Baryon electric dipole moments from strong CP violation

被引：53

作者：

Guo, Feng-Kun ^{[1
,2
]}

Meissner, Ulf-G. ^{[1
,2
,3
,4
,5
]}

机构：

[1] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany

[2] Univ Bonn, Bethe Ctr Theoret Phys, D-53115 Bonn, Germany

[3] Forschungszentrum Julich, Inst Kernphys, Inst Adv Simulat, D-52425 Julich, Germany

[4] Forschungszentrum Julich, JARA FAME, Julich Ctr Hadron Phys, D-52425 Julich, Germany

[5] Forschungszentrum Julich, JARA HPC, D-52425 Julich, Germany

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2012年 / 12期

关键词：

Chiral Lagrangians; Lattice QCD; CP violation; CHIRAL PERTURBATION-THEORY; NEUTRON EDM; FORM-FACTOR; NUCLEONS;

D O I：

10.1007/JHEP12(2012)097

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The electric dipole form factors and moments of the ground state baryons are calculated in chiral perturbation theory at next-to-leading order. We show that the baryon electric dipole form factors at this order depend only on two combinations of low-energy constants. We also derive various relations that are free of unknown low-energy constants. We use recent lattice QCD data to calculate all baryon EDMs. In particular, we find d(n) = -2.9 +/- 0.9 and d(p) = 1.1 +/- 1.1 in units of 10(-16) e theta(0) cm. Finite volume corrections to the electric dipole moments are also worked out. We show that for a precision extraction from lattice QCD data, the next-to-leading order terms have to be accounted for.

引用

页数：31

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