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Recently, several papers discussed on the existence of a low mass newstructure at a mass close to M=214.3 MeV. It was suggested that the$\Sigma^{+}$ disintegration: $\Sigma^{+}\to$pP$^{0}$, P$^{0}\to\mu^{-}\mu^{+}$proceeds through an intermediate particle P$^{0}$ having such mass. The presentwork intends to look at other new or available data, in order to observe theeventual existence of small narrow peaks or shoulders in very low mesonicmasses. Indeed narrow structures were already extracted from various data indibaryons, baryons and mesons (at larger masses that those studied here).

Search for Low Mass Exotic mesonic structures. Part I: experimental results