Chronology of Milestone Events in Particle Physics - GOLDBERG 1964C
Chronology of Milestone Events in Particle Physics

GOLDBERG 1964C

Goldberg, M.; Grundzik, M.; Lichtman, S.; Leitner, J.; Primer, M.; Connolly, P.L.; Hart, E.L.; Lai, K.W.; London, G.W.; Samios, N.P.; Yamamoto, S.S.;
Existence of a New Meson of Mass 960 MeV
Phys. Rev. Lett. 12 (1964) 546;

Summary
In this note we present evidence for the existence of a new meson of strangeness-zero, which we temporarily call the "X0''. Its mass and full width are M ~ 960 MeV and < 25 MeV; its isospin is either 0 or 1. Data relevant to determination of its other quantum numbers are now being analyzed and the results will be reported in a subsequent paper.
The data discussed here come from a bubble chamber study of the K p interactions at 2.3 BeV/c. The general features of this study have been described elsewhere. The evidence for the existence of X0 comes primarily from effective-mass studies in the following reaction channels: K p + neutrals, (1) K p + + o, (2) K p + ( neutrals with mass > mo) (3) The number of events in each channel are 1277, 43, and 415, respectively, all coming from a complete sample occurring within a suitable fiducial region. (Extracted from the introductory part of the paper.).

Accelerator BNL Detectors HBC-20IN

Related references
More (earlier) information appears in
M. Goldberg et al., Bull.Am.Phys.Soc. 9 (1964) 23;

Reactions
  K p neutral (neutrals) 2.33 GeV (Plab) mass
  K p + (neutrals) 2.33 GeV (Plab) mass
  K p 2+ o 2 2.33 GeV (Plab) mass
  K p mesono 2.33 GeV (Plab)

Particles studied
  ' ex, mass, w

Record comments
Confirmation of the ' meson.
    
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