Unitary Symmetry and Leptonic Decays

Leptonic and semi - leptonic B decays

We present results for the semi-leptonic and leptonic decays of B mesons. These non-perturbative matrix elements are important for constraining the CKM matrix. Results are presented for the pseudoscalar and vector decay constants, as well as flavour breaking ratios and heavy quark symmetry relations. We consider the chiral and momentum dependence of the semi-leptonic form factors of the decay B...

Radiative Leptonic Bc Decays

We analyze the radiative leptonic Bc decay mode: Bc → `νγ (` = e, μ) using a QCD-inspired constituent quark model. The prediction: B(Bc → `νγ) ' 3× 10−5 confirms that this channel is experimentally promising in view of the large number of Bc mesons which are expected to be produced at the future hadron facilities. E-mail address: [email protected] E-mail address: [email protected] Recen...

Charm Leptonic and Semileptonic Decays

The study of charmed meson decays are important for improving our knowledge of the Standard Model (SM). In particular, the study of leptonic and semileptonic decays allow us to measure the CKM matrix elements Vcs and Vcd to a high level of precision. Leptonic and semileptonic decays are also used to test theoretical predictions describing the strong interaction (QCD) in heavy quark systems. Cha...

Pion Leptonic Decays and Supersymmetry

We compute supersymmetric contributions to pion leptonic (πl2) decays in the Minimal Supersymmetric Standard Model (MSSM). When R-parity is conserved, the largest contributions to the ratio Re/μ ≡ Γ[π + → eνe(γ)]/Γ[π + → μνμ(γ)] arise from one-loop (V − A) ⊗ (V − A) corrections. These contributions can be potentially as large as the sensitivities of upcoming experiments; if measured, they would...

Radiative Non – Leptonic Kaon Decays