X0-η Mixing and Radiative Meson Decays

Radiative φ-meson decays and η-η′ mixing: a QCD sum rule analysis

The radiative transitions φ → ηγ and φ → η′γ are analysed using QCD sum-rules. At leading order in perturbative QCD, we obtain the results: B(φ → ηγ) = (1.15 ± 0.2) 10−2 and B(φ → η′γ) = (1.18 ± 0.4) 10−4, in very good agreement with existing experimental data. The related issue of η-η′ mixing is discussed and we give predictions for the η and η′ decay constants in the framework of a mixing sch...

Mixing of Η-η′ Mesons in J/ψ Decays into a Vector and a Pseudoscalar Meson

The octet-singlet mixing angle θP in the pseudoscalar meson nonet is deduced from the rich set of accurate data on J/ψ decays into a vector and a pseudoscalar meson. Corrections due to non-ideal ω-φ mixing have been included for the first time and turn out to be crucial to find θP = −16.9◦±1.7◦, which is appreciably less negative than previous results coming from similar analyses. The value of ...

Charm meson radiative decays

Combining heavy quark effective theory and the chiral Lagrangian approach we investigate D meson radiative decays. First, we reanalyse D∗ → Dγ decays using heavy quark spin symmetry, chiral symmetry Lagrangian, but including also the light vector mesons. Then, we calculate branching ratios D → V γ. We make some comments on the Cabbibo suppressed decays D → ρ/ωγ and the branching ratios of D → P...

Exclusive Radiative B Meson Decays

We have investigated exclusive, radiative B meson decays to charmless mesons (ρ, ω, φ, K(892), K 2 (1430)) in 9.7× 106 BB̄ decays accumulated with the CLEO detector. The B → K(892)γ branching fractions are determined to be B(B0 → K∗0(892)γ) = (4.55 +0.72 −0.68 ± 0.34)×10−5 and B(B+ → K∗+(892)γ) = (3.76 +0.89 −0.83 ± 0.28)×10−5. We have searched for CP asymmetry in B → K(892)γ decays and measure ...

Reexamining radiative decays of 1 − − quarkonium into η ′ and η