Possible Molecular Structure of the Newly Observed Y(4260)

Details Possible Molecular Structure of the Newly Observed Y(4260) Possible Molecular Structure of the Newly Observed Y(4260)

2005-07-14

arxiv.org/abs/hep-ph/0507177v3

Phys.Rev.D72:054023,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 2 figures. Some descriptions changed, more references added and typos corrected. Published version in PRD

Scientific paper

10.1103/PhysRevD.72.054023

We suggest that the newly observed resonance Y(4260) is a $\chi_{c}-\rho^0$ molecule, which is an isovector. In this picture, we can easily interpret why $Y(4260)\to \pi^+\pi^-J/\psi$ has a larger rate than $Y(4260)\to D\bar D$ which has not been observed, and we also predict existence of the other two components of the isotriplet and another two possible partner states which may be observed in the future experiments. A direct consequence of this structure is that for this molecular structure $Y(4260)\to \pi^+\pi^-J/\psi$ mode is more favorable than $Y(4260)\to K\bar KJ/\psi$ which may have a larger fraction if other proposed structures prevail.

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