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ALVAREZ 1959

Alvarez, L.W.; Eberhard, P.H.; Good, M.L.; Graziano, W.; Ticho, H.K.; Wojcicki, S.G.;
Neutral Cascade Hyperon Event
Phys. Rev. Lett. 2 (1959) 215;

Motivation
The existence of a neutral cascade hyperon Ξ^o has been predicted theoretically, on the basis of the strangeness theory of Gell-Mann and Nishijima, as the neutral counterpart of the negative cascade hyperon, Ξ^–, which decays by Ξ^– → π^– Λ.
In an attempt to establish the existence of this particle the Lawrence Radiation Laboratory 15-in. hydrogen bubble chamber was operated in a separated beam of (1.15 ± 0.02) BeV/ c K^– mesons produced by the Bevatron. (Extracted from the introductory part of the paper.).

Accelerator LBL Detectors HBC-15IN

Related references
See also
P. Nordin et al., Phys. Rev. Lett. 1 (1958) 380;
A. H. Rosenfeld et al., Phys. Rev. Lett. 2 (1959) 112;
M. Gell-Mann and A. H. Rosenfeld, Ann. Rev. Nucl. Sci. 7 (1957) 410;
M. Gell-Mann, Nuovo Cim. Suppl. 4 (1956) 848;
F. S. Crawford et al., Phys. Rev. Lett. 2 (1959) 110;
R. Armenteros et al., Phil. Mag. 43 (1952) 597;
C. Franzinetti, G. Morpurgo, Nuovo Cim. Suppl. 6 (1957) 565;
C. A. Coombes et al., Phys. Rev. 112 (1958) 1303;
F. S. Crawford et al., Phys. Rev. Lett. 1 (1958) 377;
K. Nishijima, Progr. of Theor. Phys. 13 (1955) 285;

Reactions

	K– p 2vee	1.15 GeV (Plab)	mass
	K– p Ξo KS	1.15 GeV (Plab)	p, cs
	Λ p π–
	KS π+ π–
	Ξo Λ neutral

Particles studied

Ξo

ex, mass, qn

Record comments
First evidence for the Ξ^o.

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