Study of resonance formation in the mass region 1400-MeV to 1500-MeV through the reaction gamma gamma ---> K0(S) K+- pi-+.

L3 COLL., P. ACHARD , M.T.DOVA ET AL

JOURNAL OF HIGH ENERGY PHYSICS - (Online)

Año: 2007 vol. 0703 p. 18 - 100

1029-8479

The K0SK±π final state in two-photon collisions is studied with the L3 detector at LEP at e+e- centre-of-mass energies from 183 to 209 GeV with an integrated luminosity of 664.6 pb-1. The η(1475) and f1(1420) mesons are observed and their contribution is separated by measuring the formation rates as a function of the photon virtuality Q2. The η(1475) is found to be dominant for Q2 ≤ 0.01GeV2 and its two-photon width is measured to be 0.23±0.05 (stat.) ±0.05 (sys.) keV. At higher Q2, the f1(1420) is formed and decays to K(892)K. The γγ coupling and form factor parameters of this state are measured to be Γγγ = 3.2±0.6 (stat.) ±0.7 (sys.) keV and Λ1 = 926±72 (stat.) ±32 (sys.) MeV, respectively.