Charmed-meson production and decay using vector-meson dominance and dual-amplitude analysis. [SU(4) symmetry]

Journal Article · Tue Mar 01 00:00:00 EST 1977 · Phys. Rev., D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.15.1282· OSTI ID:7322397

McKay, D W; Young, B

Two prominent features of the data on the charmed-meson--type signal observed at SPEAR are discussed. The predominance of the DD-bar* production and the lack of a pronounced K* production signal in D/sup +/ ..-->.. K/sup -/..pi../sup +/..pi../sup +/ are explained by using ideas borrowed from analysis of the production and decay of low-mass, uncharmed mesons. The e/sup +/e/sup -/ production cross sections for charmed-meson pairs are treated by a simple vector-meson-dominance picture, and approximate SU(4) symmetry for PPV and PVV couplings leads to a factor-25 enhancement of the DD-bar* channel compared to the DD-bar channel. The nonleptonic decay D/sup +/ ..-->.. K/sup -/..pi../sup +/..pi../sup +/ is represented by a model with a ..delta..S = ..delta..C effective weak ''mass-mixing'' Hamiltonian, with pole dominance of the external legs, and with Veneziano-amplitude representation of the meson-meson off-shell scattering amplitude. There is no pronounced K* signal in this model, a result which is independent of the choice of satellite terms in the Veneziano amplitude. The potential usefulness of dual-amplitude fits of three-body nonleptonic charmed-meson decays in studies of meson-meson interactions in the 1--2-GeV range is emphasized. The striking charmed-meson mass relations derived from the single-term Veneziano amplitude plus Adler PCAC (partial conservation of axial-vector current) condition (e.g., M D-italic /sub asterisk/ = 2.017 +- 0.02 GeV is predicted with M/sub D/ = 1.87 +- 0.015 GeV as input) lend support to this kind of approach.

• Research Organization: Ames Laboratory: ERDA and Department of Physics, Iowa State University, Ames, Iowa 50011
• OSTI ID: 7322397
• Journal Information: Phys. Rev., D; (United States), Vol. 15:5
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHARM PARTICLES
DECAY
PAIR PRODUCTION
ELECTRON-POSITRON INTERACTIONS
ANNIHILATION
VECTOR MESONS
BRANCHING RATIO
COUPLING
CROSS SECTIONS
PHOTONS
SCATTERING AMPLITUDES
SU-4 GROUPS
VECTOR DOMINANCE MODEL
VENEZIANO MODEL
VIRTUAL PARTICLES
AMPLITUDES
BASIC INTERACTIONS
BOSONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
HADRONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LIE GROUPS
MASSLESS PARTICLES
MATHEMATICAL MODELS
MESON RESONANCES
MESONS
PARTICLE INTERACTIONS
PARTICLE MODELS
POSTULATED PARTICLES
RESONANCE PARTICLES
SU GROUPS
SYMMETRY GROUPS
645302* - High Energy Physics- Particle Invariance Principles & Symmetries- Applications to Electromagnetic & Weak Interactions- (-1987)