Chronology of Milestone Events in Particle Physics - CHRISTENSON 1964
Chronology of Milestone Events in Particle Physics

  Nobel prize to J. W. Cronin and V. L. Fitch awarded in 1980 "for their discovery of violations of fundamental symmetry principles in the decay of neutral K mesons''  


Christenson, J.H.; Cronin, J.W.; Fitch, V.L.; Turlay, R.;
Evidence for the 2 Decay of the KL Meson
Phys. Rev. Lett. 13 (1964) 138;

Reprinted in
R. N. Cahn and G. Goldhaber, The Experimental Foundations of Particle Physics, Cambridge Univ. Press (1991) 214.
The Physical Review - the First Hundred Years, AIP Press (1995) 893.
CP violation, editor L. Wolfenstein, p. 14-16..
D. B. Lichtenberg (ed.) and S. P. Rosen (ed.), Developments in the Quark Theory of Hadrons, Vol.1, 224-226.

This Letter reports the results of experimental studies designed to search for the 2 decay of the K20 meson. Several previous experiments have served1,2 to set an upper limit of 1/300 for the fraction of K20's which decay into two charged pions. The present experiment, using spark chamber techniques, proposed to extend this limit. (Extracted from the introductory part of the paper.).

Accelerator BNL Detectors DAS

Related references
See also
M. Bardon, K. Lande, L. M. Lederman, and W. Chinowsky, Ann.Phys. 5 (1958) 156;
R. K. Adair et al., Phys. Rev. 132 (1963) 2285;
D. Luers, I. S. Mittra, W. J. Willis, and S. S. Yamamoto, Phys. Rev. 133 (1964) B1276;
D. Neagu et al., Phys. Rev. Lett. 6 (1961) 552;

  p Be + X 30 GeV (Plab) mass
  KL + qnc

Particles studied
  Ko pw, qn
  KL pw, qn

Record comments
First evidence for CP violation.
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