Recently, several papers discussed the existence of a low mass leptonic structure. It was suggested that the $\Sigma^{ +}$ disintegration: $\Sigma^{ +}\to$pP$^{ 0}$, P$^{ 0}\to\mu^{ -}\mu^{ +}$ proceeds through an intermediate particle P$^{ 0}$ having a mass close to M$\approx$~214.3 MeV. The present work intends to look at other available data, in order to observe the eventual existence of a small peak or shoulder, at a mass close to M=214.3 MeV, which can strengthen the existence of a state produced by two leptons of opposite electric charge.
Categories: nucl-ex