Search for Supernarrow Dibaryons in pd-Interaction

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  • 5 April 1999
Abstract
The reaction pd-->pX at 305 MeV is studied with aim to search for supernarrow dibaryons a decay of which into two nucleons suppressed by the Pauli principle. The experiment was carried out at Moscow Meson Factory using the spectrometer TAMS which detected the proton spectator in coincidence with another charged particle (either p or d) from a decay of X. A detection of the second charged particle at angles closed to an emission angle of the particle X with the mass M allows to suppress essentially a contribution of background processes and to increase a relative contribution from a possible production of the dibaryon under consideration. Narrow structures in missing mass spectra at 1905 and 1924 MeV with the statistical significance of ~4.5 S.D. have been observed. Widths of both peaks are smaller than the experimental resolution (3 MeV). A comparison of the obtained data with the theoretical predictions leads to a conclusion that most likely the found structure at 1905 MeV corresponds to the supernarrow dibaryon with the isotopic spin equal to 1. The possible origin of the structure at 1924 MeV is also discussed.

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