Exploring the threshold behavior and implications on the nature of Y(4260) and Zc(3900)
Xiao-Hai Liu · 2014
We investigate several strong and radiative decay modes of Y (4260), by assuming that Y (4260) either is a D 1 D molecular state, or has sizeable couplings with D 0 D * and D ′ 1 D. In such ansatzes, obvious threshold enhancements or narrow cusp structures appear quite naturally without introducing a genuine resonance.And we emphasize that the radiative decay modes may be useful for studying D ( * ) D S-wave scattering.