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arXiv 1206.2979hep-ex
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新的重奇异强子

New Heavy Exotic Hadrons

C. P. Shen

摘要:

我们回顾了最近在Belle实验中对奇异态的研究。结果包括:(1)测量质量范围从阈值到4.0 GeV的$γγ\to ωϕ$、$ϕϕ$和$ωω$的截面。除了来自已建立的自旋零和自旋二粲偶素状态的信号之外,在粲偶素阈值以下存在清晰的共振结构,这是以前没有观察到的。我们对新结构进行了自旋宇称分析:(2)在B衰变中,$ηJ/ψ$和$γχ_{c1}$模中均未观察到X(3872)信号。3823.5MeV/ $c^2$窄峰(3)在反应$γχ_{c1}$中观察到底鎓态$h_b(1P)$、$h_b(2P)$和$Υ(1D)$;(4)观察到两个窄的带电结构(命名为$Z_b(10610)$和$Z_b(10650)$)在$π^{\pm}Υ(nS) (n=1,2,3)$和$π^{\pm} h_b(mP)$ $(m=1,2)$对的质谱中,它们是在Y(5S)衰变中与一个带电荷的π介子结合产生的。

英文摘要:

We review recent studies on exotic states at the Belle experiment. The results include: (1) The measurement of the cross sections of $γγ\to ωϕ$, $ϕϕ$, and $ωω$ for masses that range from threshold to 4.0 GeV. In addition to signals from well established spin-zero and spin-two charmonium states, there are clear resonant structures below charmonium threshold, which have not been previously observed. We report a spin-parity analysis for the new structures; (2) No X(3872) signal is observed in $ηJ/ψ$ or $γχ_{c1}$ mode in B decays. A narrow peak at 3823.5 MeV/$c^2$ (named as $ψ_2$) to $γχ_{c1}$ with a significance of 4.2 standard deviations including systematic uncertainty is observed in $B^{\pm} \to K^{\pm} γχ_{c1}$; (3) The bottomonium states $h_b(1P)$, $h_b(2P)$ and $Υ(1D)$ are observed in the reaction $e^+e^- \to π^+ π^- + X$; (4) The observation of two narrow charged structures (named as $Z_b(10610)$ and $Z_b(10650)$) in the mass spectra of the $π^{\pm}Υ(nS) (n=1,2,3)$ and $π^{\pm} h_b(mP)$ $(m=1,2)$ pairs that are produced in association with a single charged pion in Y(5S) decays.

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