Chiral extrapolation of nucleon mass and axial coupling gA

被引：0

作者：

Procura, M ^{[1
]}

Hemmert, TR ^{[1
]}

Weise, W ^{[1
]}

机构：

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

来源：

NUCLEAR PHYSICS A | 2005年 / 755卷

关键词：

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 analyze the quark mass dependence of the nucleon mass M-N and the axial-vector coupling constant g(A) in the framework of the effective low-energy theory of QCD in the one-nucleon sector and two flavor case, namely SU(2) Baryon Chiral Perturbation Theory (BChPT). The relevant formulae are compared with those obtained using an extension of this effective field theory which explicitly includes Delta (1232) degrees of freedom. A numerical analysis is performed taking as input lattice QCD data. It turns out that in order to obtain at the one-loop level an interpolating function able to connect the physical point with present lattice data at relatively large pion masses, the inclusion of explicit Delta (1232) degrees of freedom is not decisive for the nucleon mass but crucial for g(A).

引用

页码：649C / 652C

页数：4

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