetry (u:d = 2:1) in the vicinity of black holes (BHs), such as those found at the center of the Milky Way galaxy. $W^+$ and $W^-$ bosons, extracted from the vicinity of a BH, are transported to the outer reaches (periphery) of the galactic halo without decaying—a process facilitated by a "confinement force" characteristic of fermionic dark matter (DM) and a chain reaction driven by the self-interaction of the $W$ bosons themselves. We demonstrate that upon reaching the boundary of the galactic halo, these bosons undergo leptonic decay (with a branching ratio of 10.8%)—a process governed by the weak interaction of the Standard Model. This mechanism translates the initial 2:1 quark asymmetry directly into the production ratio of positrons to electrons, providing a precise explanation for the observed "positron excess." Furthermore, since the high-energy electron neutrinos produced alongside these positrons travel in straight lines through space, observations of their anisotropy—conducted by future high-energy neutrino telescopes—will serve as a definitive means to verify this model.
Author: Yoshida, Takafumi
Language: Japanese
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7224820414