夸克偶素L=1质量劈裂与长程囚禁势的Lorentz结构  

Mass Splittings of L=1 States of Quarkonium and Lorentz Structure of Long-rang Confinement Potential

作　　者：罗振飞 邱锡钧[1] 

机构地区：[1]中国科学院上海原子核研究所,201800

出　　处：《高能物理与核物理》1992年第8期716-722,共7页High Energy Physics and Nuclear Physics

摘　　要：利用夸克偶素L=1自旋三重态精细质量劈裂数据分析了夸克-反夸克线性囚禁势的Lorentz特性,发现线性囚禁势是Lorentz标量与少量 Lorentz矢量(η≤29%)的混合(如η=0则为纯Lorentz标量)。对实验初步测量的x(1~1p_1)和r(1~1P_1)介子质量,分析表明前者要求线性囚禁势是纯Lorentz标量。而后者要求线性囚禁势是79%的Lorentz标量与21%的Lorentz矢量的混合。The Lorentz nature of linear confinement potential of quarkantiquark pair is analyzed in the potential model by using the fine mass splittings of L=1 spin triplets in cc and bb systems. It is found that the linear confinement potential has a mixed nature of the Lorentz scalar and vector (0≤η≤29%η=0 represents the pure Lorentz scalar). For the tentatively measured X(1~1 p_1) and γ(1~1 p_1) meson masses, ir is shown that the pure Lorentz scalar of the linear confinement potential is required to obtain the mass of the former meson, while the mixture of 79% Lorentz scalar and 21% Lorentz vector is required to explain the mass of the latter one.

关 键 词：质量劈裂 L=1态 囚禁势 洛伦兹结构 

分 类 号：O572.2[理学—粒子物理与原子核物理]