Pionium in the elementary particle decays

Abstract

Some atomic decays of elementary particles with pionium (${\pi }^{+}{\pi }^{-}$-dimesoatom) in the final state are considered. Only for K-meson atomic decays are the corresponding branching ratios big enough to make their experimental study realistic. The $O(\alpha )$ order corrections to the lifetime of pionium are also calculated.

Comments: 12 pages, to appear in Pis'ma Zh. Eks. Teor. Fiz. 60(1994),673