Search for supernarrow dibaryons inpdinteractions

Abstract

The reaction $p\stackrel{\ensuremath{\rightarrow}}{d}\mathrm{pX}$ at 305 MeV is studied with the aim of searching for supernarrow dibaryons, the decay of which into two nucleons is forbidden by the Pauli exclusion principle. The experiment was carried out at the Moscow Meson Factory using the spectrometer TAMS, which detected the proton spectator and another charged particle (either p or $d)$ from the decay of X. Narrow peaks in missing mass spectra have been observed at 1905 and 1924 MeV. Comparison of the obtained data with theoretical predictions leads to the conclusion that the peak found at 1905 MeV most likely corresponds to a supernarrow dibaryon with isotopic spin equal to 1. The possible origin of the peak at 1924 MeV is also discussed.