Observations on the decay of heavy mesons in photographic emulsions

Abstract
In 1951, two events were observed in photographic emulsions which appeared to correspond to the decay at rest of heavy charged mesons of mass ~ 1200 m e , the transmutations each involving the emission of a singly-charged particle (O’Ceallaigh 1951). The events were referred to as K 1 and K 2, respectively, and the decaying particles as K -mesons. Since these observations were made, eighteen similar examples have been found in this laboratory. They are referred to as K 3, K 4 . . . , K 20. The conditions of exposure of the plates in which they were recorded are given in table 2. Preliminary measurements, and conclusions following from them, have been reported at a number of conferences (Menon 1951; Powell 1952; Perkins 1952). This paper contains a detailed account of the measurements and their interpretation.

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