Abstract
The f inal states K Pir*jt 3t° and K Nir*ir were studied in K P inter actions at 4.6 and 5*0 BeV/c. The data were prepared from 28000 pictures at each momentum taken in the 80 bubble chamber at Brookhaven National Laboratory. The cross sections for production of the f inal state K Ptc*n Jt° are >7^ .09 mb and .93 .12 mb, and for the f inal state K NJC* j t*t : .42 .06 mb and .39 .07 mb at 4.6 and $.0 BeV/c, respectively. The effective mass distr ibutions were studied by combining the data from both momenta. The effective cross sections for the combined data are .83 .12 mb for the K f inal state and .41 . 07 mb for the K st j t f inal state. The combined data consists of 701 events. The resonance production includes K ° (890); 29 4%, (1236); 17 3% and (I236): 7,0 2.0%. There is, in addit ion, evidence for an enhancement at 96O MeV/c^ in the jr '-strt mass spectrum of magnitude 6 2%. lower l imit on double resonance production is estimated to be 5% with some evidence for A 3« 7 1 « 7%' No resonance observed in this f inal state could be understood exclusively on the basis of a single part icle exchange process. The combined K Pn'^'xc data consists of I3O5 events. The resonance production includes (890); 19 3%, K (890); 7«2 1.7%, ( 1236); 15 3%, (1236); 8 3%, ° (1236); < 2% u)° (784): 14.5 3%, Ti (548): 3.3 1.3%, Al° (I080); 10.5 3%, A2° (1300); 3 1.5%, P *(760); 9 2.5% and p (76O): 5'5 2%. spin analysis of the Al° (IO8O) indicates an unnatural spin and parity assignment with l* preferred. lower l imit
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