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Measurement of the branching fractions of D_(s)⁺rightarrow η'X and D_(s)⁺rightarrow η'rho⁺ in e^+e^-to D^+_(s)D^-_(s)
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arxiv 1506.08952 v2 pith:HCYM5AUL submitted 2015-06-30 hep-ex
Measurement of the branching fractions of D_(s)⁺rightarrow η'X and D_(s)⁺rightarrow η'rho⁺ in e^+e^-to D^+_(s)D^-_(s)
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We study $D_{s}^{+}$ decays to final states involving the $\eta'$ with a 482$\,$pb$^{-1}$ data sample collected at $\sqrt{s}$ = 4.009$\,$GeV with the \mbox{BESIII} detector at the BEPCII collider. We measure the branching fractions $\mathcal{B}(D^+_{s}\rightarrow \eta'X)$ = (8.8$\pm$1.8$\pm$0.5)$\%$ and $\mathcal{B}(D_{s}^{+}\rightarrow \eta'\rho^{+})$ = ($5.8\pm1.4\pm0.4$)$\%$ where the first uncertainty is statistical and the second is systematic. In addition, we estimate an upper limit on the non-resonant branching ratio $\mathcal{B}(D_{s}^{+}\rightarrow \eta'\pi^+\pi^0)<5.1\%$ at the 90$\%$ confidence level. Our results are consistent with CLEO's recent measurements and help to resolve the disagreement between the theoretical prediction and CLEO's previous measurement of $\mathcal{B}(D_{s}^{+}\rightarrow \eta'\rho^{+})$.
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