Abstract

We report on further evidence that the Y(3940) and the recently observed Y(4140) are heavy hadron molecule states with quantum numbers J(PC) = 0(++). The Y(3940) state is considered to be a superposition of D*D+*(-) and D*(0)(D*(0)) over bar, while the Y(4140) is a bound state of D-s*(+) and D-s*(-) mesons. For the first time we give predictions for the strong Y(3940) -> J/psi omega, Y(4140) -> J/psi phi and radiative Y(3940)/Y(4140) -> gamma gamma decay widths in a phenomenological Lagrangian approach. Results for the strong J/psi V (V = omega, phi) decays clearly support the molecular interpretation of the Y(3940) and Y(4140). The alternative assignment of J(PC) = 2(++) is also tested, giving similar results for the strong decay widths.