Decay D→K(*)ℓ+νℓ in covariant quark model
AbstractWe study the leptonic and semileptonic D-meson decays (D→ℓ+νℓ and D→K(*)ℓ+νℓ) in the framework of covariant quark model with built-in infrared confinement. We compute the required form factors in the entire kinematical momentum transfer region. The calculated form factors are used to evaluate the branching fractions of these transitions. We determine the following ratios of the partial widths: Γ(D0→K-e+νe)/Γ(D+→K¯0e+νe)=1.02, Γ(D0→K-μ+νμ)/Γ(D+→K¯0μ+νμ)=0.99 and Γ(D+→K¯0μ+νμ)/Γ(D+→K¯0e+νe)=0.97 which are in close resemblance with the isospin invariance and experimental results.