f1(1285) Formation in Two-Photon Collisions at LEP
Abstract
The eta pi+ pi- final state in two-photon collisions is studied with the L3 detector at LEP, at centre-of-mass energies from 183 to 209 GeV with an integrated luminosity of 664.6/pb. The f1(1285) meson is observed and the Q2 dependence of its production is compared to different form factor models. The gamma-gamma coupling parameter is found to be 3.5 +/- 0.6(stat.) +/- 0.5(sys.) keV. The branching fraction (f1(1285) -> a0 pi) / (f1(1285) -> eta pi pi) is also measured.
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