Chiral Lagrangians for radiative decays of heavy hadrons

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

DOI:https://doi.org/10.1103/PhysRevD.47.1030· OSTI ID:6992857

Cheng, H; Cheung, C; Lin, G ^[1]; Lin, Y C ^[2]; Yan, T ^[3]; Yu, H ^[1]

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1. Institute of Physics, Academia Sinica, Taipei, Taiwan 11529 (Taiwan, Province of China)
2. Physics Department, National Central University, Chung-li, Taiwan 32054 (Taiwan, Province of China)
3. Institute of Physics, Academia Sinica, Taipei, Taiwan 11529 (Taiwan, Province of China) Floyd R. Newman Laboratory of Nuclear Studies, Cornell University, Ithaca, New York 14853 (United States)

The radiative decays of heavy mesons and heavy baryons are studied in a formalism which incorporates both heavy-quark symmetry and chiral symmetry. The chiral Lagrangians for the electromagnetic interactions of heavy hadrons consist of two pieces: one from gauging electromagnetically the strong-interaction chiral Lagrangian, and the other from the anomalous magnetic moment interactions of the heavy baryons and mesons. Because of the heavy-quark spin symmetry, the latter contains only one independent coupling constant in the meson sector and two in the baryon sector. These coupling constants only depend on the light quarks and can be calculated in the nonrelativistic quark model. However, the charmed quark is not heavy enough and the contribution from its magnetic moment must be included. Applications to the radiative decays [ital D][sup *][r arrow][ital D][gamma], [ital B][sup *][r arrow][ital B][gamma], [Xi][sub [ital c]][sup [prime]][r arrow][Xi][sub [ital c]][gamma], [Sigma][sub [ital c]][r arrow][Lambda][sub [ital c]][gamma], and [Sigma][sub [ital c]][r arrow][Lambda][sub [ital c]][pi][gamma] are given. Together with our previous results on the strong decay rates of [ital D][sup *][r arrow][ital D][pi] and [Sigma][sub [ital c]][r arrow][Lambda][sub [ital c]][pi], predictions are obtained for the total widths and branching ratios of [ital D][sup *] and [Sigma][sub [ital c]]. The decays [Sigma][sub [ital c]][sup +][r arrow][Lambda][sub [ital c]][sup +][pi][sup 0][gamma] and [Sigma][sub [ital c]][sup 0][r arrow][Lambda][sub [ital c]][sup +][pi][sup [minus]][gamma] are discussed to illustrate the important roles played by both heavy-quark symmetry and chiral symmetry.

• OSTI ID: 6992857
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 47:3; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662330 -- Photon & Charged-Lepton Interactions with Hadrons-- (1992)
662350* -- Decays of Mesons-- (1992-)
662360 -- Decays of Baryons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B MESONS
BARYONS
BASIC INTERACTIONS
BEAUTY PARTICLES
BOSONS
CHARM PARTICLES
CHARMED MESONS
CHIRAL SYMMETRY
COMPOSITE MODELS
COUPLING CONSTANTS
D MESONS
DECAY
DIAGRAMS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
FERMIONS
FEYNMAN DIAGRAM
FUNCTIONS
HADRONS
HYPERONS
INTERACTIONS
LAGRANGIAN FUNCTION
LAMBDA BARYONS
MAGNETIC MOMENTS
MASS
MASSLESS PARTICLES
MATHEMATICAL MODELS
MESONS
PARTICLE DECAY
PARTICLE MODELS
PHOTONS
PIONS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
QUARK MODEL
QUARKS
RADIATIVE DECAY
SIGMA BARYONS
STRANGE PARTICLES
SYMMETRY
XI BARYONS