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arXiv 1409.3291hep-ph
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作为耦合沟道尖点的$Z_b$和$Z_c$奇异态

$Z_b$ and $Z_c$ Exotic States as Coupled Channel Cusps

E. S. Swanson

摘要:

证明了四夸克态$Z_b(10610)$、$Z_b(10650)$、$Z_c(3900)$和$Z_c(4025)$是耦合沟道尖点效应。该模型以自然的方式解释了假定态的质量和量子数以及$Z_b$态宽度的近似相等。有人认为,$Z_c(3900)$和$Z_c(4025)$应该在$\bar B^0 \to J/ψπ^0π^0$或$B^- \to J/ψπ^- π^0$中可见,但{ \it not}应该出现在$\bar B^0 \to J/ψπ^+π^-$中,与最近的LHCb结果一致。建议对尖点效应进行额外的测试。

英文摘要:

It is demonstrated that the candidate tetraquark states $Z_b(10610)$, $Z_b(10650)$, $Z_c(3900)$, and $Z_c(4025)$ are coupled channel cusp effects. The model explains in a natural way the masses and quantum numbers of the putative states and the near equality of the widths of the $Z_b$ states. It is argued that the $Z_c(3900)$ and $Z_c(4025)$ should be visible in $\bar B^0 \to J/ψπ^0π^0$ or $B^- \to J/ψπ^- π^0$, but should {\it not} appear in $\bar B^0 \to J/ψπ^+π^-$, in agreement with recent LHCb results. Additional tests for cusp effects are suggested.

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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