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FOWLER 1954C

Fowler, W.B.; Shutt, R.P.; Thorndike, A.M.; Whittemore, W.L.;
Production of Heavy Unstable Particles by Negative Pions
Phys. Rev. 93 (1954) 861;

Reprinted in
R. N. Cahn and G. Goldhaber, The Experimental Foundations of Particle Physics, Cambridge Univ. Press (1991) 75.
The Physical Review - the First Hundred Years, AIP Press (1995) 838.

Abstracts
In addition to two previously discussed cloud-chamber examples of V-particle production by 1.5 BeV π^– mesons from the Cosmotron, four further examples are discussed here. In two of the new examples a Λ⁰(V₁⁰) and a vartheta⁰(V₄⁰) are seen to decay in a geometry indicating that they were produced together in a π^– p collision. A third example is best interpreted as production of a Λ^-(V₁^-) together with a K⁺(V⁺₂) by a π^– colliding with a proton. A fourth example shows of ~ 1 millibarn for V-particle production is inferred from the number of π^– p collisions observed.

Accelerator BNL-COSMOTRON Detectors CLOUD

Related references
More (earlier) information appears in
W. B. Fowler et al., Phys. Rev. 91 (1953) 1287;
See also
G. Ascoli, Phys. Rev. 90 (1953) 1079;
D. C. Peaslee, Phys. Rev. 86 (1952) 127;
G. D. Rochester and C. C. Butler, Rep.Prog.Phys. 16 (1953) 364;
E. Fermi, Progr. of Theor. Phys. 5 (1950) 570;
Analyse data from
C. M. York, R. B. Leighton, and E. K. Bjornerud, Phys. Rev. 90 (1953) 167;
R. W. Thompson et al., Phys. Rev. 90 (1953) 1122;
R. L. Cool, L. Madansky, and O. Piccioni, Phys. Rev. 93 (1954) 637;
W. B. Fretter, May, and Nakada, Phys. Rev. 89 (1953) 168;
R. B. Leighton, S. D. Wanlass, and C. D. Anderson, Phys. Rev. 89 (1953) 148;
M. Goldhaber, Phys. Rev. 92 (1953) 1279;
M. Gell-Mann, Phys. Rev. 92 (1953) 833;
A. Pais, Phys. Rev. 86 (1952) 663;
C. C. Butler, Repts. Progr. in Phys. 16 (1953) 364;

Experiment comments
26000 photographs, 4 events with associative strange particle production.

Reactions

	π– p Λ Ko	1.5 GeV (Tlab)	cs
	π– p Σ– K+	1.5 GeV (Tlab)	cs
	Λ p π–
	Ko π+ π–
	Σ– n π–

Particles studied

Σ–

ex, mass, w

Record comments
Confirmation of the existence of the Σ^–. Evidence for the associated production of strange particles.

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