Decays of the K sup minus p atom and the. Lambda. (1405)

Journal Article · Thu Aug 01 04:00:00 EDT 1991 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.44.607· OSTI ID:5185220

Burkhardt, H ^[1]; Lowe, J ^[2]

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1. Department of Mathematics, University of Nottingham, Nottingham NG7 2RD (England)
2. Department of Physics, University of New Mexico, Albuquerque, New Mexico (USA) Department of Physics, University of Birmingham, Birmingham B152TT (England)

To investigate differences between some recent calculations on the decays of the {ital K}{sup {minus}}{ital p} atom, we calculate the pionic decays {ital K}{sup {minus}}{ital p}{r arrow}{Lambda}{pi}{sup 0}, {Sigma}{sup +}{pi}{sup {minus}}, {Sigma}{sup 0}{pi}{sup 0}, and {Sigma}{sup {minus}}{pi}{sup +} in an isobar model and compare them with experimental rates determined from measured branching ratios together with the imaginary part of the {ital {bar K}N} scattering amplitude. The comparison shows that the coupling constants at the strong-interaction vertices are reduced significantly from the on-shell values. These coupling constants are then applied to an isobar-model calculation of the radiative transition rates. Comparing these with results from a recent experiment gives values for the radiative decay widths of the {Lambda}(1405): {Gamma}{sub {Lambda}(1405){r arrow}{Lambda}{gamma}}=27{plus minus}8 keV and {Gamma}{sub {Lambda}(1405){r arrow}{Sigma}}{sup 0}{gamma}=10{plus minus}4 or 23{plus minus}7 keV.

• OSTI ID: 5185220
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 44:2; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

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645103* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AMPLITUDES
ANTIKAONS
ANTIMATTER
ANTIPARTICLES
ATOMS
BAG MODEL
BARYONS
BOSONS
BRANCHING RATIO
CHARGED-PARTICLE REACTIONS
COMPOSITE MODELS
COUPLING CONSTANTS
DECAY
ELEMENTARY PARTICLES
EXTENDED PARTICLE MODEL
FERMIONS
HADRON REACTIONS
HADRONIC ATOMS
HADRONS
HYPERONS
ISOBAR MODEL
KAON REACTIONS
KAONIC ATOMS
KAONS
LAMBDA BARYONS
LAMBDA PARTICLES
LAMBDA-1405 BARYONS
MATHEMATICAL MODELS
MATTER
MESIC ATOMS
MESON REACTIONS
MESONS
NUCLEAR MODELS
NUCLEAR REACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PIONS
PSEUDOSCALAR MESONS
QUARK MODEL
SCATTERING AMPLITUDES
SHELL MODELS
SIGMA BARYONS
SIGMA PARTICLES
STRANGE MESONS
STRANGE PARTICLES