Chronology of Milestone Events in Particle Physics - GOLDHABER 1959
Chronology of Milestone Events in Particle Physics

GOLDHABER 1959

Goldhaber, G.; Fowler, W.B.; Goldhaber, S.; Hoang, T.F.; Kalogeropoulos, T.E.; Powell, W.M.;
Pion-Pion Correlations in Antiproton Annihilation Events
Phys. Rev. Lett. 3 (1959) 181;

Summary
We have observed angular correlation effects between pions emitted from antiproton annihilation events. This experiment was carried out with a separated antiproton beam of momentum p = 1.05 BeV/c. A total of 2500 annihilation events were observed in 20000 pictures taken with the Lawrence Radiation Laboratory 30-in. propane bubble chamber.
Pion pairs formed by the charged pions emitted in an antiproton-annihilation event can be considered in two groups: viz., like pairs (in the isotopic-spin state I = 2) and unlike pairs (in the isotopic-spin states I = 0, 1, or 2). We searched for correlation effects in these separate groups. Our results show that the distribution of the angles between pions of like charges is strikingly different from the distribution of the angles between pions of unlike charges. (Extracted from the introductory part of the paper.).

Accelerator LBL Detectors HLBC-30IN

Related references
See also
L. W. Alvarez et al., Phys. Rev. Lett. 2 (1959) 215;
W. R. Frazer and J. R. Fulco, Phys. Rev. Lett. 2 (1959) 365;
O. Chamberlain et al., Phys. Rev. 113 (1959) 1615;
P. P. Strivastava and E. C. G. Sudarshan, Phys. Rev. 110 (1958) 765;

Reactions
  p 2+ 2 1.05 GeV (Plab) cor, ang
  p 3+ 3 1.05 GeV (Plab) cor, ang

Record comments
First observation of an enhancement in the production of like-charge pairs of pions with similar momenta.
    
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