Nonleptonic weak decays of charmed baryons

Journal Article · Sat Aug 01 00:00:00 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), Vol. 46:3; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

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