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arXiv 1803.04069hep-phhep-exhep-latnucl-th
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自洽SU(3)手征夸克孤子模型中单个重子的电磁形状因子

Electromagnetic form factors of singly heavy baryons in the self-consistent SU(3) chiral quark-soliton model

June-Young Kim, Hyun-Chul Kim

摘要:

自洽手征夸克孤子模型是在$N_c$大极限下的相对论性π介子平均场方法,它对轻重子和重子都有相同的描述。在重夸克无限重质量的极限下,重子可以被看作是由π平均场束缚的$N_c-1$价夸克,而重夸克则是色静态源。在这个方案中,重子的结构主要由轻夸克自由度决定。在此框架下,我们计算了最低层重子的电磁形状因子。考虑了线性序的转动$1/N_c$和奇异流夸克质量修正。本文讨论了重子的电荷和磁密度,并与核子作了比较。正电荷重子的电荷半径的计算结果明确地表明,重子是一个致密体。给出了电形状因子。比较了$Σ_c^{++}$和格点量子色动力学的形状因子。我们还讨论了磁形状因子的结果。本文将自旋为1/2的重子六重态的磁矩和磁半径与其它工作和格点数据进行了比较。

英文摘要:

The self-consistent chiral quark-soliton model is a relativistic pion mean-field approach in the large $N_c$ limit, which describes both light and heavy baryons on an equal footing. In the limit of the infinitely heavy mass of the heavy quark, a heavy baryon can be regarded as $N_c-1$ valence quarks bound by the pion mean fields, leaving the heavy quark as a color static source. The structure of the heavy baryon in this scheme is mainly governed by the light-quark degrees of freedom. Based on this framework, we evaluate the electromagnetic form factors of the lowest-lying heavy baryons. The rotational $1/N_c$ and strange current quark mass corrections in linear order are considered. We discuss the electric charge and magnetic densities of heavy baryons in comparison with those of the nucleons. The results of the electric charge radii of the positive-charged heavy baryons show explicitly that the heavy baryon is a compact object. The electric form factors are presented. The form factor of $Σ_c^{++}$ is compared with that from a lattice QCD. We also discuss the results of the magnetic form factors. The magnetic moments of the baryon sextet with spin 1/2 and the magnetic radii are compared with other works and the lattice data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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