Nonleptonic weak decays of mesons
A unified view for nonleptonic decays of mesons is presented on the basis of a model introduced for interpreting the enhancement of D- and K-meson decay. We show that inclusive and exclusive nonleptonic decays of mesons can be described in a unified picture and the enhancements in inclusive decays are closely related to two-body decays (0/sup -/0/sup -/ decays). The model is applied to the decays of K, charmed, and B mesons and predicts the values (GAMMA(K/sup +/..--> pi../sup +/..pi../sup 0/))/sup -1/approx. =6.2 x 10/sup -8/ sec (expt. 5.9 x 10/sup -8/ sec), tau/sup +//tau/sup 0/approx. =3--6, tau/sup tsF//tau/sup 0/approx. =1.3--1.5, B(B/sup 0/..-->..e..nu..X)approx. =7--12%, B(B/sup -/..-->..e..nu..X)approx. =(10--12)%, where tau/sup 0/ (tau/sup +/,tau/sup tsF/) is the lifetime of the D/sup 0/ (D/sup +/,F) meson and B(A..-->..e..nu..X) stands for the semileptonic branching ratio. The large difference between the ratios, GAMMA(D/sup 0/..-->..K-bar/sup 0/..pi../sup 0/)/GAMMA(D/sup 0/..-->..K/sup -/..pi../sup +/) approx. =0.7/sup +0.7//sub -0.4/ and GAMMA(D/sup 0/..-->..K-bar/sup 0/rho/sup 0/)/GAMMA(D/sup 0/..-->..K/sup -/rho/sup +/) approx. =0.01/sup +0.10//sub -0.01/, is naturally understood as the difference between the s-wave decays and the p-wave decays. We also point out that the model can include many of the models proposed up to this point, e.g., W-exchange model, quark-number-conservation model, penguin diagram, etc. We comment that the ..delta..I = 1/2 rule for hyperon decays is easily understood in the model.
- Research Organization:
- Institute of Physics, University of Tsukuba, Ibaraki 305, Japan
- OSTI ID:
- 6313800
- Journal Information:
- Phys. Rev. D; (United States), Vol. 24:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHARMED MESON RESONANCES
WEAK HADRONIC DECAY
KAONS
BRANCHING RATIO
EXCLUSIVE INTERACTIONS
INCLUSIVE INTERACTIONS
LIFETIME
SU-3 GROUPS
SYMMETRY BREAKING
BOSONS
CHARM PARTICLES
DECAY
ELEMENTARY PARTICLES
HADRONS
INTERACTIONS
LIE GROUPS
MESON RESONANCES
MESONS
PARTICLE DECAY
PARTICLE INTERACTIONS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
RESONANCE PARTICLES
STRANGE PARTICLES
SU GROUPS
SYMMETRY GROUPS
WEAK PARTICLE DECAY
645203* - High Energy Physics- Particle Interactions & Properties-Theoretical- Weak Interactions & Properties