Study of a KS0KS0 threshold enhancement observed in the final states at 700 – 760 MeV/c

An analysis of the K 0 K 0 system at threshold produced in the final states p p → K S 0 K S 0 ( n π) at 700–760 MeV/c, is presented. A simultaneous fit to the ππ phase shifts and inelasticities and to the KS0KS0 effective-mass distributions using parametrizations which take into account the analytical and unitarity properties of the I = 0 S-wave amplitudes is performed. The behaviour of the eigenphases and the unphysical Riemann sheet structure for different solutions is studied.