Abstract
In an emulsion block detector1 exposed in the stratosphere three cases of the production ofτ-mesons in nuclear disintegrations have been observed and 5 cases of negativeK-mesons which when brought to rest are captured by nuclei. In one case the production of aτ-meson is associated with the production of a charged hyperon in the same nuclear event. In another case the production of a negativeK-meson is associated with the production of a slow positiveK-meson. The production ratio of slowτ-mesons to slow positiveπ-mesonsτ/π +=1·1+0·8% and the ratio of slow negativeK-mesons to slow negativeπ-mesonsK −/π −=0·95±0·5%. The mass of theτ-meson is found to be
and that ofK −-mesons
Proof is given that all three of the decay products of theτ-mesons areπ-mesons. It is suggested that allτ-mesons observed to decay in emulsions are positively charged and that theK −-mesons observed by us may be the negative counterpart of this particle. Possible relations between the various phenomenologically distinguished types of chargedK-mesons are discussed.
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Communicated by Prof. H. J. Bhabha,f.r.s., f.a.sc.
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Lal, D., Pal, Y. & Peters, B. Observations onτ-mesons and onK-mesons giving rise to capture stars. Proc. Indian Acad. Sci. (Math. Sci.) 38, 398–417 (1953). https://doi.org/10.1007/BF03045249
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DOI: https://doi.org/10.1007/BF03045249