Measurement of the $e^{+}{e}^{-}\to K_S^0{K}^{\pm }{\pi }^{\mp }{\pi }^0$ and $K_S^0{K}^{\pm }{\pi }^{\mp }\eta$ cross sections using initial-state radiation

Abstract

The processes $e^{+}{e}^{-}\to K_S^0{K}^{\pm }{\pi }^{\mp }{\pi }^0$ and $e^{+}{e}^{-}\to K_S^0{K}^{\pm }{\pi }^{\mp }\eta$ are studied over a continuum of energies from threshold to 4 GeV with the initial-state photon radiation method. Using 454 fb${}^{-1}$ 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 $K^{\ast 0}(K\pi {)}^0$, $K^{\ast }(892{)}^{\pm }(K\pi {)}^{\mp }$ and $K_S^0{K}^{\pm }{\rho }^{\mp }$ are studied. The $J/\psi$ is observed in all of these channels, and corresponding branching fractions are measured.

19 pages, 38 figures