Chronology of Milestone Events in Particle Physics - BERTANZA 1962D
Chronology of Milestone Events in Particle Physics

BERTANZA 1962D

Bertanza, L.; Brisson, V.; Connolly, P.L.; Hart, E.L.; Mittra, I.S.; Moneti, G.C.; Rau, R.R.; Samios, N.P.; Skillicorn, I.O.; Yamamoto, S.S.; Goldberg, M.; Gray, L.; Leitner, J.; Lichtman, S.; Westgard, J.;
Possible Resonances in the and K Systems
Phys. Rev. Lett. 9 (1962) 180;

Reprinted in
The Physical Review - the First Hundred Years, AIP Press (1995) CD-ROM.

Motivation
The purpose of this note is to report the existence of marked departures from phase space in the effective-mass distributions for the and K states. We present evidence that, in about 25% of the events observed, the state results from the decay of a resonant state (*) with a mass of 1535 MeV and a full width of < 35 MeV. The observed anomaly in the K effective-mass distribution is possibly open to different interpretations. If we assume it to be due to the decay of a resonant state K*, we find that MK* = 1020 MeV, and that it has a full width of 20 MeV. However, it may also be possible to explain the effect as due to S-wave K scattering. These results, as well as preliminary evidence concerning the properties of the * and K*, are discussed below. (Extracted from the introductory part of the paper.).

Accelerator BNL Detectors HBC-20IN

Experiment comments
79 (,) combinations, 37 (K,) combinations.

Reactions
  K p K+ o 2.24,2.5 GeV (Plab) mass
  K p Ko + 2.24,2.5 GeV (Plab) mass
  K p o K+ 2.24,2.5 GeV (Plab) mass
  K p o Ko o 2.24,2.5 GeV (Plab) mass
  K p K+ K 2.24,2.5 GeV (Plab) mass
  K p Ko o 2.24,2.5 GeV (Plab) mass
  (1530 P13)0 +
  (1530 P13)0 o o
  (1530 P13) o
  (1530 P13) o
  K+ K

Particles studied
  (1530 P13)0 ex, mass, w, qn
  (1530 P13) ex, mass, w, qn
  (1530 P13) ex, mass, w, qn
  ex, mass, w, qn

Record comments
Confirmation of the existence of the (1530 P13) resonance. First evidence for the resonance.
    
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