Partial-wave analysis of the low-mass \overline {K^0 } \pi ^ + \pi ^ - system produced in the reaction{\rm K}^ - p \to \overline {K^0 } \pi ^ + \pi ^ - n at 3.95 and 14.3 GeV/c

A partial-wave analysis of the\(\overline {K^0 } \pi ^ + \pi ^ - \) system in the mass range\({\rm M}(\overline {K^0 } \pi ^ + \pi ^ - )< 1.6GeV\) is presented for data at 3.95 and 14.3 GeV/c. We find important contributions from theJP=0− and 1+ states, the unnatural spin-parity states accounting for more than 3/4 of the events at 3.95 GeV/c and for more than half at 14.3 GeV/c. Natural-parity exchange is dominant at both energies. A fit of the cross-sections of several states toσ∝Plab−n givesn about 2.0. The energy dependence of the cross-section for the production of the |2+D1+〉-state is found to be different in charge exchange and charge nonexchange reactions.