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基于S_3味对称性的轻子质量谱和味混合模式模型(英文)
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作者 杨德山 杨兴华 《中国科学院大学学报(中英文)》 CSCD 北大核心 2016年第4期468-476,共9页
为解释轻子质量谱和中微子味混合模式,从味对称性出发,构造一个简单的基于S3味对称性的type-Ⅱ跷跷板模型.在模型中,假设轻子质量矩阵具有S3味对称性,并且该对称性可经由破缺链S3→Z2→φ显示破缺.计算得到与最新实验数据符合较好的中... 为解释轻子质量谱和中微子味混合模式,从味对称性出发,构造一个简单的基于S3味对称性的type-Ⅱ跷跷板模型.在模型中,假设轻子质量矩阵具有S3味对称性,并且该对称性可经由破缺链S3→Z2→φ显示破缺.计算得到与最新实验数据符合较好的中微子振荡混合角(θ12,θ23和θ13)和最大的Dirac CP破坏相角δ≈270°. 展开更多
关键词 轻子质量谱 轻子混合 味对称性 跷跷板机制
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→■_2~*(1430)ω中的电荷不对称性及其对~0→a_2(1320)^- π^+和a_2(1320)^-ρ^+的影响(英文)
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作者 杨德山 杨绍恺 《中国科学院研究生院学报》 CAS CSCD 北大核心 2012年第4期433-438,共6页
BaBar实验组在→■_2~*(1430)ω衰变中观测到大的电荷不对称性.我们指出增强的张量介子发射图贡献可以解释这种不对称性.从实验结果中提取出张量介子发射图的贡献,将其应用到~0→a_2(1320)~- π~+衰变中.预言的结果比以往的理... BaBar实验组在→■_2~*(1430)ω衰变中观测到大的电荷不对称性.我们指出增强的张量介子发射图贡献可以解释这种不对称性.从实验结果中提取出张量介子发射图的贡献,将其应用到~0→a_2(1320)~- π~+衰变中.预言的结果比以往的理论预言要大很多.该结果将在不久的KEK-SuperB、LHCb实验中得到检验. 展开更多
关键词 B衰变 电荷不对称性 张量介子 QCD因子化 味对称性
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A Model of Fermion Masses and Flavor Mixings with Family Symmetry SU(3)U(1)
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作者 YANG Wei-Min WANG Qi ZHONG Jin-Jin 《Communications in Theoretical Physics》 SCIE CAS CSCD 2012年第1期71-77,共7页
The family symmetry SU(3) U(1) is proposed to solve flavor problems about fermion masses and flavor mixings. It is breaking is implemented by some flavon fields at the high-energy scale. In addition a discrete gro... The family symmetry SU(3) U(1) is proposed to solve flavor problems about fermion masses and flavor mixings. It is breaking is implemented by some flavon fields at the high-energy scale. In addition a discrete group Z2 is introduced to generate tiny neutrino masses, which is broken by a real singlet scalar field at the middle-energy scale. The low-energy effective theory is elegantly obtained after all of super-heavy fermions are integrated out and decoupling. All the fermion mass matrices are regularly characterized by four fundamental matrices and thirteen parameters. The model can perfectly fit and account for all the current experimental data about the fermion masses and flavor mixings, in particular, it finely predicts the first generation quark masses and the values of θ13and JCp in neutrino physics. All of the results are promising to be tested in the future experiments. 展开更多
关键词 family symmetry fermion mass flavor mixing neutrino physics
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Electrical Neutrality and Symmetry Restoring Phase Transitions at High Density in a Two-Flavor Nambu-Jona-Lasinio Model
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作者 WANG Xiao-Ming ZHOU Bang-Rong 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第6期1081-1087,共7页
A general research on chiral symmetry restoring phase transitions at zero temperature and finite chemical potentials under electrical neutrality condition has been conducted in a Nambu-Jona-Lasinio model to describe t... A general research on chiral symmetry restoring phase transitions at zero temperature and finite chemical potentials under electrical neutrality condition has been conducted in a Nambu-Jona-Lasinio model to describe twoflavor normal quark matter. Depending on whether mo/A, the ratio of dynamical quark mass in vacuum and the 3D momentum cutoff in the loop integrals, is less or greater than 0.413, the phase transition will be of the second or first order. A complete phase diagram of u quark chemical potential versus mo is given. With the electrical neutrality constraint, the region where the second order phase transition happens will be wider than the one without electrical neutrality limitation. The results also show that, for the value ofmo/A from QCD phenomenology, the phase transition must be of the first order. 展开更多
关键词 normal quark matter electrical neutrality Nambu-Jona-Lasinio model high density chiral symmetry restoring first and second order phase transitions
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