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首页> 外文期刊>Journal of Physics, G. Nuclear and Particle Physics: An Institute of Physics Journal >Possible interpretation of the Z _b(10610) and Z _b(10650) in a chiral quark model
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Possible interpretation of the Z _b(10610) and Z _b(10650) in a chiral quark model

机译:手性夸克模型中Z _b(10610)和Z _b(10650)的可能解释

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摘要

Motivated by the two charged bottomonium-like resonances Z _b(10610) and Z _b(10650) newly observed by the Belle collaboration, the possible molecular states composed of a pair of heavy mesons, BB?, BB?~*, B~*B?~*, BsB?, etc (in S-wave), are investigated in the framework of chiral quark models by the Gaussian expansion method. The bound states BB?~* and B~*B?~* with quantum numbers I(JPC) = 1(1 ~(+-)), which are good candidates for the Z _b(10610) and Z _b(10650), respectively, are obtained. Another three bound states BB?~* with I(J ~(PC)) = 0(1 ~(++)), B~*B?~* with I(J ~(PC)) = 1(0 ~(++)), 0(2 ~(++)) are predicted. These states may be observed in an open-bottom or a hidden-bottom decay channel of highly excited γ.When directly extending the quark model to the hidden-color channel of the multi-quark system, more deeply bound states are found. Future experimental search of those states will cast doubt on the validity of applying the chiral constituent quark model to the hidden-color channel directly.
机译:由Belle协作新观察到的两个带电的类bottom原子共振Z _b(10610)和Z _b(10650)激发,可能的分子态由一对重介子BB?,BB?〜*,B〜*组成用高斯展开法在手性夸克模型的框架内研究了B?〜*,BsB?等(在S波中)。具有量子数I(JPC)= 1(1〜(+-))的束缚态BB?〜*和B〜* B?〜*,是Z _b(10610)和Z _b(10650)的良好候选者分别获得。 I(J〜(PC))= 0(1〜(++))的另外三个边界状态BB?〜*,I(J〜(PC))= 1(0〜( ++)),预计为0(2〜(++))。这些状态可以在高度激发的γ的开底或暗底衰减通道中观察到。当将夸克模型直接扩展到多夸克系统的暗色通道时,会发现绑定更深的状态。未来对这些状态的实验搜索将使人们对直接将手性成分夸克模型应用于隐色通道的有效性产生怀疑。

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