Four quark interpretation of Y(4260)
- L. Maiani(,)
- Rome U. and
- INFN, Rome
- V. Riquer(,)
- Rome U. and
- INFN, Rome
- ,
- A.D. Polosa()
- Bari U. and
- INFN, Bari
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Abstract: (arXiv)
We propose that the Y(4260) particle recently announced by BaBar is the first orbital excitation of a diquark-antidiquark state ([cs][cbar sbar]). Using parameters recently determined to describe the X(3872) and X(3940) we show that the Y mass is compatible with the orbital excitation picture. A crucial prediction is that Y(4260) should decay predominantly in D_s D_sbar. The Y(4260) should also be seen in B non-leptonic decays in association with one kaon. We consider the full nonet of related four-quark states and their predicted properties. Finally, we comment on a possible narrow resonance in the same channel.- 12.39.-x
- 12.38.-t
- hadron spectroscopy
- new particle: Y(4260)
- quark: diquark
- excited state
- meson: multiplet
- meson: mass formula
- effective Hamiltonian: hyperfine structure
- meson: hadronic decay
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