Nucleon mass and pion-nucleon sigma term from a chiral analysis of lattice QCD world data

被引：5

作者：

Alvarez-Ruso, L. ^{[1
]}

Ledwig, T. ^{[2
,3
]}

Camalich, J. Martin ^{[4
]}

Vicente Vacas, M. J. ^{[2
,3
]}

机构：

[1] Ctr Mixto Univ Valencia CSIC, Inst Fisica Corpuscular IFIC, Valencia, Spain

[2] Ctr Mixto Univ Valencia CSIC, Dept Fisica Teor, Valencia, Spain

[3] Ctr Mixto Univ Valencia CSIC, IFIC, Valencia, Spain

[4] Univ Sussex, Dept Phys & Astron, Brighton, E Sussex, England

来源：

MENU 2013 - 13TH INTERNATIONAL CONFERENCE MESON-NUCLEON PHYSICS AND THE STRUCTURE OF THE NUCLEON | 2014年 / 73卷

关键词：

D O I：

10.1051/epjconf/20147304015

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The chiral behavior of the nucleon mass is studied within the covariant SU(2) baryon chiral perturbation theory up to order p(4). Lattice QCD data for the ensembles of 2 and 2 + 1 flavors are separately fitted, paying special attention to explicit Delta(1232) degrees of freedom, finite volume corrections and finite spacing effects. In the case of the 2 flavor ensemble, we fit simultaneously nucleon mass data together with new and updated data for the sigma(pi N) term both in their dimensionless forms and determine a Sommer-scale of r(0) = 0.493(23) fm. We obtain low-energy constants of natural size that are compatible with the rather linear pion-mass dependence observed in lattice QCD and report a preliminary updated value of sigma(pi N) = 43(5)(4) MeV for the 2 flavor case and sigma(pi N) = 52(3)(8) MeV for 2 + 1 flavor case.

引用

页数：4

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