Search for dibaryon resonances in hadron-nucleus interactions

Results that have been obtained in the analysis of the effective-mass M(2p) spectra of pairs of protons produced in ..pi../sup -12/C interactions at 4 and 40 GeV and in p /sup 20/Ne collisions at 300 GeV are presented. Narrow structural features have been observed in the M(2p) distributions that may be an evidence for the existence of resonances in the two-proton system.