Octet baryon masses and sigma terms in covariant baryon chiral perturbation theory

被引：0
作者：
Ren, Xiu-Lei [1 ]
Geng, Li-Sheng [1 ,2 ]
Meng, Jie [3 ,4 ]
机构：
[1] Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China
[2] Beihang Univ, Int Res Ctr Nuclei & Particles Cosmos, Beijing 100191, Peoples R China
[3] Peking Univ, Sch Phys, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China
[4] Univ Stellenbosch, Dept Phys, ZA-7602 Stellenbosch, South Africa
来源：
Chiral Symmetry in Hadrons and Nuclei | 2015年
关键词：
Chiral lagrangians; lattice QCD calculations; Baryon resonances; CONTINUUM-LIMIT; WILSON FERMIONS;
D O I：
暂无
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
We report an analysis of the octet baryon masses using the covariant baryon chiral perturbation theory up to next-to-next-to-next-to-leading order with and without the virtual decuplet contributions. Particular attention is paid to the finite-volume corrections and the finite lattice spacing effects on the baryon masses. A reasonable description of all the publicly available n(f) = 2 + 1 lattice QCD data is achieved. Utilyzing the Feynman-Hellmann theorem, we determine the nucleon sigma terms as sigma N-pi = 55(1)(4) MeV and sigma N-s = 27(27)(4) MeV.
引用
收藏
页码：181 / 185
页数：5
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