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.
Using FD+→Sn = 0.47± 0.02 and FD+→Sns = 0.31± 0.02 [30], we obtain FD+→¯κ0 q¯q = 0.82± 0.05 and FD+→¯κ0 q2¯q2 = 0.36± 0.02
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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.