We perform a calculation of the interaction of the D D, D s Ds coupled channels and find two bound states, one coupling to D D and another one at higher energies coupling mostly to D + s D − s .We identify this latter state with the X 0 (3930) seen in the D + D − mass distribution in the B + → D + D − K + decay, and also show that it produces an enhancement of the D + s D − s mass distribution close to threshold which is compatible with the LHCb recent observation in thedecay which has been identified as a new state, X 0 (3960).

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We study the D * D * K * system by using the Fixed Center Approximation to the Faddeev equations. Since the D * D * interaction is attractive and gives a bound state, and so is the case of the D * K * interaction, where the J P = 0 + bound state is identified with the X 0 (2900), the D * D * K * system leads to bound states manifestly exotic with ccs open quarks. We obtain bound states of isospin I = 1/2, negative parity and total spin J = 0, 1, 2. For J = 0 we obtain one state, and for J = 1, 2 we obtain two states in each case. The widths are relatively narrow and the binding energies range from 56 MeV to 158 MeV.

Analysis of the ψ(4040) and ψ(4160) decay into D ( * ) D( * ) , D ( * ) s

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