Study on pure annihilation type <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>V</mml:mi><mml:mi>γ</mml:mi></mml:math> decays

On 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....

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...

Pure Leptonic Radiative Decays B ± , D s → ` νγ and the Annihilation Graph

Renormalons in Electromagnetic Annihilation Decays of Quarkonium

We study the large-order asymptotic behavior of the perturbation series for short-distance coefficients in the NRQCD factorization formulas for the decays J/ψ → e+e− and ηc → γγ. The short-distance coefficients of the leading matrix elements are calculated to all orders in the large-Nf limit. We find that there is a universal Borel resummable renormalon associated with the cancellation of the C...

Pure Leptonic Radiative Decays B

Pure leptonic radiative decays of heavy-light mesons are calculated using a very simple non-relativistic model. Dominant contribution originates from photon emission from light initial quark. We find BR(B ± → ℓνγ) ∼ 3.5 × 10 −6 and BR(D s → ℓνγ) ∼ 1.7 × 10 −4. The importance of these reactions to clarify the dynamics of the annihilation graph is emphasized.