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BOLDT 1958B

Boldt, E.; Caldwell, D.O.; Pal, Y.;
Θ₁⁰-Θ₂⁰ Mass Difference
Phys. Rev. Lett. 1 (1958) 150;

Summary
We have observed directly the change with time of the nature of the neutral particle produced in association with the Λ hyperon. The "particle,'' initially the Θ⁰, is observed to interact with matter to produce another hyperon only when at some distance from its origin, and never when close to that origin. This observation is a direct confirmation of the particle-mixture theory for the Θ⁰ meson of Gell-Mann and Pais, and when quantitatively interpreted in terms of that theory, yields an estimate of the mass difference between the Θ₁⁰ (short-lived) and Θ₂⁰ (long-lived) components of the Θ⁰.

Accelerator BNL-COSMOTRON Detectors CLOUD

Related references
See also
W. F. Fry and R. G. Sachs, Phys. Rev. 109 (1958) 2212;
M. Gell-Mann and A. Pais, Phys. Rev. 97 (1955) 1387;

Reactions

	π– Fe Λ Ko X	1.5 GeV (Elab)
	Ko anti-Ko
	anti-Ko nucleus hyperon X

Particles studied

	KL	ex, mass
	KS	ex, mass

Record comments
First measurement of the K_L - K_S mass difference.

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