Amplitude analysis of theD+→KS0π+π0Dalitz plot
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Abstract
We perform an analysis of the ${D}^{+}\ensuremath{\rightarrow}{K}_{S}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}$ Dalitz plot using a data set of $2.92\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ collisions at the $\ensuremath{\psi}(3770)$ mass accumulated by the BESIII experiment, in which 166694 candidate events are selected with a background of 15.1%. The Dalitz plot is found to be well represented by a combination of six quasi-two-body decay channels [${K}_{S}^{0}{\ensuremath{\rho}}^{+}$, ${K}_{S}^{0}\ensuremath{\rho}(1450{)}^{+}$, ${\overline{K}}^{*0}{\ensuremath{\pi}}^{+}$, ${\overline{K}}_{0}(1430{)}^{0}{\ensuremath{\pi}}^{+}$, $\overline{K}(1680{)}^{0}{\ensuremath{\pi}}^{+}$, ${\overline{\ensuremath{\kappa}}}^{0}{\ensuremath{\pi}}^{+}$] plus a small nonresonant component. Using the fit fractions from this analysis, partial branching ratios are updated with higher precision than previous measurements.
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