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arXiv 1209.6592hep-phhep-ex
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Y(4260)作为粲偶素-四夸克混合态

Y(4260) as a mixed charmonium-tetraquark state

J. M. Dias, R. M. Albuquerque, M. Nielsen, C. M. Zanetti

摘要:

利用QCD求和定则方法研究了Y(4260)态,假设它可以用$J^{PC}=1^{--}$量子数的粲偶素-四夸克混合流来描述.对于$θ\approx (53.0\pm 0.5)^{0}$周围的混合角,我们得到的质量值与Y(4260)的实验质量非常一致。然而,对于衰变宽度,我们发现值$\Ga_Y \approx (1.0\pm 0.2)$ MeV与实验值$\Ga \approx (88\pm 23)$ MeV不兼容。因此,我们得出结论,虽然我们可以解释Y(4260)的质量,但这种状态不能被描述为一个混合的粲夸克态,因为在这个假设下,我们不能解释它的衰变宽度。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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