Tetraquark Interpretation of the Charged Bottomonium-like states $Z_b^{+-}(10610)$ and $Z_b^{+-}(10650)$ and Implications
Tetraquark Interpretation of the Charged Bottomonium-like states $Z_b^{+-}(10610)$ and $Z_b^{+-}(10650)$ and Implications
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DOI：
10.1103/physrevd.85.054011
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发表时间：
2011-10
影响因子：
5
通讯作者：
A. Ali;C. Hambrock;Wei Wang
中科院分区：
文献类型：
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作者：
A. Ali;C. Hambrock;Wei Wang
我们给出了四夸克对带电的类底原子态Z+-b(10610)和Z+-b(10650)的解释，这是通过Belle合作在pi+-upsilon(n=1，2，3)和pi+-hb(Mp)(m=1，2)不变质量谱中观察到的，这些不变的质量谱取自Upsilon(5S)峰附近的数据。在这个框架中，潜在的过程包括矢量四夸克Y_b(10890)，e+e-->；Y_b(10890)-->；[Z+-b(10610)pi-+，Z+-b(10650)pi-+]的产生和衰变，随后是衰变[Z+-b(10610)，Z+-b(10650)]-->；pi+-Upsilon(NS)，pi+-hb(MP)。结合介子环的贡献和有效的哈密顿量，我们能够重现Z+-b(10610)和Z+-b(10650)的观测质量。这里给出的分析与Belle的数据是一致的，并提供了对四夸克假说的关键检验。我们还计算了Charm区相应的介子环效应，发现它们被动态地抑制了。通过Y(4260)-->；Z+-c(3752)pi-+和Y(4260)-->；Z+-c(3882)pi-+，以及随后的衰变(Z+-c(3752)，Z+-c(3882)pi-)，可以在J^{pc}=1^{--}四夸克态Y(4260)--gt；Z+-c(3752)和Z+-c(3882)pi-+的衰变中寻找带电的类碳态Z+-c(3752)和Z+-c(3882)。
We present a tetraquark interpretation of the charged bottomonium-like states Z+-_b(10610) and Z+-_b(10650), observed by the Belle collaboration in the pi+- Upsilon(nS) (n=1,2,3) and pi+- h_b(mP) (m=1,2) invariant mass spectra from the data taken near the peak of the Upsilon(5S). In this framework, the underlying processes involve the production and decays of a vector tetraquark Y_b(10890), e+e- --> Y_b(10890) --> [Z+-_b(10610)pi-+, Z+-_b(10650)pi-+] followed by the decays [Z+-_b (10610), Z+-_b (10650)] --> pi+- Upsilon(nS), pi+- h_b(mP). Combining the contributions from the meson loops and an effective Hamiltonian, we are able to reproduce the observed masses of the Z+-_b(10610) and Z+-_b(10650). The analysis presented here is in agreement with the Belle data and provides crucial tests of the tetraquark hypothesis. We also calculate the corresponding meson loop effects in the charm sector and find them dynamically suppressed. The charged charmonium-like states Z+-_c(3752) and Z+-_c(3882) can be searched for in the decays of the J^{PC}=1^{--} tetraquark state Y(4260) via Y(4260) --> Z+-_c(3752)pi-+ and Y(4260) --> Z+-_c(3882)pi-+, with the subsequent decays (Z+-_c(3752),Z+-_c(3882)) --> (J/psi, h_c)pi+-.