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Analysis of τ-mesons

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Abstract

We describe in this paper measurements made on the decay products of 11 τ-mesons observed in large nuclear emulsion block detectors. Out of the 33 charged decay products; 27 have been arrested in the block, and were identified as π-mesons. The charge of the τ-meson was found to be positive in 6 cases. In one case the charge of the τ-meson is possibly negative and in 4 cases it could not be determined. Omitting one τ-meson in which a high energy γ-ray is emitted and which has been reported earlier1 the weighted mean Q-value of the remaining 10 τ-mesons is:

$$Q_\tau = 76 \cdot 3 \pm 0 \cdot 3 MeV$$

which gives the mass of the τ-meson as:

$$m_\tau = 968 \cdot 7 \pm 0 \cdot 6 m_e $$

This value is slightly higher than the mean value 965·5±0·7m e compiled by Amaldiet al. 2 from measurements of various laboratories.

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Authors and Affiliations

  1. Tata Institute of Fundamental Research, Bombay 1

    P. S. Goel & K. A. Neelakantan

Authors
  1. P. S. Goel
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  2. K. A. Neelakantan
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(Communicated by Professor Bernard Peters,F.A.Sc.)

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Goel, P.S., Neelakantan, K.A. Analysis of τ-mesons. Proc. Indian Acad. Sci. 42, 22–27 (1955). https://doi.org/10.1007/BF03053557

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  • DOI: https://doi.org/10.1007/BF03053557

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