共查询到17条相似文献,搜索用时 46 毫秒
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高能反应中,自旋3+/2重子的产生与1+/2重子相比,受到反常的极强抑制.本文证明这是夸克味道守恒的结果:多重产生中奇异夸克抑制.λ=/<1,决定了十重态重子只能以确定比例β与八重态重子一起产生,而且β=1+λ/3+2λ 相似文献
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从单胶子交换正反夸克对产生模型出发,研究了核子间等效ρω介子交换势.计算结果表明这个模型能得到强子层次核力介子交换理论中ρ,ω介子交换势的各个部分,并且定性性质与传统的介子交换势也是相同的. 相似文献
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本文提出了一个新的夸克势模型-夸克脱定域色屏蔽模型。此模型不用介子交换就给出既有排斥心又有中程吸引的核力,并且定性符合N-N散射相移^1So、^3Sr、^1P1和^P1s。首次从动力学证明了可能存在两类双重子。 相似文献
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本文提出了一个新的夸克势模型──夸克脱定域色屏蔽模型.此模型不用介子交换就给出既有排斥心又有中程吸引的核力,并且定性符合N-N散射相移1S0、3S1、1P1和3P1a首次从动力学证明了可能存在两类双重子.一类是像氘核那样的低自旋、弱束缚的双重子,另一类是高自旅、强束缚的六夸克态,d就是一个典型例子,它很可能是一个窄双重子共振态.一个平行的相对论性夸克势模型证实了与上述非相对论势模型有关的双重子态的预言. A new quark potential model, called quark delocalization and color screening model, has been proposed.This model yields both N-N repulsive core and intermediate range attraction without involving the meson exchange and fits the N-N 1S0,3S1,1p1and 3Pls phase shifts qualitatively. It verified dynamically that there might be two kinds of dibaryons.One is the deuteron like low spin, loosely binding two baryon states.The other is the high spin, strong binding six quark states, d. is a typical example and is... 相似文献
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自旋轨道耦合和自旋流的研究若干进展 总被引:1,自引:0,他引:1
近十年来,国内外科学工作者对自旋轨道耦合和自旋流作了很多深入的研究.文章介绍该领域的一些重要进展以及它的发展情况,包括介绍由自旋轨道耦合所引起的内在自旋霍尔效应和持续自旋流、自旋流的产生、自旋流的定义以及自旋流产生电场等.最后也讨论一些有待于解决的课题,以及对该领域的展望. 相似文献
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Spin-orbit force of the NN interaction is studied in the framework of the chiral SU(3) quark model. Both symmetric and antisymmetric spin-orbit (LS) forces of the one gluon exchange and scalar meson exchanges are taken into account. It is shown that although the inclusions of the LS forces caused by the scalar meson exchanges and the antisymmetric LS terms in this model can notably strengthen the LS couplings in the states of 3PJ of the NN interaction, an additional enhancement factor is still needed in order to describe the experimental data. 相似文献
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WANG Qing-Wu LEE Xi-Guo 《理论物理通讯》2008,49(4):971-976
Baryon magnetic moments of p, n, ∑^+,∑^-,Ξ^0, Ξ^- and the beta decay ratios (G A/Gv ) of n → p, ∑^-→n and Ξ^0→∑^+ are calculated in a colored quark cluster model. With SU(3) breaking, the model gives a good fit to the experimental values of those baryon magnetic moments and the beta decay ratios. Our results show that the orbital motion has a significant contribution to the spin and magnetic moments of those baryons and the strange component in nucleon is small. 相似文献
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In this paper, we calculate the top quark rare decays t →cγ and v in an extension of the standard model, where baryon number and lepton number are local gauge symmetries. Adopting reasonable assumptions on the parameter space, we find that the branching ratios of t →cγ and t →cg can reach 10^-6 and 10^-5 respectively, which can be detected in near future. 相似文献
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通过对两重子集团间夸克交换项的分析指出,两重子系统的夸克效应是两集团靠得很近时,并在相对运动的低次波(S波)中才能充分表现出来.对给定的两重子态其夸克效应的性质由自旋、味道和色空间置换算符在该态的矩阵元决定.有些自旋–味道状态,Pauli堵塞效应很严重,必然存在着很强的排斥心;另一些自旋–味道状态,夸克交换效应有助于把两个重子“融合”到一起,从而形成双重子态.因此,两重子系统的结合能和散射相移的数据是检验它们之间夸克效应的重要场所. 相似文献
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利用夸克统计模型和强子产额的实验数据,研究了 反应中的夸克对产生率、奇异抑制因子和重子介子比,得到了这些量随能量的变化规律. 相似文献
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We investigate mixing of the lowest-lying qqq configurations with J~P=1/2~-caused by the hyperfine interactions between quarks mediated by Goldstone Boson Exchange,One Gluon Exchange,and both Goldstone Boson and One Gluon exchange,respectively.The first orbitally excited nucleon,Σ,ΛandΞstates are considered.Contributions of both the contact term and tensor term are taken into account.Our numerical results show that mixing of the studied configurations in the two employed hyperfine interaction models are very different.Therefore,the present results,which should affect the strong and electromagnetic decays of baryon resonances,may be used to examine the present employed hyperfine interaction models. 相似文献