Light resonances in KS OK±π∓ and ηπ+π- final states in γγ collisions at LEP

Physics Letters B(2001)

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摘要
The $e^+ e^- \\rightarrow e^+ e^- K^{0}_{s} K^{\\pm} pi^{\\mp}$ and $e^+ e^- \\rightarrow e^+ e^- \\eta \\pi^{+} \\pi^{-}$ final states are studied with the L3 detector at LEP using data collected at centre-of-mass energies from 183 GeV up to 202 GeV. The mass spectrum of the $K^{0}_{s} K^{\\pm} \\pi^{\\mp}$ final state shows an enhancement around 1470 MeV, which is identified with the pseudoscalar meson $\\eta(1440)$. This state is observed in $\\gamma \\gamma$ collisions for the first time and its two-photon width is measured to be $\\Gamma_{\\gamma\\gamma}(\\eta(1440)) x BR(\\eta(1440) \\rightarrow K\\bar{K}\\pi = 212 \\pm 50 (stat) \\pm 23 (sys)$ eV. Clear evidence is also obtained for the formation of the axial vector mesons $f_1$(1420) and $f_1$(1285). In the $\\eta \\pi^{+} \\pi^{-}$ channel the $f_1$ (1285)} is observed, and upper limits for the formation of $\\eta(1440)$ and $\\eta(1295)$ are obtained.
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