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 phase...

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Veröffentlicht in:Phys. Rev. Lett.; (United States) 1988-03, Vol.60 (10), p.901-904
Hauptverfasser: Shypit, RL, Bugg, DV, Lee, DM, McNaughton, MW, Silbar, RR, Stewart, NM, Clough, AS, Hollas, CL, McNaughton, KH, Riley, P, Davis, CA
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Sprache:eng
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Zusammenfassung: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
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.60.901