Measurement of the e+e−→Ks0K±π∓π0 and Ks0K±π∓η cross sections using initial-state radiation

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Abstract

The processes ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}_{S}^{0}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ensuremath{\mp}}{\ensuremath{\pi}}^{0}$ and ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}_{S}^{0}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ensuremath{\mp}}\ensuremath{\eta}$ are studied over a continuum of energies from threshold to 4 GeV with the initial-state photon radiation method. Using $454\text{ }\text{ }{\text{fb}}^{\ensuremath{-}1}$ of data collected with the BABAR detector at the SLAC PEP-II storage ring, the first measurements of the cross sections for these processes are obtained. The intermediate resonance structures from ${K}^{*0}(K\ensuremath{\pi}{)}^{0}$, ${K}^{*}(892{)}^{\ifmmode\pm\else\textpm\fi{}}(K\ensuremath{\pi}{)}^{\ensuremath{\mp}}$, and ${K}_{S}^{0}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\rho}}^{\ensuremath{\mp}}$ are studied. The $J/\ensuremath{\psi}$ is observed in all of these channels, and corresponding branching fractions are measured.

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