Daniel, R. R. ; Davies, J. H. ; Mulvey, J. H. ; Perkins, D. H. (1952) LXXII. Nuclear interactions of great energy.—Part I. evidence for the creation of heavy mesons Philosophical Magazine Series 7, 43 (342). pp. 753-774. ISSN 1941-5982
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Related URL: http://dx.doi.org/10.1080/14786440708520992
The masses of charged mesons, produced among the 'shower' particles in the nuclear interactions of protons of great energy have been determined by scattering and grain-density measurements. For energies greater than 50 Bev heavy mesons of mean mass ~1300 me, provisionally identified as κ-mesons, are produced with a frequency comparable with that of the π-mesons. Evidence for the creation of such heavy mesons is also provided by an observed decrease in the ratio of neutral π-mesons to shower particles at very high energies. A method is described for measuring the lifetime of the neutral φ-meson, which takes advantage of the existence of an alternative mode of decay : φ0→γ +β ++β -. It is shown that the proportion of φ-mesons which decay in this second mode is not greater than 4%. The preliminary observations suggest that the mean lifetime is about 10-14 see.
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