Nucleon electric dipole moment with the gradient flow: The θ-term contribution

被引：31

作者：

Shindler, Andrea ^{[1
]}

Luu, Thomas ^{[1
]}

de Vries, Jordy ^{[1
]}

机构：

[1] Forschungszentrum Julich, JARA HPC, Julich Ctr Hadron Phys, Inst Adv Simulat,Inst Kernphys, D-52425 Julich, Germany

来源：

PHYSICAL REVIEW D | 2015年 / 92卷 / 09期

关键词：

O(A) IMPROVEMENT; FORM-FACTOR; LATTICE; NEUTRON; QCD;

D O I：

10.1103/PhysRevD.92.094518

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We propose a new method to calculate electric dipole moments induced by the strong QCD theta term. The method is based on the gradient flow for gauge fields and is free from renormalization ambiguities. We test our method by computing the nucleon electric dipole moments in pure Yang-Mills theory at several lattice spacings, enabling a first-of-its-kind continuum extrapolation. The method is rather general and can be applied for any quantity computed in a theta vacuum. This first application of the gradient flow has been successful and demonstrates proof-of-principle, thereby providing a novel method to obtain precise results for nucleon and light nuclear electric dipole moments.

引用

页数：17

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