Search for the decay $D_s^{+}\to \ddot{I}‰e^{+}\hat{I}½$

Abstract

We present the first search for the decay $D_s^{+}\to \ddot{I}‰e^{+}\hat{I}½$ to test the four-quark content of the $D_s^{+}$ and the $\ddot{I}‰$-$\ddot{I}•$ mixing model for this decay. We use 586 ${\mathrm{pb}}^{-1}$ of $e^{+}{e}^{-}$ collision data collected at a center-of-mass energy of 4170 MeV. We find no evidence of a signal, and set an upper limit on the branching fraction of $\mathcal{B}(D_s^{+}\to \ddot{I}‰e^{+}\hat{I}½)<$0.20% at the 90% confidence level.

18 pages, 9 figures