Search for the decay $D^+_{s}\to\omega e^+\nu$

TL;DR

This study searches for the rare decay $D^+_{s} o ext{omega} e^+ u$ to explore its quark structure and mixing models, but finds no evidence and sets an upper limit on its branching fraction.

Contribution

First experimental search for the decay $D^+_{s} o ext{omega} e^+ u$, testing four-quark content and mixing models with new upper limit constraints.

Findings

No evidence of the decay was observed.

An upper limit on the branching fraction was set at 0.20%.

Results constrain theoretical models of $D^+_{s}$ decays.

Abstract

We present the first search for the decay $D^+_{s}\to \omega e^{+}\nu$ to test the four-quark content of the $D^+_{s}$ and the $\omega$-$\phi$ 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\omega e^+\nu)<$0.20% at the 90% confidence level.