Study of Σ(1670) resonance production K^-p interactions

Thesis/Dissertation · Sun Sep 01 04:00:00 EDT 1974

DOI:https://doi.org/10.2172/4176179· OSTI ID:4176179

Estes, Robert David ^[1]

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1. Univ. of California, Berkeley, CA (United States)

Production of the Σ(1670) resonance in the reactions K^-p → Λπ⁺π^-, K^-p → Σ0⁺π⁺0π^-, K^-p → Σ^-π⁺π⁰, and K^-p → Σ^±π^± π⁺π^- for K^- beam momenta around 2.1 and 2.6 GeV/c in data from the Bevatron 72-inch hydrogen bubble chamber is analyzed. Large variations in the ratio of the cross section for the reaction K^-p → Σ⁺(1670)π^- → Λ(1405)π⁺π^- → Σ^±π⁺π^- to the cross section for the reaction K^- → Σ⁺ 670)π^- → (Σπ)⁺π^- as a function of the Σ(1670) production angle. This variation is interpreted as strong evidence that more than one resonance contributes to the Σ(1670) enhancement. Analysis of the production angular distributions of the three Σ(1670) decay modes Λpi' Σπ, and Λ(1405)π shows that the results are consistent with the existence of a Σ(1670) resonance that decays mainly into Λ(1405)π and another that decays mainly into Λπ and Σπ. Other production experiments are seen to be consistent with these results. The Λπ/Σπ branching ratio is estimated to be 0.8 ± 0.1. The data are also consisent with the existence of two interfering Σ(1670) resonances with approximately equal masses and widths.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: US Atomic Energy Commission (AEC)
• DOE Contract Number: W-7405-ENG-48
• NSA Number: NSA-32-018395
• OSTI ID: 4176179
• Report Number(s): LBL--3827
• Country of Publication: United States
• Language: English

Related Subjects

*LAMBDA-1405 RESONANCES-- PARTICLE PRODUCTION
*SIGMA-1670 RESONANCES- - PARTICLE PRODUCTION
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
CROSS SECTIONS
GEV RANGE 01-10
KAON- PROTON INTERACTIONS
KAONS MINUS
LAMBDA PARTICLES
LINEAR MOMENTUM
N64130* --Physics (High Energy)--Particle Interactions & Properties (Experimental)--Strong (Baryon-induced)
PARTICLE WIDTHS
PIONS MINUS
PIONS NEUTRAL
PIONS PLUS
SIGMA MINUS
SIGMA PLUS
VARIATIONS