Doubly Heavy Baryon Production at A High Luminosity $e^+ e^-$ Collider
Doubly Heavy Baryon Production at A High Luminosity $e^+ e^-$ Collider
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DOI：
10.1103/physrevd.86.054021
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发表时间：
2012-08
影响因子：
5
通讯作者：
Jun Jiang;Xing-Gang Wu;Qi-Li Liao;Xu-Chang Zheng;Zhen-Yun Fang
中科院分区：
文献类型：
--
作者：
Jun Jiang;Xing-Gang Wu;Qi-Li Liao;Xu-Chang Zheng;Zhen-Yun Fang
在非相对论QCD的框架下，我们详细讨论了在高亮度对撞机上，通过e^+e^-$湮灭通道，e^e^+e^-}\right tarrow\Gamma/Z^0\right tarrow\xi{qq^{\Prime}}+\bar{q}+\bar产生双重重子的过程。这里，$q^{(\Prime)}$代表重的$b$或$c$夸克。除了通常认为的通过双夸克态$(qq^{\Prime})[^3s_1]_{\bf\bar{3}}$的通道外，还讨论了通道通过其他重要的双夸克态的贡献，如$(qq^{\Prime})[^1s_0]_{\bf6}$。总截面的不确定度用$m_c=1.80\pm0.30$GeV和$m_b=5.10\pm0.40$GeV来预测。在一个围绕着$Z^0$质量运行的超级$Z$工厂，其高光度高达10^{34}\sim 10^{36}{\rm cm}^{-2}{\rm S}^{-1}$，我们估计大约$1.1\x 10^{5\sim 7}$$\xi_{cc}$事件，$2.6\x 10^{5\sim 7}$$\xi_{bc}$事件和$1.2\x 10^{4\sim 6}$$\xi_{bb}$事件可在一个运行年度中生成。因此，这样一个$Z$工厂将为研究可与CERN大型强子对撞机相媲美的双重重子提供一个很好的平台。
Within the framework of nonrelativistic QCD, we make a detailed discussion on the doubly heavy baryon production through the $e^+ e^-$ annihilation channel, $e^{+}e^{-}\rightarrow\gamma/Z^0 \rightarrow \Xi_{QQ^{\prime}} +\bar{Q} +\bar{Q^{\prime}}$, at a high luminosity $e^{+}e^{-}$ collider. Here $Q^{(\prime)}$ stands for the heavy $b$ or $c$ quark. In addition to the channel through the usually considered diquark state $(QQ^{\prime})[^3S_1]_{\bf\bar{3}}$, contributions from the channels through other same important diquark states such as $(QQ^{\prime})[^1S_0]_{\bf 6}$ have also been discussed. Uncertainties for the total cross sections are predicted by taking $m_c=1.80\pm0.30$ GeV and $m_b=5.10\pm0.40$ GeV. At a super $Z$-factory running around the $Z^0$ mass and with a high luminosity up to ${\cal L} \propto 10^{34}\sim 10^{36}{\rm cm}^{-2} {\rm s}^{-1}$, we estimate that about $1.1\times10^{5 \sim 7}$ $\Xi_{cc}$ events, $2.6\times10^{5 \sim 7}$ $\Xi_{bc}$ events and $1.2\times 10^{4 \sim 6}$ $\Xi_{bb}$ events can be generated in one operation year. Such a $Z$-factory, thus, will provide a good platform for studying the doubly heavy baryons in comparable to the CERN large hadronic collider.