Abstract
Based on the predictions of the relevant form factors from the covariant light-front quark model, we show the branching fractions for the D (D_s) rightarrow (P,,S,,V,,A),ell nu _ell (ell =e or mu ) decays, where P denotes the pseudoscalar meson, S the scalar meson with a mass above 1 GeV, V the vector meson and A the axial-vector one. Comparison with the available experimental results are made, and we find an excellent agreement. The predictions for other decay modes can be tested in a charm factory, e.g., the BESIII detector. The future measurements will definitely further enrich our knowledge of the hadronic transition form factors as well as the inner structure of the even-parity mesons (S and A).
Highlights
The Cabibbo–Kobayashi–Maskawa (CKM) matrix describing the quark flavor mixing [1,2] has been a key skeleton of the Standard Model (SM)
The covariant light-front model is a powerful tool for predicting the electroweak decay form factors
The extension to the Ds+ decay has been done in Ref. [13], where the parameters β in the light-front wave functions were constrained by the available experimental information as well as the lattice results
Summary
The Cabibbo–Kobayashi–Maskawa (CKM) matrix describing the quark flavor mixing [1,2] has been a key skeleton of the Standard Model (SM). [7], Cheng, Chua and Hwang have systematically studied the decay constants and form factors for the S- and P-wave mesons in 2003 [12], while an update was done in Ref. To calculate the branching fractions, we have considered the underlying structure of the final-state meson, e.g., the mixing angles for axial-vector f1, h1 and K1 mesons.
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