Quark-Model Description of the Hyperon-Nucleon Interaction and its

本项目的目的是研究组成夸克模型中的超子-核子相互作用。我们改进了RGM-F的有效介子交换势，将所有作用于夸克之间的伪标量介子-nonet交换的自旋-自旋和张量项结合起来。明确地计算了这些有效介子交换势的夸克交换核的自旋风味因子。我们的新版本夸克模型，FSS和RGM-H，然后被用于研究超子-核子相互作用在宽能量范围内的散射观测。KEK实验KEK- ps E251给出了中间能量下SIGMA^+p散射截面的新数据，这与我们的夸克模型预测并不矛盾。通过KEK-PS E289实验的分析，期望得到更多的Ap和SIGMA^-p散射的实验数据。我们已经发展了夸克RGM（共振群方法）的Lippmann-Schwinger形式，以接近更高的能量，而目前使用的变分散射方法不能产生足够的精度。通过这种改进，我们计算了入射能量达到800 MeV时pp和np弹性散射的微分截面和极化。定性地再现了能量依赖性和角分布的总体行为。该技术还用于计算核子-核子相互作用的g矩阵，并在FSS中进行核物质计算。饱和点位于高密度侧的Coester线附近。我们还用RGM-F检验了奇异度为S=-2的重子-重子相互作用。RGM-F中h粒子的结合能为19 MeV，在p_<XI>=500 MeV /c时，预测的XI^-p总截面分别为sigma_<el> (XI^-p) =26mb、sigma (XI^-p*XI^0n) =23mb和sigma (XI^-p*LAMBDALAMBDA) =18mb。

The purpose of this project is to study the hyperon-nucleon interaction in the constituent quark model. We have improved the effective meson-exchange potentials of RGM-F, by incorporating the spin-spin and tensor terms of all the pseudo-scalar meson-nonet exchanges acting between quarks. The spin-flavor factors of the quark exchange kernel for these effective meson-exchange potentials are explicitly calculated. The new versions of our quark model, FSS and RGM-H, are then employed to study scattering observables of the hyperon-nucleon interaction in the wide energy range. The KEK experiment KEK-PS E251 has given a new data for the SIGMA^+p scattering cross sections at the intermediate energies, which is not inconsistent with our quark-model prediction. Further experimental data for the Ap and SIGMA^-p scattering are expected through the analysis of KEK-PS E289 experiment. We have developed the Lippmann-Schwinger formalism of the quark RGM (resonating-group method) to approach higher energies where the variational method for scattering employed so far does not yield cnough accuracy. By this improvement, we have calculated the differential cross sections and polarization of the pp and np elastic scattering up to the incident energy of 800 MeV.The gross behavior of the energy-dependence and the angular distribution is qualitatively reproduced. This technique is also applied to calculate the G-matrix for the nucleon-nucleon interaction, and the nuclear matter calculation was performed in FSS.The saturation point lies near the Coester line on the higher-density side. We have also examined the baryon-baryon interaction with the stangeness S=-2 by using RGM-F.The binding energy of the H-particle in RGM-F is 19 MeV, and the predicted XI^-p total cross sections at p_<XI>=500 Mev/c are sigma_<el> (XI^-p) =26mb, sigma (XI^-p*XI^0n) =23mb and sigma (XI^-p*LAMBDALAMBDA) =18mb.