Chronology of Milestone Events in Particle Physics - ARMENTEROS 1951
Chronology of Milestone Events in Particle Physics

ARMENTEROS 1951

Armenteros, R.; Barker, K.H.; Butler, C.C.; Cachon, A.; Chapman, A.H.;
Decay of V Particles
Nature 167 (1951) 501;

Summary
... we can summarize the main results of the present investigations as follows.
(a) The occurrence of V-tracks in the chamber has again been confirmed.
(b) Probably not more than 10 per cent of the V-tracks can be explained by processes other than the spontaneous decay of new unstable particles.
(c) Momentum measurements on fifty-four secondary particles from neutral V-decays have been made and, together with ionization estimates, make it possible to identify with certainty both protons and mesons.
(d) Assuming that only two particles are produced by the neutral decays, two schemes are suggested to explain the photographs: V0 p+ -, with the V0 mass in the range (2,000 - 2,500) x me, V0 + - with the V0 mass about 1,000 me. The relative frequency of these two processes will be discussed in a later paper, but the evidence is already strong for the existence of two types of V0-particle.
(e) Six charged decays have been observed, but no definite conclusion have been reached about the mass of the charged V-particles.
(Extracted from the introductory part of the paper.).

Accelerator COSM Detectors CLOUD

Reactions
  unspec nucleus vee X
  vee p
  vee +
  p
  Ko +

Particles studied
  ex
  Ko ex

Record comments
Evidence for the possible existence of the hyperon. First evidence for the Ko meson.
    
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