Abstract
We investigate several strong and radiative decay modes of Y(4260), by assuming that Y(4260) either is a [Formula: see text] molecular state, or has sizeable couplings with [Formula: see text] and [Formula: see text]. 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 [Formula: see text]S-wave scattering.
Highlights
The charmonium-like state Y (4260) was first observed by the BaBar collaboration in 2005.1 It was confirmed by CLEO2 and Belle.[3]
For the narrow cusp structure in the vicinity of DDthreshold, since there is no scalar charmonium state with the mass of about 2mD that has ever been observed, this radiative decay mode can be taken as a criterion to test whether such a structure is some kind of molecular state or just a cusp structure results from final state interactions (FSIs)
Summary By assuming Y (4260) is a D1Dmolecular state, we investigate several decay modes which are related with this assumption
Summary
The charmonium-like state Y (4260) was first observed by the BaBar collaboration in 2005.1 It was confirmed by CLEO2 and Belle.[3]. From the above discussion it could be concluded that most of the D D∗ events will be accumulated in the near threshold region, where we may expect strong FSIs. According to the above effective Lagrangian, the transition amplitude corresponding to the rescattering process Fig. 1(b) reads
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