Chiral extrapolation of gA with explicit Δ(1232) degrees of freedom

被引：35

作者：

Procura, M. ^{[1
]}

Musch, B. U. ^{[1
]}

Hemmert, T. R. ^{[1
]}

Weise, W. ^{[1
]}

机构：

[1] Tech Univ Munich, Dept Phys, D-85747 Garching, Germany

来源：

PHYSICAL REVIEW D | 2007年 / 75卷 / 01期

关键词：

D O I：

10.1103/PhysRevD.75.014503

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

An updated and extended analysis of the quark-mass dependence of the nucleon's axial-vector coupling constant g(A) is presented in comparison with state-of-the-art lattice QCD results. Special emphasis is placed on the role of the Delta(1232) isobar. It is pointed out that standard chiral perturbation theory of the pion-nucleon system at order p(4) fails to provide an interpolation between the lattice data and the physical point. In constrast, a version of chiral effective field theory with explicit inclusion of the Delta(1232) proves to be successful. Detailed error analysis and convergence tests are performed. Integrating out the Delta(1232) as an explicit degree of freedom introduces uncontrolled errors for pion masses m(pi)greater than or similar to 300 MeV.

引用

页数：13

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