Full QCD calculation of neutron electric dipole moment with the external electric field method
Full QCD calculation of neutron electric dipole moment with the external electric field method
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DOI：
10.1103/physrevd.78.014503
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发表时间：
2008-03
影响因子：
5
通讯作者：
E. Shintani;S. Aoki;S. Aoki;Y. Kuramashi
中科院分区：
文献类型：
--
作者：
E. Shintani;S. Aoki;S. Aoki;Y. Kuramashi
用外电场方法计算了具有双味动力学三叶草夸克的晶格QCD中违反数学项的Cp存在时的中子电偶极矩(EDM)。通过对16个不同源点和正反向核子传播子的平均积累大量的统计数据，我们得到了全QCD中每个夸克质量超过1个标准差的中子和质子电火花加工的非零信号。我们研究了全QCD中核子EDM的夸克质量依赖关系，发现全QCD中的核子EDM并没有向手性极限方向减小，这与理论上的预期相反。我们简要讨论了这种行为的可能原因。
We have calculated the neutron electric dipole moment (EDM) in the presence of the $CP$ violating $\ensuremath{\theta}$ term in lattice QCD with two-flavor dynamical clover quarks, using the external electric field method. Accumulating a large number of statistics by the averages over 16 different source points and over forward and backward nucleon propagators, we have obtained nonzero signals of neutron and proton EDM beyond 1 standard deviation at each quark mass in full QCD. We have investigated the quark mass dependence of nucleon EDM in full QCD, and have found that nucleon EDM in full QCD does not decrease toward the chiral limit, as opposed to the theoretical expectation. We briefly discuss possible reasons for this behavior.