Weak nonleptonic hyperon decays and hadronic loops

Journal Article · Fri May 01 04:00:00 EDT 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.45.3153· OSTI ID:7044146

Zenczykowski, P ^[1]

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1. Department of Physics, University of Guelph, Guelph, Ontario, N1G2W1 (Canada)

The influence of hadronic-loop effects on the SU(3) structure of the soft-pion contribution to the {ital S}-wave weak nonleptonic hyperon decays is studied in the framework of the unitarized quark model. The effects considered originate from the interference of strong and weak amplitudes of the {ital P}-wave hyperon decays. When the baryon-pole model is used to describe the latter it is found that the quark sea generated by hadronic loops renormalizes the sizes of the two independent SU(3) amplitudes from their naive quark model ratio of {ital f}/{ital d}={minus}1 to {ital f}/{ital d}{approx}{minus}1.6. This is in remarkably good agreement with the phenomenological estimate of the soft-pion contribution performed by Pham who, after subtracting the terms violating the modified Lee-Sugawara relation, obtained ({ital f}/{ital d}){sub soft} pion={minus}1.5. A brief discussion of the uncertainties resulting from our poor knowledge of the meson-pole contribution is also included.

• OSTI ID: 7044146
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 45:9; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662230 -- Quantum Chromodynamics-- (1992-)
662240 -- Models for Strong Interactions-- (1992-)
662360* -- Decays of Baryons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BAG MODEL
BARYONS
COMPOSITE MODELS
COUPLING CONSTANTS
DECAY
ELEMENTARY PARTICLES
EXTENDED PARTICLE MODEL
FERMIONS
FIELD THEORIES
FUNCTIONS
HADRONS
HYPERONS
LIE GROUPS
MATHEMATICAL MODELS
P WAVES
PARTIAL WAVES
PARTICLE DECAY
PARTICLE MODELS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MODEL
RENORMALIZATION
S WAVES
STRANGE PARTICLES
SU GROUPS
SU-3 GROUPS
SYMMETRY GROUPS
UNITARITY
WAVE FUNCTIONS
WEAK HADRONIC DECAY
WEAK PARTICLE DECAY