Chronology of Milestone Events in Particle Physics - PEVSNER 1961
Chronology of Milestone Events in Particle Physics

PEVSNER 1961

Pevsner, A.; Kraemer, R.W.; Nussbaum, M.; Richardson, C.S.; Schlein, P.; Strand, R.C.; Toohig, T.; Block, M.M.; Engler, A.; Gessaroli, R.; Meltzer, C.;
Evidence for a Three-Pion Resonance Near 550 MeV
Phys. Rev. Lett. 7 (1961) 421;

Reprinted in
R. N. Cahn and G. Goldhaber, The Experimental Foundations of Particle Physics, Cambridge Univ. Press (1991) 138.

Summary
A study has been under way of multipion resonances in π+ deuteron reactions observed in the Lawrence Radiation Laboratory 72-in. bubble chamber exposed to a 1.23 BeV/c pion beam from the Bevatron. A preliminary report on this research was given at the Aix-en-Provence Conference on Elementary Particles where the existence of the Ω meson reported by the Berkeley group was confirmed. Since then these data have been substantially increased, although the experiment is still in progress. The existence of a second neutral 3-pion resonance with a mass of approximately 550 MeV is indicated by this larger sample of events. (Extracted from the introductory part of the paper.).

Accelerator LBL Detectors DBC-72IN

Related references
See also
G. F. Chew, Phys. Rev. Lett. 4 (1960) 142;
P. Strivastava and E. C. G. Sudarshan, Phys. Rev. 110 (1958) 765;
J. J. Sakurai, Ann.Phys. 11 (1960) 1;
Y. Nambu, Phys. Rev. 106 (1957) 1366;
R. Hofstadter and R. Hernan, Phys. Rev. Lett. 6 (1961) 293;
S. Bergia, A. Stanghellini, S. P. Fubini, and C. Villi, Phys. Rev. Lett. 6 (1961) 367;
M. M. Block, Phys. Rev. 101 (1956) 796;
Analyse data from
J. J. Sakurai, Phys. Rev. Lett. 7 (1961) 355;
B. C. Maglic et al., Phys. Rev. Lett. 7 (1961) 178;

Reactions
  π+ deuteron 2p π+ πo π– 1.23 GeV (Plab) mass, ang
  π+ n p π+ πo π– 1.23 GeV (Plab) mass, ang
  ω π+ πo π–
  η π+ πo π–

Particles studied
  ω ex, mass, w, qn
  η ex, mass, w, qn

Record comments
First evidence for the η meson. Confirmation of the ω meson.
    
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