Chronology of Milestone Events in Particle Physics - IMPEDUGLIA 1958
Chronology of Milestone Events in Particle Physics


Impeduglia, J.; Plano, R.; Samios, N.P.; Scwartz, M.; Steinberger, J.;
Decay of the Pion
Phys. Rev. Lett. 1 (1958) 249;

The electron-neutrino decay mode of the pion has been the object of several unsuccessful searches. The latest and most sensitive of these puts an upper limit of about 10-5 for the relative frequency of this process.
On the other hand, there has recently been spectacular progress in the understanding of nuclear decay and of decay in terms of a "universal'' V - A theory. It has been emphasized, especially by Feynman, that in a universal V - A theory the ratio of pion decay to decay should be 1/8000, and that deviations from this value are difficult and awkward to accommodate theoretically.
There is, therefore, considerable interest in the announcement of the CERN group that positive evidence for the e decay in the theoretically expected order of magnitude has been found. In view of the disagreement between these results and those of Anderson and Lattes, there may be some interest in the progress of our experiment on this decay. (Extracted from the introductory part of the paper.).

Accelerator NEVI-CYC Detectors HBC-12IN

Related references
See also
R. P. Feynman and M. Gell-Mann, Phys. Rev. 109 (1958) 193;
Analyse data from
S. Lokanathan and J. Steinberger, Nuovo Cim. Suppl. 2 (1955) 151;
H. L. Anderson and C. M. G. Lattes, Nuovo Cim. 6 (1957) 1356;
E. C. G. Sudarshan and R. E. Marshak, Phys. Rev. 109 (1958) 1860;
T. Fazzini et al., Phys. Rev. Lett. 1 (1958) 247;
H. L. Friedman and J. Rainwater, Phys. Rev. 84 (1951) 684;
M. Goldhaber, L. Grodzins, and A. W. Sunyar, Phys. Rev. 109 (1958) 1015;

  + e+ e

Particles studied
  + pw

Record comments
Confirmation of e2 decay.
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