Decays of doubly charmed meson molecules

Abstract

Several observed states close to the DD * and D * (s)D * (s) thresholds, as the X(3872) and some XYZ particles can be described in terms of a two-meson molecule. Furthermore, doubly charmed states are also predicted. These new states are near the D * D * and D * D * s thresholds, and have spin-parity J P = 1 + . Their natural decay modes are D (s) D * , DD (s) π and DD (s) γ and D * D (s) γ. We evaluate the widths of these states, named here as R cc (3970) and S cc (4100), and obtain 44 MeV for the non-strangeness, and 24 MeV for the doubly charm-strange state. Essentially, the decay modes are DD (s) π and DD (s) γ, being the Dπ and Dγ emitted by one of the D * meson which forms the molecule.