Sigma/Glueball Decay of D${}^{+}$ and D${}_s^{+}$

Abstract

Recently the D${}^{+}$ charm meson was observed to have a clear branching ratio into the low energy $\pi -\pi$ sigma resonance, while this channel was not detected in the D${}_s^{+}$ decay. It is shown that this is consistent with the standard treatment of exclusive charm meson decays and a proposed glueball/sigma picture.

typos corrected