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@ARTICLE{Dragos:889971,
      author       = {Dragos, Jack and Shindler, Andrea and de Vries, Jordy and
                      Yousif, Ahmed and Luu, Tom},
      title        = {{C}onfirming the existence of the strong {CP} problem in
                      lattice {QCD} with the gradient flo},
      journal      = {Physical review / C},
      volume       = {103},
      number       = {1},
      issn         = {2469-9985},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2021-00574},
      pages        = {015202},
      year         = {2021},
      abstract     = {We calculate the electric dipole moment of the nucleon
                      induced by the quantum chromodynamics θ term. We use the
                      gradient flow to define the topological charge and use
                      Nf=2+1 flavors of dynamical quarks corresponding to pion
                      masses of 700, 570, and 410MeV, and perform an extrapolation
                      to the physical point based on chiral perturbation theory.
                      We perform calculations at three different lattice spacings
                      in the range of 0.07fm<a<0.11fm at a single value of the
                      pion mass, to enable control on discretization effects. We
                      also investigate finite-size effects using two different
                      volumes. A novel technique is applied to improve the
                      signal-to-noise ratio in the form factor calculations. The
                      very mild discretization effects observed suggest a
                      continuumlike behavior of the nucleon electric dipole moment
                      toward the chiral limit. Under this assumption our results
                      read dn=−0.00152(71)¯θefm and dp=0.0011(10)¯θefm.
                      Assuming the θ term is the only source of CP violation, the
                      experimental bound on the neutron electric dipole moment
                      limits ∣∣¯θ∣∣<1.98×10−10 $(90\%$ CL). A first
                      attempt at calculating the nucleon Schiff moment in the
                      continuum resulted in Sp=0.50(59)×10−4¯θefm3 and
                      Sn=−0.10(43)×10−4¯θefm3.},
      cin          = {IAS-4 / JARA-HPC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-4-20090406 / $I:(DE-82)080012_20140620$},
      pnm          = {511 - Enabling Computational- $\&$ Data-Intensive Science
                      and Engineering (POF4-511) / Beyond the Standard Model
                      Matrix Elements from lattice QCD $(jias40_20190501)$},
      pid          = {G:(DE-HGF)POF4-511 / $G:(DE-Juel1)jias40_20190501$},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000608618400008},
      doi          = {10.1103/PhysRevC.103.015202},
      url          = {https://juser.fz-juelich.de/record/889971},
}