Light resonances in Ks K pi and eta pi pi final states in gamma gamma collisions at LEP

Details Light resonances in Ks K pi and eta pi pi final states in gamma gamma collisions at LEP Light resonances in Ks K pi and eta pi pi final states in gamma gamma collisions at LEP

2000-11-10

arxiv.org/abs/hep-ex/0011035v1

Phys.Lett.B501:1-11,2001

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1016/S0370-2693(01)00102-2

The e+e- -> e+e- Ks K+- pi-+ e+e- -> e+e- eta pi+ pi- and 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 Ks K+- pi-+ final state shows an enhancement around 1470MeV, 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)->KK pi)= 212 +/- 50(stat) +/- 23(sys)eV. Clear evidence is also obtained for the formation of the axial vector mesons f1(1420) and f1(1285). In the eta pi+ pi- channel the f1(1285) is observed, and upper limits for the formation of eta(1440) and eta(1295) are obtained.

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