Cabibbo-allowed nonleptonic weak decays of charmed baryons

Journal Article · Mon Nov 01 04:00:00 EST 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.48.4188· OSTI ID:5970305

Cheng, H ^[1]; Tseng, B ^[2]

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1. Institute of Physics, Academia Sinica, Taipei, Taiwan 11529 (Taiwan, Province of China) Institute for Theoretical Physics, State University of New York, Stony Brook, New York 11794 (United States)
2. Institute of Physics, Academia Sinica, Taipei, Taiwan 11529 (Taiwan, Province of China)

Cabibbo-allowed nonleptonic weak decays of charmed baryons [Lambda][sub [ital c]][sup +], [Xi][sub [ital c]][sup 0[ital A]], [Xi][sub [ital c]][sup +[ital A]], and [Omega][sub [ital c]][sup 0] into an octet baryon and a pseudoscalar meson are analyzed. The nonfactorizable contributions are evaluated under the pole approximation, and it turns out that the [ital s]-wave amplitudes are dominated by the low-lying 1/2[sup [minus]] resonances, while [ital p]-wave ones are governed by the ground state 1/2[sup +] poles. The MIT bag model is employed to calculate the coupling constants, form factors, and baryon matrix elements. Our conclusions are the following: (i) [ital s] waves are no longer dominated by commutator terms; the current-algebra method is not applicable to parity-violating amplitudes. (ii) Nonfactorizable [ital W]-exchange effects are generally important; they can be comparable to and sometimes even dominate over factorizable contributions, depending on the decay modes under consideration. (iii) The large-[ital N][sub [ital c]] approximation for factorizable amplitudes also works in the heavy baryon sector and it accounts for the color nonsuppression of [Lambda][sub [ital c]][sup +][r arrow][ital p[bar K]][sup 0] relative to [Lambda][sub [ital c]][sup +][r arrow][Lambda][pi][sup +]. (iv) A measurement of the decay rate and the sign of the [alpha] asymmetry parameter of certain proposed decay modes will help discern various models. (v) [ital p] waves are the dominant contributions to the decays [Lambda][sub [ital c]][sup +][r arrow][Xi][sup 0][ital K+] and [Xi][sub [ital c]][sup 0[ital A]][r arrow][Sigma][sup +][ital K[minus]], but they are subject to a large cancellation; this renders present theoretical predictions on these two channels unreliable.

• OSTI ID: 5970305
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 48:9; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662120 -- General Theory of Particles & Fields-- Symmetry
Conservation Laws
Currents & Their Properties-- (1992-)
662240 -- Models for Strong Interactions-- (1992-)
662360* -- Decays of Baryons-- (1992-)
662410 -- Properties of Baryons & Baryon Resonances-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BAG MODEL
BARYON OCTETS
BARYONS
BOSONS
CHARM PARTICLES
CHARMED BARYONS
COMPOSITE MODELS
COUPLING CONSTANTS
CURRENT ALGEBRA
DECAY
ELEMENTARY PARTICLES
EXTENDED PARTICLE MODEL
FERMIONS
FORM FACTORS
HADRONS
MATHEMATICAL MODELS
MATRIX ELEMENTS
MESONS
MULTIPLETS
PARTIAL WAVES
PARTICLE DECAY
PARTICLE MODELS
PARTICLE MULTIPLETS
PARTICLE PROPERTIES
PSEUDOSCALAR MESONS
QUARK MODEL
S WAVES
WEAK HADRONIC DECAY
WEAK PARTICLE DECAY