The Search for eta(1440) --> K⁰ₛ Kᵖm πᵐp in Two-Photon Fusion at CLEO

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We analyze 13.8 fb⁻¹ of the integrated e+e- luminosity collected at 10.6 GeV center-of-mass energy with the CLEO II and CLEO II.V detectors to study exclusive two-photon production of hadrons with masses below 1.7 GeV/c² decaying into the K⁰ₛ K± π∓ final state. We observe two statistically significant enhancements in the η(1440) mass region. These enhancements have large transverse momentum which rules them out as being due to pseudoscalar resonances but is consistent with the production of axial-vector mesons. We use tagged two-photon events to study the properties of the observed enhancements and associate them with the production of f₁(1285) and f₁(1420). Our non-observation of η(1440) is inconsistent by more than two standard deviations with the first observation of this resonance in two-photon collisions by the L3 experiment. We present our estimates for 90% confidence level upper limits on the products of two-photon partial widths of pseudoscalar hadrons and their branching fractions into K⁰ₛ(π+π-)K±π∓.