Investigations of the weak decays of DB¯ molecules

Abstract

The decays of exotic states discovered experimentally always proceed via the strong and electromagnetic interactions. Recently, a tetraquark state with the quark content bcq¯q¯ was predicted by lattice QCD simulations. It is below the mass threshold of DB¯, which can only decay via the weak interaction. In this work, based on the decay mechanism of Tcc as a DD* molecule, we propose that the decays of the bcq¯q¯ tertaquark state as a DB¯ molecule proceed via the Cabibbo-favored weak decays of the B¯ or D meson, accompanied by the tree-level decay modes and the triangle decay modes. Our results indicate that the branching fraction of the DB¯ molecule decaying into π+K−B¯0 is sizable, which is a good channel to observe the DB¯ molecule in future experiments. Published by the American Physical Society 2024