Search for the decay $D_s^{+}\to a_0(980{)}^0{e}^{+}\hat{I}{½}_e$

Abstract

Using 6.32 fb${}^{-1}$ of electron-positron collision data recorded by the BESIII detector at center-of-mass energies between 4.178 and 4.226~GeV, we present the first search for the decay $D_s^{+}\to a_0(980{)}^0{e}^{+}\hat{I}{½}_e,a_0(980{)}^0\to \ddot{I}{€}^0\hat{I}\cdot$, which could proceed via $a_0(980)$-$f_0(980)$ mixing. No significant signal is observed. An upper limit of $1.2\times 10^{-4}$ at the $90\%$ confidence level is set on the product of the branching fractions of $D_s^{+}\to a_0(980{)}^0{e}^{+}\hat{I}{½}_e$ and $a_0(980{)}^0\to \ddot{I}{€}^0\hat{I}\cdot$ decays.

9 pages, 4 figures