D. Krupa et al., ANALYSIS OF PI-PI-SCATTERING WITH ALLOWANCE FOR THE K(K)BAR AND ETA-ETA-THRESHOLDS, Soviet journal of nuclear physics, 54(5), 1991, pp. 862-866
A procedure is proposed for taking into account the eight-sheeted stru
cture of the Riemann surface of a three-channel S matrix. The represen
tation of resonances on this surface is discussed. An analysis is made
of experimental data on the isoscalar s-wave pi-pi-scattering in a re
gion including the KKBAR and eta-eta-thresholds (0.7-1.6 GeV) for the
purpose of determining the resonance parameters.