Abstract
Missing mass spectra from (p,d)X at GeV (°, 32°, and 40°) and GeV (° and 40°) have been measured. Missing mass spectra from pHe,d)X at GeV and ° have also been measured. The experiments have been carried out with a high missing mass resolution in order to detect possible narrow structures associated with B=2, T=1 quantum numbers. Such structures have been seen, with the following masses and widths: =2.240±0.005, (≊0.016±0.003) GeV, =2.192±0.003, (≊0.025±0.006) GeV, and =2.121±0.003, (≊0.025±0.002) GeV. A broad structure with mass close to ≊2.17 GeV, the mass of free N+Δ, and a width close to ≊0.1 GeV is observed. The observed peaks might be related to six-quark states.
- Received 27 March 1987
DOI:https://doi.org/10.1103/PhysRevC.36.1995
©1987 American Physical Society