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LANDE 1956

Lande, K.; Booth, E.T.; Impeduglia, J.; Lederman, L.M.; Chinowsky, W.;
Observation of Long-Lived V Particles
Phys. Rev. 103 (1956) 1901;

Reprinted in
R. N. Cahn and G. Goldhaber, The Experimental Foundations of Particle Physics, Cambridge Univ. Press (1991) 205.
The Physical Review - the First Hundred Years, AIP Press (1995) 854.

Motivation
The application of rigorous charge conjugation invariance to strange particle interactions has led to the prediction of rather startling properties for the ⁰-meson state. Some of these are:
(I) the existence of a second neutral particle, ⁰₂, for which two-pion decay is prohibited;
(II) the consequent existence of a second lifetime, considerably longer than that for two-pion decay of the ⁰₁ ( ~ 1 x 10^-10 sec);
(III) a complicated time dependence for the nuclear interaction properties. The only additional assumption in this "particle mixture'' theory is the nonidentity of ⁰ and its antiparticle.
These theoretical considerations have stimulated us to undertake a search for long-lived neutral particles. To this end, the Columbia 36-in. magnet cloud chamber was exposed to the neutral radiation emitted from a copper target at an angle of 68^° to the 3 BeV external proton beam of the Brookhaven Cosmotron. (Extracted from the introductory part of the paper.).

Accelerator BNL-COSMOTRON Detectors CLOUD

Related references
See also
M. Gell-Mann and A. Pais, Phys. Rev. 97 (1955) 1387;
A. Pais and O. Piccioni, Phys. Rev. 100 (1955) 932;
G. Snow, Phys. Rev. 103 (1956) 1111;
S. B. Treiman and R. G. Sachs, Phys. Rev. 103 (1956) 1545;
K. M. Case, Phys. Rev. 103 (1956) 1449;
Slaughter, M. M. Block, and Harth, Bull.Am.Phys.Soc. 1 (1956) 186;
Blumenfeld, N. E. Booth, L. M. Lederman, and W. Chinowsky, Phys. Rev. 102 (1956) 1184;
M. M. Block, Harth, and R. M. Sternheimer, Phys. Rev. 100 (1955) 324;
T. D. Lee and C. N. Yang, Phys. Rev. 102 (1956) 290;
Kadyk, G. H. Trilling, R. B. Leighton, and C. D. Anderson, Bull.Am.Phys.Soc. 1 (1956) 251;
J. Ballam, Grisaru, and S. B. Treiman, Phys. Rev. 101 (1956) 1438;
O. Piccioni et al., Rev. Sci. Inst. 26 (1955) 232;

Reactions

	p Cu neutral X	3 GeV (Tlab)	angp
	Ko + o –

Particles studied

KL

ex

Record comments
First evidence for the K_L.

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