منابع مشابه
Radiative Weak Annihilation Decays
A class of meson decay modes sensitive to only one quark topology at leading GF order (annihilation of valence quarks through a W ) is described. No experimental observations, nor even upper limits, have been reported for these decays. This work presents a simpleminded (order-of-magnitude) calculation of their branching fractions, and compares to results of previous calculations where available...
متن کاملOn Radiative Weak Annihilation Decays
We discuss a little-studied class of weak decay modes sensitive to only one quark topology at leading order in GF : M → mγ, where M,m are mesons with completely distinct flavor quantum numbers. Specifically, they proceed via the annihilation of the valence quarks through a W and the emission of a single hard photon, and thus provide a clear separation between CKM and strong interaction physics....
متن کاملWeak Radiative Hyperon Decays
It is shown that an alternative form of the parity-nonconserving (PNC) transition electromagnetic current resolves partly a puzzle with the Hara theorem. New formulation of it has allowed PNC weak radiative hyperon transitions of the charged hyperons Σ+ ⇒ p + γ and Ξ ⇒ Σ + γ revealing hitherto unseen transition toroid dipole moment.
متن کاملRadiative weak decays of charm mesons.
We address Standard Model predictions for flavor-changing radiative transitions of the pseudoscalar charm mesons. Short-distance contributions in D radiative transitions are contrasted with those in B decays. A full analysis is presented of the c → u+ γ electromagnetic penguin amplitude with QCD radiative corrections included. Given the importance of long-range effects for the charm sector, spe...
متن کامل− φ MIXING AND WEAK ANNIHILATION IN D s DECAYS
The mixing between nonstrange and strange quark wavefunctions in the ω and φ mesons leads to a small predicted branching ratio B(D+ s → ωeνe) = O(10−4)(δ/3.34◦)2, where δ is the mixing angle. The value δ = −3.34◦ is obtained in a mass-independent analysis, while a mass-dependent analysis gives δ = −0.45◦ at m(ω) and −4.64◦ at m(φ). Measurement of this branching ratio thus can tell whether the d...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2000
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.61.033004