Evidence against broad dibaryons

Spin-correlation parameters A/sub L//sub L/, A/sub S//sub L/, A/sub N//sub L/, A/sub N//sub 0/, A/sub S//sub 0/, A/sub L//sub 0/, and A/sub 0//sub L/ have been measured for the reaction pp..-->..np..pi../sup +/ at 492, 576, 643, 729, and 796 MeV. An isobar analysis determines magnitudes and phases of partial waves up to NN /sup 3/F/sub 3/. For the amplitude NN(/sup 1/D/sub 2/)..-->..N..delta..(/sup 5/S/sub 2/), the phase shows a strong threshold enhancement in the N..delta.. channel, dropping from 44.4/sup 0/ +- 4.4/sup 0/ at 492 MeV to 11.9/sup 0/ +- 1.9/sup 0/ at 796 MeV. Other phases show little activity. Broad dibaryons are conclusively ruled out in /sup 1/D/sub 2/, /sup 3/F/sub 3/, and /sup 3/P/sub 2/ in this energy range