Field-induced axion emission via process $e^{+}{e}^{-}\to a$ in plasma

Abstract

The annihilation into axion $e^{+}{e}^{-}\to a$ is investigated in a plasma and an external magnetic field. This process via a plasmon intermediate state has a resonant character at a particular energy of the emitted axion. The emissivity by $e^{+}{e}^{-}\to a$ is compared with the axion cyclotron emissivity.

Comments: 8 pages, latex, 4 PS figures