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BERTANZA 1962D

Bertanza, L.; Brisson, V.; Connolly, P.L.; Hart, E.L.; Mittra, I.S.; Moneti, G.C.; Rau, R.R.; Samios, N.P.; Skillicorn, I.O.; Yamamoto, S.S.; Goldberg, M.; Gray, L.; Leitner, J.; Lichtman, S.; Westgard, J.;
Possible Resonances in the Ξ π and K anti-K Systems
Phys. Rev. Lett. 9 (1962) 180;

Reprinted in
The Physical Review - the First Hundred Years, AIP Press (1995) CD-ROM.

Motivation
The purpose of this note is to report the existence of marked departures from phase space in the effective-mass distributions for the Ξ π and K anti-K states. We present evidence that, in about 25% of the events observed, the Ξ π state results from the decay of a resonant state (Ξ^*) with a mass of 1535 MeV and a full width of < 35 MeV. The observed anomaly in the K anti-K effective-mass distribution is possibly open to different interpretations. If we assume it to be due to the decay of a resonant state K^*, we find that M_K^* = 1020 MeV, and that it has a full width of 20 MeV. However, it may also be possible to explain the effect as due to S-wave K anti-K scattering. These results, as well as preliminary evidence concerning the properties of the Ξ^* and K^*, are discussed below. (Extracted from the introductory part of the paper.).

Accelerator BNL Detectors HBC-20IN

Experiment comments
79 (Ξ,π) combinations, 37 (K, anti-K) combinations.

Reactions

	K– p Ξ– K+ πo	2.24,2.5 GeV (Plab)	mass
	K– p Ξ– Ko π+	2.24,2.5 GeV (Plab)	mass
	K– p Ξo K+ π–	2.24,2.5 GeV (Plab)	mass
	K– p Ξo Ko πo	2.24,2.5 GeV (Plab)	mass
	K– p Λ K+ K–	2.24,2.5 GeV (Plab)	mass
	K– p Λ Ko anti-Ko	2.24,2.5 GeV (Plab)	mass
	Ξ(1530 P13)0 Ξ– π+
	Ξ(1530 P13)0 Ξo πo
	Ξ(1530 P13)– Ξ– πo
	Ξ(1530 P13)– Ξo π–
	φ K+ K–

Particles studied

	Ξ(1530 P13)0	ex, mass, w, qn
	Ξ(1530 P13)–	ex, mass, w, qn
	Ξ(1530 P13)	ex, mass, w, qn
	φ	ex, mass, w, qn

Record comments
Confirmation of the existence of the Ξ(1530 P₁₃) resonance. First evidence for the φ resonance.

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