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arXiv 0910.3628hep-ph
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协变重子手征微扰理论中超子矢量耦合$f_1(0)$的SU(3)破缺修正

SU(3)-breaking corrections to the hyperon vector coupling $f_1(0)$ in covariant baryon chiral perturbation theory

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

摘要:

本文报道了在具有动力学八重态和十重态贡献的协变重子手征微扰理论中,对超子矢量耦合$f_1(0)$到$\mathcal{O}(p^4)$的SU(3)破缺修正的研究.十重峰的贡献考虑到第一次在协变的ChPT研究,并发现类似的或甚至更大的尺寸比八重峰的。我们预测了所有四个独立的$f_1(0)$的正SU(3)破缺修正(假设同位旋对称),这与大$N_c$拟合、手征夸克模型和猝灭格点量子色动力学计算的最新结果在不确定性范围内是一致的。我们还简要讨论了我们的结果的影响,从超子衰变数据的提取$V_{us}$。

英文摘要:

We report on a recent study of the SU(3)-breaking corrections to the hyperon vector coupling $f_1(0)$ up to $\mathcal{O}(p^4)$ in covariant baryon chiral perturbation theory with dynamical octet and decuplet contributions. The decuplet contributions are taken into account for the first time in a covariant ChPT study and are found of similar or even larger size than the octet ones. We predict positive SU(3)-breaking corrections to all the four independent $f_1(0)$'s (assuming isospin symmetry), which are consistent, within uncertainties, with the latest results from large $N_c$ fits, chiral quark models, and quenched lattice QCD calculations. We also discuss briefly the implications of our results for the extraction of $V_{us}$ from hyperon decay 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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