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We study the reactions $\gamma d\to\pi\gamma NN$ with the aim to search forsix-quark states, the decay of which into two nucleons is forbidden by thePauli exclusion principle. These states with the masses $M<2m_N+m_{\pi}$ shouldmainly decay by emitting a photon. This is a new class of metastable six-quarkstates with the decay widths $<< 1$keV. The recent experiment at Proton LinearAccelerator of INR (Moscow) suggests a possibility of the existence of suchstates with masses 1904, 1926, and 1942 MeV. The proposed experiment at MAMI-Ccould provide an unique opportunity to observe such dibaryon states in massregion up to 2000 MeV and determine their masses and quantum numbers.

Search for narrow six-quark states in the reactions $\gamma d\to \pi\gamma nn$