Weak Gamma Decays and the Nonleptonic Weak Hamiltonian
نویسندگان
چکیده
منابع مشابه
Nonleptonic Weak Decays of Bottom Baryons
Cabibbo-allowed two-body hadronic weak decays of bottom baryons are analyzed. Contrary to the charmed baryon sector, many channels of bottom baryon decays proceed only through the external or internal W -emission diagrams. Moreover, W -exchange is likely to be suppressed in the bottom baryon sector. Consequently, the factorization approach suffices to describe most of the Cabibbo-allowed bottom...
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A previous analysis of two-body Cabibbo allowed nonleptonic decays of D mesons and of Cabibbo allowed and first-forbidden decays of D and D s has been adjourned using more recent experimental data and extended to the Cabibbo forbidden decays of D. Annihilation and W-exchange contributions as well as final state interaction effects (assumed to be dominated by nearby resonances) have been include...
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These lectures describe in detail the effective Hamiltonians for weak decays of mesons constructed by means of the operator product expansion and the renormalization group method. We calculate Wilson coeffcients of local operators, discuss mixing of operators under renormalization, the anomalous dimensions of operators and anomalous dimension matrices. We elaborate on the renormalzation scheme ...
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Cabibbo-allowed nonleptonic weak decays of charmed baryons Λ + c , Ξ 0A c , Ξ +A c and Ω 0 c into an octet baryon and a pseudoscalar meson are analyzed. The nonfactorizable contributions are evaluated under pole approximation, and it turns out that the s-wave amplitudes are dominated by the low-lying 2 − resonances, while pwave ones governed by the ground-state 2 + poles. The MIT bag model is e...
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Nonfactorizable contributions to exclusive two-body nonleptonic weak decays of heavy mesons arising from color octet currents, characterized by the parameter r2, are extracted from the data. It is found that r2 is equal to ∼ −0.67 , −(0.9 ∼ 1.1), − (1.2 ∼ 1.3), ∼ 0.36 respectively for D → K̄π, K̄π, K̄ρ, B̄ → Dπ decays. As expected, soft-gluon effects become stronger when the decay particles are les...
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics
سال: 1980
ISSN: 0033-068X,1347-4081
DOI: 10.1143/ptp.64.2158