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Two examples of Λ 0 - θ 0 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 0 and Λ 0 particles. One case is internally consistent with the production of a Λ 0 and θ 0 directly. The other case, in which the Λ 0 and θ 0 particles seem slightly noncoplanar with the incoming π - meson, is not internally consistent with the direct production of a Λ 0 and θ 0 . It is likely that either the θ 0 or the Λ 0 or both θ 0 and Λ 0 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 0 and Λ 0 . If one supposes that the Λ 0 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.
Physical Review – American Physical Society (APS)
Published: Jun 1, 1955
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