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Cloud-Chamber Study of Negative Strange Particles

Trilling, G. H. and Neugebauer, G. (1956) Cloud-Chamber Study of Negative Strange Particles. Physical Review, 104 (6). pp. 1688-1694. ISSN 0031-899X. doi:10.1103/PhysRev.104.1688.

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A detailed analysis of the decays in flight of negative K mesons and hyperons, obtained with the 48-in. cloud chambers in Pasadena, is presented. The principal results are the following: 1. Two new fully measurable τ^− events add to the already strong evidence for the existence of this particle. 2. K^− events with a single charged secondary are shown to be most consistent with the K_(π^2) and K_(μ^2) decay modes. 3. An analysis of 7 Caltech Ξ^− events is shown to lead to a Q value of 65±3 Mev, and a 50% confidence lower limit to the lifetime of 4.6 × 10^(−10) sec. A rough upper limit to the lifetime of 2 × 10^(−8) sec, based on the predictions of the strangeness theory, is obtained. Angular correlations among the Ξ^− secondaries are studied, but the statistics are insufficient to permit any significant conclusion. An additional event which is most easily interpreted as a Ξ^− decay is discussed. 4. The V^− events which are neither K^− nor Ξ^− are shown to have a lifetime less than or equal to (1.52^+(0.38)_(−0.25))×10^(−10) sec and a P^* value, based on their transverse momentum distribution, of 197±7 Mev/c. These values correspond satisfactorily with the presently known properties of the Σ^−hyperon. 5. It is estimated from a comparison of the numbers of identified Ξ−'s and V^−'s that the fraction of Λ^0 particles which decay into charged secondaries is greater than 0.40^(+0.15)_(−0.11), and can, insofar as the present data are concerned, be as high as unity. All errors quoted in the above results are 50% confidence limits.

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Additional Information:© 1956 American Physical Society. (Received September 11, 1956) Assisted by the joint program of the Office of Naval Research and the U. S. Atomic Energy Commission. The authors wish to express their appreciation to Professor C. D. Anderson and Professor R. B. Leighton for constant encouragement and valuable discussions. They are also indebted to Dr. V. A. J. van Lint, Dr. A. A. Strassenburg, Dr. C. A. Rouse, Dr. J. D. Sorrels, J. A. Kadyk, and R. L. Luttermoser for assistance in the operation of the equipment and the analysis of the data.
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Office of Naval Research (ONR)UNSPECIFIED
Atomic Energy CommissionUNSPECIFIED
Issue or Number:6
Record Number:CaltechAUTHORS:20180111-144252280
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84273
Deposited By: George Porter
Deposited On:12 Jan 2018 00:12
Last Modified:15 Nov 2021 20:18

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