Lowest-lying baryon masses in covariant SU(3)-flavor chiral perturbation theory
Lowest-lying baryon masses in covariant SU(3)-flavor chiral perturbation theory
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DOI：
10.1103/physrevd.82.074504
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发表时间：
2010-03
影响因子：
5
通讯作者：
J. Camalich;L. Geng;M. V. Vacas
中科院分区：
文献类型：
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作者：
J. Camalich;L. Geng;M. V. Vacas
本文用协变SU（3）味手征微扰理论分析了重子八重态和重子十重态的质量。除了对物理质量的描述外，我们还讨论了格点QCD外推问题。利用PACS-CS协作数据，我们表明，一个很好的描述的格点可以实现在次领先的顺序与协变环振幅和唯象确定的值的介子重子耦合。此外，外推到物理点到这个顺序被发现是更好的比线性的Gell-Mann-Okubo方法给出的领导阶。通过对π重子和奇异重子σ项的预测，强调了格点QCD和手征微扰理论的可靠结合对强子现象学的重要性。
We present an analysis of the baryon-octet and -decuplet masses using covariant SU(3)-flavor chiral perturbation theory up to next-to-leading order. Besides the description of the physical masses we address the problem of the lattice QCD extrapolation. Using the PACS-CS Collaboration data we show that a good description of the lattice points can be achieved at next-to-leading order with the covariant loop amplitudes and phenomenologically determined values for the meson-baryon couplings. Moreover, the extrapolation to the physical point up to this order is found to be better than the linear one given at leading-order by the Gell-Mann-Okubo approach. The importance that a reliable combination of lattice QCD and chiral perturbation theory may have for hadron phenomenology is emphasized with the prediction of the pion-baryon and strange-baryon sigma terms.