Semi-leptonic $D_s^+$(1968) decays as a scalar meson probe
  The unusual multiplet structures associated with the light spin zero mesons have recently attracted a good deal of theoretical attention. Here we discuss some aspects associated with the possibility of getting new experimental information on this topic from semi-leptonic decays of heavy charged mesons into an isosinglet scalar or pseudoscalar plus leptons. 
Amir H. Fariborz, Renata Jora, Joseph Schechter and M. Naeem Shahid
hep-ph