Cascade Resonance Production in Negative Kaon - Interaction at 5 GEV.

The reaction K('-)p(--->)K('+)(,slow)X('-) was studied for (XI)* production using Brookhaven National Laboratory's Multi-Particle Spectrometer. The slow transverse K('+) was identified by two brass/scintillator detectors that detected the stopping K('+) and its subsequent decay. The reaction takes place via baryon exchange. The system in recoil to the K('+) has strangeness -2. The mass of the X('-) was determined as a missing mass for about 3400 events. Of the eleven previously reported (XI) states, two are well established, two are in need of clarification, and the rest need confirmation. In this experiment no new resonances were found, but six previously reported (XI) states were observed: (XI)(1320), (XI)(1530), (XI)(1820), (XI)(2020), (XI)(2220), and the (XI)(2350). Two body cross sections were measured for these states and they range from 1.25 to 7.25 (mu)b. Other previously reported states were not observed up to the 1 (mu)b level and they are: (XI)(1630), (XI)(1680), (XI)(1940), and the (XI)(2120). No conclusions were drawn on the (XI)(2500).