Estimation of coupling constants for D-meson, charmed, and light baryons in effective Lagrangian approach and quark model

Abstract

We estimate coupling constants for effective Lagrangians of D-meson, charmed, and light baryons from charmed baryon decay processes. First, we calculate decay widths for the processes Λc→ D∗N, Λc→ DN, Σc→ DN , Σc→ DΔ, and Σc→ D∗Δ in effective Lagrangian method and quark model picture with 3P model. By employing the coupling constants for D∗ΛcN interaction from several literatures, the strength parameter λ for 3P quark model is fixed in the decay process Λc→ D∗N. Then, the coupling constants for the effective Lagrangians of DΛcN, DΣcN, DΣcΔ, and D∗ΣcΔ interactions are estimated in the decay channels Λc→ DN, Σc→ DN, Σc→ DΔ, and Σc→ D∗Δ, respectively. Then, the coupling constants for DΣcN, D∗ΣcN, and D∗Σc∗Δ interactions are calculated from heavy-quark and large-Nc sum rules. The coupling constants from this study will be useful for further studies of charm hadrons. © 2023, The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature.