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arXiv 0903.0779hep-phhep-latnucl-th
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手征微扰理论中首阶十重态对重子磁矩的贡献

Leading-order decuplet contributions to the baryon magnetic moments in Chiral Perturbation Theory

L. S. Geng, J. Martin Camalich, M. J. Vicente Vacas

摘要:

我们推广了早先在手征微扰理论中对重子磁矩的研究,将自旋3/2的十重态共振显式地包含在内。我们发现,这些较重的自由度引起的修正是相对较小的协变框架中,非物理自旋1/2模式被删除。因此,通过引入由重子和十重态贡献给出的SU(3)破缺修正,我们得到了一个比Coleman-Schwarhow关系更好的重子-八重态磁矩的描述.最后,我们讨论了重子方法和协变方法的不确定性,并对重子方法和协变方法进行了比较。

英文摘要:

We extend an earlier study of the baryon magnetic moments in chiral perturbation theory by the explicit inclusion of the spin-3/2 decuplet resonances. We find that the corrections induced by these heavier degrees of freedom are relatively small in a covariant framework where unphysical spin-1/2 modes are removed. Consequently, implementing the leading SU(3)-breaking corrections given by both the baryon and decuplet contributions, we obtain a description of the baryon-octet magnetic moments that is better than the Coleman-Glashow relations. Finally, we discuss the uncertainties and compare between heavy baryon and covariant approaches.

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