Looking for Lights from the Darkness: Signals from MeV-scale Solar Axion-like Particles

Yu-Cheng Qiu, Yongchao Zhang

The axion-like particles $a$ can be produced in the Sun via the process of $p+D\to {}^3\mathrm{He}+a$, with mass up to 5.5 MeV. The photons in the subsequent decay $a\to \gamma \gamma$ can…