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The oretical research on narrow width dibaryon

窄幅二重晶的理论研究

基本信息

批准号：
03640274
负责人：
UEDA Tamotsu
金额：
$ 0.38万
依托单位：
Ehime University (1992)Osaka University (1991)
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03640274/
关键词：
Dibaryon Pion-nucleon-nucleon system eta meson-induced reaction etameson-nucleon-nucleon system Multi-three body equation proton-proton scattering phase shift analysis pi-d scattering phase shift analysis pion production partial wave analysi

项目摘要

In two nucleon system the strong repulsion exists in the short-range part of the force. Then,if a resonance or quai-bound state appears, it is anormalous. The study of this state has possibility to guide one to a new concept.(1)We have analysed the nucleon-nucleon scattering data at E_L=500-800 MeV comprehensively. The eigenstates which cause the two narrow structures in the analysing power A_y are identified. The structure at E_L=610 MeV is due to the ^3F_3 or ^3H_5 state, while the one at E^L=680 MeV is due to the ^1G_4, ^3P_1,^3F_4 or ^3H_5 state. To select uniquely the solution from these plural ones, necessary and effective observables are pointed out.(2)In Faddeev calculation we have solved etaNN-piNN coupled system with two-body interaction input. We find a quasi-bound state with width 20 MeV at energy 10 MeV below the etaNN threshold. This quasibound state is generated in cooperation of strongly attractive forces existing in both the etaN S_<11> and NN ^3S_1 channels. Since no centrifugal force there, the system can be deeply bound. The decay into etaNN channel is energitically forbidden. The decay into piNN channel is also suppressed. For these reasons this quasibound state has so narrow width as 20 MeV in spite of the large width of the S_<11> resonance. In order to discover this quasibound state, we point out the signature of the state on observables for np-np,np-etad,gammad-np,gammad-etad and etad-etad processes.

在双核子系统中，强排斥力存在于短程部分。然后，如果出现共振或准束缚态，它就是反常的。对这一状态的研究有可能引导一个新的概念。(1)We对E_L=500-800 MeV的核子-核子散射数据进行了全面的分析。确定了在分析功率A_y中引起两个窄结构的本征态。在E_L=610 MeV处的结构是由^3F_3或^3H_5态产生的，而在E_L=680 MeV处的结构是由^1G_4、^3P_1、^3F_4或^3H_5态产生的。为了从这些复数解中唯一地选择解，指出了必要的和有效的观测量。(2)In Faddeev计算我们求解了具有两体相互作用输入的etaNN-piNN耦合系统。我们发现一个准束缚态的宽度为20兆电子伏的能量低于etaNN阈值10兆电子伏。这种准束缚态是在etaN S_1和NN ^3S_1通道中存在的强吸引力的协同作用下产生<11>的。由于那里没有离心力，系统可以被深深地束缚。能量上禁止衰减到etaNN通道。衰减到piNN通道也被抑制。由于这些原因，尽管S_共振的宽度很大，但这个准束缚态的宽度很窄，只有20 MeV<11>。为了发现这种准束缚态，我们指出了np-np，np-etad，gammad-np，gammad-etad和etad-etad过程的态在观测量上的特征。