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arXiv · 1209.6592

Y(4260) as a mixed charmonium-tetraquark state

J. M. Dias·R. M. Albuquerque·M. Nielsen·C. M. Zanetti
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Abstract

Using the QCD sum rule approach we study the Y(4260) state assuming that it can be described by a mixed charmonium-tetraquark current with $J^{PC}=1^{--}$ quantum numbers. For the mixing angle around $θ\approx (53.0\pm 0.5)^{0}$, we obtain a value for the mass which is in good agreement with the experimental mass of the Y(4260). However, for the decay width we find the value $\Ga_Y \approx (1.0\pm 0.2)$ MeV which is not compatible with the experimental value $\Ga \approx (88\pm 23)$ MeV. Therefore, we conclude that, although we can explain the mass of the Y(4260), this state cannot be described as a mixed charmonium-tetraquark state since, with this assumption, we can not explain its decay width.

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J. M. Dias, R. M. Albuquerque, M. Nielsen, C. M. Zanetti. 2012-09-28. Y(4260) as a mixed charmonium-tetraquark state. https://doi.org/10.1103/physrevd.86.116012

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