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GOLDBERG 1964C

Goldberg, M.; Grundzik, M.; Lichtman, S.; Leitner, J.; Primer, M.; Connolly, P.L.; Hart, E.L.; Lai, K.W.; London, G.W.; Samios, N.P.; Yamamoto, S.S.;
Existence of a New Meson of Mass 960 MeV
Phys. Rev. Lett. 12 (1964) 546;

Summary
In this note we present evidence for the existence of a new meson of strangeness-zero, which we temporarily call the "X^o''. Its mass and full width are M ~ 960 MeV and Γ < 25 MeV; its isospin is either 0 or 1. Data relevant to determination of its other quantum numbers are now being analyzed and the results will be reported in a subsequent paper.
The data discussed here come from a bubble chamber study of the K^– p interactions at 2.3 BeV/c. The general features of this study have been described elsewhere. The evidence for the existence of X^o comes primarily from effective-mass studies in the following reaction channels: K^– p → Λ + neutrals, (1) K^– p → Λ π⁺ π^– π⁺ π^– π^o, (2) K^– p → Λ π⁺ π^– ( neutrals with mass > m_π^o) (3) The number of events in each channel are 1277, 43, and 415, respectively, all coming from a complete sample occurring within a suitable fiducial region. (Extracted from the introductory part of the paper.).

Accelerator BNL Detectors HBC-20IN

Related references
More (earlier) information appears in
M. Goldberg et al., Bull.Am.Phys.Soc. 9 (1964) 23;

Reactions

	K– p Λ neutral (neutrals)	2.33 GeV (Plab)	mass
	K– p Λ π+ π– (neutrals)	2.33 GeV (Plab)	mass
	K– p Λ 2π+ πo 2π–	2.33 GeV (Plab)	mass
	K– p Λ mesono	2.33 GeV (Plab)

Particles studied

η'

ex, mass, w

Record comments
Confirmation of the η' meson.

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