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WALKER 1955D

Walker, W.D.;
Λ-Θ Production in π^– p Collisions at 1 BeV
Phys. Rev. 98 (1955) 1407;

Abstracts
Two examples of Λ^o-θ^o production have been found in the collision of 1.0 Bev π^– mesons with protons. Data on these two cases are given. The two cases are qualitatively similar, yet there are quantitative differences in terms of the angles of production of the θ^o and Λ^o particles. One case is internally consistent with the production of a Λ^o and θ^o directly. The other case, in which the Λ^o and θ^o particles seem slightly noncoplanar with the incoming π^– meson, is not internally consistent with the direct production of a Λ^o and θ^o. It is likely that either the θ^o or the Λ^o or both θ^o and Λ^o are the products of decay of heavier parents. It is also possible that a light particle (γ or ν) may be produced simultaneously with the θ^o and Λ^o. If one supposes that the Λ^o is the product of decay of a heavier parent then the Q of such a parent, were it to decay into a proton and π^– meson, is calculated to be 117 ± 30 MeV. This Q value is close to that of the charged hyperons. A short-lived neutral hyperon of this mass has been predicted by Gell-Mann.

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Related references
See also
M. Gell-Mann, Phys. Rev. 92 (1953) 833;
Analyse data from
W. B. Fowler et al., Phys. Rev. 93 (1954) 861;
V. A. J. van Lint, G. H. Trilling, R. B. Leighton, and C. D. Anderson, Phys. Rev. 95 (1954) 295;
R. W. Thompson, Burwell, Huggert, and C. J. Karzmark, Phys. Rev. 95 (1954) 1576;
W. B. Fowler et al., Phys. Rev. 91 (1953) 1287;
R. W. Thompson et al., Phys. Rev. 90 (1953) 1122;

Reactions

	π– p Λ Ko	1.11 GeV (Elab)	cs
	π– p Σo Ko	1.11 GeV (Elab)	cs
	Λ p π–
	Ko π+ π–
	Σo Λ γ

Particles studied

Σo

ex

Record comments
Confirmation of associated production of strange particles. First indication of the existence of the Σ^o.

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