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arXiv 1004.1291hep-phhep-exnucl-th
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红外约束相对论组分夸克模型中四夸克态X(3872)的夸克模型描述

Quark model description of the tetraquark state X(3872) in a relativistic constituent quark model with infrared confinement

Stanislav Dubnicka, Anna Z. Dubnickova, Mikhail A. Ivanov, Juergen G. Korner

摘要:

我们探讨了将X(3872)介子作为四夸克束缚态处理的结果。作为动力学框架,我们采用相对论组分夸克模型,其中包括在一个有效的方式红外禁闭。通过中间离壳态X-> Jpsi+ρ(ω)和X-> \bar D + D* 计算了观测到的通道X-> Jpsi+2π(3π)和X-> \bar D 0 + \pi 0的衰变宽度.对于X(3872)的尺寸参数的合理值,我们发现与现有的实验数据一致。我们还讨论了X(3872)在JPSI解离截面的S通道优势描述中的可能影响。

英文摘要:

We explore the consequences of treating the X(3872) meson as a tetraquark bound state. As dynamical framework we employ a relativistic constituent quark model which includes infrared confinement in an effective way. We calculate the decay widths of the observed channels X-> Jpsi+2π(3π) and X-> \bar D0+D0+\pi0 via the intermediate off--shell states X-> Jpsi+ρ(ω) and X-> \bar D + D*. For reasonable values of the size parameter of the X(3872) we find consistency with the available experimental data. We also discuss the possible impact of the X(3872) in a s-channel dominance description of the Jpsi-dissociation cross section.

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