Amplitude analysis and branching fraction measurement of Ds+→K+K−π+
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Abstract
We report an amplitude analysis and branching fraction measurement of ${D}_{s}^{+}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ decay using a data sample of $3.19\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ recorded with BESIII detector at a center-of-mass energy of 4.178 GeV. We perform a model-independent partial wave analysis in the low ${K}^{+}{K}^{\ensuremath{-}}$ mass region to determine the ${K}^{+}{K}^{\ensuremath{-}}$ S-wave line shape, followed by an amplitude analysis of our very pure high-statistics sample. With the detection efficiency based on the amplitude analysis results, the absolute branching fraction is measured to be $\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+})=(5.47\ifmmode\pm\else\textpm\fi{}0.0{8}_{\mathrm{stat}}\ifmmode\pm\else\textpm\fi{}0.1{3}_{\mathrm{sys}})%$.
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