A reanalysis of D meson decay data extracts a D-to-kappa form factor that assigns most of the s-wave rate to the kappa and matches the tetraquark prediction.
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Probing the elusive $\kappa/K_0^*(700)$ resonance in semileptonic $D$ decays
A reanalysis of D meson decay data extracts a D-to-kappa form factor that assigns most of the s-wave rate to the kappa and matches the tetraquark prediction.