Electromagnetic, axial-vector, and strange currents in the Skyrme model: Effects of symmetry breaking.
Electromagnetic, axial-vector, and strange currents in the Skyrme model: Effects of symmetry breaking.
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DOI：
10.1103/physrevd.43.869
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发表时间：
1991-02
期刊：
影响因子：
--
通讯作者：
Park;Schechter;Weigel
中科院分区：
文献类型：
--
作者：
Park;Schechter;Weigel
我们进一步讨论了最近提出的一种处理SU(3)Skyrme模型的方法，该方法导致了对重子质量分裂的良好预测。详细研究了矢量电流和轴向矢量电流的重子矩阵元。结果表明，自旋1/2重子的磁矩和超子的不同{tal g}{subitalA}}/{tal g}{subitalV}}比值近似服从SU(3)对称关系。这一事实是在考虑到一些非常复杂和以前被忽视的术语后才出现的。这一结果是值得注意的，因为模型中的重子波函数与SU(3)对称性有明显的不同。另一方面，核子中奇异电流的矩阵元存在着与SU(3)不变性的重要偏差。后者与一些当前非常感兴趣的实验有关，并给出了我们对它们的预测，并与其他方法进行了比较。
We further discuss a recently proposed approach to treating the SU(3) Skyrme model which led to good predictions for the baryon mass splittings. The baryon matrix elements of vector and axial-vector currents are studied in great detail. It is found that the spin-1/2 baryon magnetic moments and the various {ital g}{sub {ital A}}/{ital g}{sub {ital V}} ratios of hyperon decays approximately obey the SU(3)-symmetry relations. This fact only emerges after taking into account some very complicated and previously neglected terms. This result is remarkable in the sense that the baryon wave functions in the model differ appreciably from SU(3) symmetry. On the other hand, there are important deviations from SU(3) invariance for matrix elements of strange currents in the nucleon. The latter are relevant for some experiments of great current interest and our predictions for them are presented and compared with other approaches.