Neutron Electric Dipole Moments with Clover Fermions

B. Yoon, Tanmoy Bhattacharya, V. Cirigliano, Rajan Gupta
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引用次数: 5

Abstract

We present preliminary results for the contributions to the neutron EDM arising from the QCD $\theta$-term, the Weinberg three-gluon and the quark chromo-EDM operators from our ongoing lattice calculations using clover valence quarks on the MILC HISQ lattices. We use the gradient-flow technique to smooth the lattices and renormalize the gluonic operators, and use the Schwinger source method to incorporate the quark chromo-EDM interactions in the quark propagator. For the QCD $\theta$-term and the Weinberg three-gluon operator, we report results in the gradient-flow scheme from 8 ensembles at four lattice spacings and three pion masses, including 2 physical pion mass ensembles. For the quark chromo-EDM, unrenormalized results are presented at two lattice spacings, $a=0.12$ and $0.09$ fm, and two pion masses, $M_\pi = 310$ MeV and $220$ MeV.
三叶草费米子的中子电偶极矩
我们提出了QCD $\theta$ -项、Weinberg三胶子和夸克色EDM算子对中子EDM的贡献的初步结果,这些结果来自我们正在进行的晶格计算,使用MILC HISQ晶格上的三叶树价夸克。我们利用梯度流技术对晶格进行光滑处理,对胶子算符进行重整,并利用Schwinger源方法在夸克传播子中引入了夸克色- edm相互作用。对于QCD $\theta$ -项和Weinberg三胶子算符,我们报告了在四个晶格间距和三个介子质量下的8个系综的梯度流格式的结果,其中包括2个物理介子质量系综。对于夸克色edm,在两个晶格间距$a=0.12$和$0.09$ fm和两个介子质量$M_\pi = 310$ MeV和$220$ MeV下得到了非重整化的结果。
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