Probing the elusive $\kappa /K_0^{\ast }(700)$ resonance in semileptonic $D$ decays

Yu-Kuo Hsiao, Yan-Li Wang, Wen-Juan Wei

The $\kappa /K_0^{\ast }(700)$ meson remains the most elusive among the light scalar resonances, with its presence in weak decays obscured by limited precision in branching fraction measuremen…