By measuring 121 000 2-prong interactions on the Oxford PEPR, we obtained 9 543 events of the type K − p → K − π + n. The cuts to improve the quality of the data and to reduce ambiguities with other final states are described in detail. Strong signals corresponding to the final states K ∗o (890)n and K ∗o (1420)n are observed. The masses and widths of these resonances are determined.
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