Nonleptonic weak decays of charmed baryons

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

DOI:https://doi.org/10.1103/PhysRevD.46.1042· OSTI ID:7287000

Cheng, H ^[1]; Tseng, B ^[2]

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1. Institute of Physics, Academia Sinica, Taipei, Taiwan 11529 (Taiwan, Province of China)
2. Physics Department, National Cheng Kung University, Tainan, Taiwan 70101 (Taiwan, Province of China)

Two-body nonleptonic weak decays of charmed baryons are analyzed in the framework of the pole model, which is more general and pertinent than current algebra since its use is not restricted to the soft meson limit and to the pseudoscalar-meson final state. The {ital s}-wave amplitudes are dominated by the 1/2{sup {minus}} baryon resonances. Special attention is paid to the parity-violating 1/2{sup {minus}}-1/2{sup +} baryon matrix elements, which are evaluated using the MIT bag model. For definiteness, we compute the {alpha} asymmetry parameter and the branching ratios for the decay modes {Lambda}{sub {ital c}}{sup +}{r arrow}{ital p{bar K}}{sup 0}({ital {bar K}}{sup *0}), {Lambda}{pi}{sup +}({rho}{sup +}), {Sigma}{sup 0}{pi}{sup +}({rho}{sup +}), {Sigma}{sup +}{pi}{sup 0}({rho}{sup 0}), {ital p}{phi}, and find a good agreement with experiment. We conclude that (i) there is no color suppression in {Lambda}{sub {ital c}}{sup +}{r arrow}{ital p{bar K}}{sup 0}({ital {bar K}}{sup *0}) and {ital p}{phi}, (ii) nonspectator contributions are in general smaller than the factorizable ones for the decay modes which receive contributions from the factorizable diagram, and (iii) the predicted branching ratios will be too small if the wave functions of the heavy-quark bag model are employed. A comparison of our work with current algebra and other theoretical calculations is made.

• OSTI ID: 7287000
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 46:3; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662360* -- Decays of Baryons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BAG MODEL
BARYONS
BOSONS
BRANCHING RATIO
CHARM PARTICLES
CHARMED BARYONS
COMPOSITE MODELS
DECAY
ELEMENTARY PARTICLES
EXTENDED PARTICLE MODEL
FERMIONS
HADRONS
HYPERONS
INVARIANCE PRINCIPLES
LAMBDA BARYONS
LAMBDA C PLUS BARYONS
LAMBDA PARTICLES
MANY-BODY PROBLEM
MATHEMATICAL MODELS
MATRIX ELEMENTS
MESONS
NUCLEONS
P INVARIANCE
PARTIAL WAVES
PARTICLE DECAY
PARTICLE MODELS
PARTICLE PRODUCTION
PIONS
PIONS NEUTRAL
PIONS PLUS
PROTONS
PSEUDOSCALAR MESONS
QUARK MODEL
S WAVES
SIGMA BARYONS
SIGMA NEUTRAL PARTICLES
SIGMA PARTICLES
SIGMA PLUS PARTICLES
STRANGE PARTICLES
TWO-BODY PROBLEM
WEAK HADRONIC DECAY
WEAK PARTICLE DECAY