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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 1964

Christenson, J.H.; Cronin, J.W.; Fitch, V.L.; Turlay, R.;
Evidence for the 2π Decay of the K_L 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.

Motivation
This Letter reports the results of experimental studies designed to search for the 2 π decay of the K₂^o meson. Several previous experiments have served^1,2 to set an upper limit of 1/300 for the fraction of K₂^o'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;

Reactions

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

Particles studied

	Ko	pw, qn
	KL	pw, qn

Record comments
First evidence for CP violation.

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