Relativistic flux-tube model predictions from charmed mesons to double-charmed baryons

Utilizing comprehensive experimental data on charmed mesons, we systematically investigate masses of the higher radial and orbital excitations of the D and D s meson families using the relativistic flux-tube model. Our study employs mass splitting induced by spin-dependent interactions within the j-j coupling scheme. Our predicted masses align well with the experimental measurements for the well-established D and D s states. However, anomalous resonances such as D s 0 ( 2317 ) and D s 1 ( 2460 ) do not align with conventional meson states within our theoretical framework. We also study strong decays using an effective Lagrangian formalism that combines heavy-quark symmetry with chiral dynamics, focusing on two-body modes into a charmed meson plus a light pseudoscalar ( π , K , η ). Using the combined constraints from masses and decay patterns we propose spectroscopic assignments for several recently observed resonances, including D 2 ( 2740 ) 0 , D 3 * ( 2750 ) , D 0 ( 2550 ) 0 , D 1 * ( 2600 ) 0 , D 1 * ( 2760 ) 0 , D J * ( 3000 ) , D J ( 3000 ) , D 2 * ( 3000 ) , D s 1 * ( 2860 ) ± , and D s 3 * ( 2860 ) ± . We also identify D s J ( 3040 ) + as a 2 P <