Abstract

In the present work the Y(4260) resonance is considered as a weakly bound state of a pseudoscalar D and an axial D-1 charm meson. We consider the two-body decay Y (4260) -> Z(c)(3900) (+/-) + pi(-/+), where Z(c()3900)(+/-) is treated as hadron molecule as well. Moreover we compute the Y(4260) decay modes J/psi pi(+)pi(-), recently observed by the BESIII Collaboration, and psi(2S)pi(+)pi(-). In the last process both the contact diagram with DD1 -> psi(nS)pi(+)pi(-) and the resonance diagram with DD1 -> Z(c) (3900)(+/-) + pi(+/-) -> psi(nS) pi(+)pi(-) are taken into account.