期刊
EUROPEAN PHYSICAL JOURNAL C
卷 78, 期 6, 页码 -出版社
SPRINGER
DOI: 10.1140/epjc/s10052-018-5960-4
关键词
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资金
- National Natural Science Foundation of China [11522539, 11735003]
- China Postdoctoral Science Foundation [2016M600845, 2017T100008]
- DFG [TRR110]
- NSFC [11621131001]
- CAS President's International Fellowship Initiative (PIFI) [2018DM0034]
We calculate the octet baryon magnetic moments in covariant baryon chiral perturbation theory with the extended-on-mass-shell renormalization scheme up to next-to-next-to-leading order. At this order, there are nine low-energy constants, which cannot be uniquely determined by the seven experimental data alone. We propose two strategies to circumvent this problem. First, we assume that chiral perturbation theory has a certain convergence rate and use this as one additional constraint to fix the low-energy constants by fitting to the experimental data. Second, we fit to lattice QCD simulations to determine the low-energy constants. We then compare the resulting predictions of the light and strange quarkmass dependence of the octet baryon magnetic moments by the three mostly studied formulations of baryon chiral perturbation theory, namely, the extended-on-mass-shell, the infrared, and the heavy baryon approaches. It is shown that once more precise lattice data become available, one will learn more about the convergence pattern of baryon chiral perturbation theory.
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