Relative size of SU(3) symmetry-breaking effects and penguin diagrams

Journal Article · Mon Apr 26 00:00:00 EDT 1993 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.70.2533· OSTI ID:6498213

Ward, B F.L. ^[1]

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1. Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200 (United States) Stanford Linear Accelerator Center P.O. Box 4349, Stanford, California 94309 (United States) TH Division, CERN, Geneva 23 (Switzerland)

We use the data on the decays [ital D][r arrow][pi][pi] and [ital D][r arrow][ital KK] as a test vehicle for evaluating the effects of penguin diagrams in exclusive heavy meson decays. Evaluating [Gamma]([ital D][r arrow][pi][sup +][pi][sup [minus]]) and [Gamma]([ital D][r arrow][ital K][sup +][ital K[minus]]), we find good agreement between our theoretical SU(2[ital L])[times]U(1)[times]SU(3)[sup [ital c]]-based predictions and observation. Contributions from penguin diagrams are small and SU(3) flavor breaking effects account for the large value of [Gamma]([ital D][r arrow][ital K][sup +][ital K[minus]])/[Gamma]([ital D][r arrow][pi][sup +][pi][sup [minus]]). Implications for [ital B] decays are discssed briefly.

• DOE Contract Number: FG05-91ER40627; AC03-76SF00515
• OSTI ID: 6498213
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 70:17; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

662230 -- Quantum Chromodynamics-- (1992-)
662350* -- Decays of Mesons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
CHARM PARTICLES
CHARMED MESONS
D MESONS
D NEUTRAL MESONS
DECAY
ELEMENTARY PARTICLES
EXCLUSIVE INTERACTIONS
FIELD THEORIES
HADRONS
INTERACTIONS
KAONS
KAONS MINUS
KAONS PLUS
LIE GROUPS
MESONS
PAIR PRODUCTION
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PERTURBATION THEORY
PIONS
PIONS MINUS
PIONS PLUS
PSEUDOSCALAR MESONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
STRANGE MESONS
STRANGE PARTICLES
SU GROUPS
SU-3 GROUPS
SYMMETRY BREAKING
SYMMETRY GROUPS
WEAK HADRONIC DECAY
WEAK PARTICLE DECAY