Cloud-Chamber Observations of Some Unusual NeutralVParticles Having Light Secondaries

Abstract

From six cloud-chamber photographs of unusual ${V}^{0}$ decay events, the following conclusions are drawn: (1) there is a neutral $V$ particle that decays into two particles lighter than $\ensuremath{\kappa}$ mesons with a $Q$ value too small to be consistent with a ${\ensuremath{\theta}}^{0}(\ensuremath{\pi}, \ensuremath{\pi}, 214 \mathrm{Mev})$ particle; (2) some of these events cannot be explained in terms of the decay of a ${\ensuremath{\tau}}^{0}({\ensuremath{\pi}}^{0}, {\ensuremath{\pi}}^{\ensuremath{-}}, {\ensuremath{\pi}}^{+}, Q\ensuremath{\sim}80 \mathrm{Mev})$ particle; (3) these events can be explained by any one of a number of three-body decay schemes, but two different types of $V$ particles must be postulated if two-body decays are assumed.