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arXiv 1701.03210hep-phhep-exnucl-exnucl-th
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从核介质中的$ϕ$产生寻找一个隐藏的奇异重子-介子束缚态

Search for a hidden strange baryon-meson bound state from $ϕ$ production in a nuclear medium

Haiyan Gao, Hongxia Huang, Tianbo Liu, Jialun Ping, Fan Wang, Zhiwen Zhao

摘要:

我们研究了隐藏的奇异轻重子-介子系统。利用共振群方法,在夸克离域色屏蔽模型中发现了两个束缚态:$η'-N$和$ϕ-N$。以$ϕ-N$束缚态为研究对象,通过计算共振散射过程中的相移,得到了约为4,MeV的总衰变宽度.为了研究$ϕ-N$束缚态的实验研究的可行性,我们进行了蒙特卡罗模拟的束缚态生产与电子束和金靶。在模拟中,我们使用CLAS 12探测器和Forward Tagger以及Jefferson实验室Hall B中的BONUS 12探测器。估计信号和背景通道两者。我们证明了信号事件可以从背景中分离出一些动量削减。因此,通过重核产生近阈$ϕ$介子的方法,在实验上寻找$ϕ-N$束缚态是可行的。

英文摘要:

We investigate the hidden strange light baryon-meson system. With the resonating-group method, two bound states, $η'-N$ and $ϕ-N$, are found in the quark delocalization color screening model. Focusing on the $ϕ-N$ bound state around 1950\,MeV, we obtain the total decay width of about 4\,MeV by calculating the phase shifts in the resonance scattering processes. To study the feasibility of an experimental search for the $ϕ-N$ bound state, we perform a Monte Carlo simulation of the bound state production with an electron beam and a gold target. In the simulation, we use the CLAS12 detector with the Forward Tagger and the BONUS12 detector in Hall B at Jefferson Lab. Both the signal and the background channels are estimated. We demonstrate that the signal events can be separated from the background with some momentum cuts. Therefore it is feasible to experimentally search for the $ϕ-N$ bound state through the near threshold $ϕ$ meson production from heavy nuclei.

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