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.
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页数：4
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