Branching fractions of semileptonic $D$ and $D_s$ decays from the covariant light-front quark model

TL;DR

This paper predicts branching fractions for semileptonic D and D_s decays using a covariant light-front quark model, showing excellent agreement with existing data and providing testable predictions for future experiments.

Contribution

It introduces a comprehensive calculation of semileptonic decay branching fractions using the covariant light-front quark model, offering new predictions for unmeasured decay modes.

Findings

Predicted branching fractions agree well with experimental data.

Provided new decay mode predictions for future experimental testing.

Enhanced understanding of hadronic transition form factors and meson structures.

Abstract

Based on the predictions of the relevant form factors from the covariant light-front quark model, we show the branching fractions for the $D (D_s) \to (P,\,S,\,V,\,A)\,\ell\nu_\ell$ ($\ell=e$ 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 on the hadronic transition form factor as well as the inner structure of the even-parity mesons ($S$ and $A$).