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@ARTICLE{Green:866038,
      author       = {Green, Jeremy R. and Engelhardt, Michael and Hasan, Nesreen
                      and Krieg, Stefan and Meinel, Stefan and Negele, John W. and
                      Pochinsky, Andrew V. and Syritsyn, Sergey N.},
      title        = {{E}xcited-state effects in nucleon structure on the lattice
                      using hybrid interpolators},
      journal      = {Physical review / D},
      volume       = {100},
      number       = {7},
      issn         = {2470-0010},
      address      = {Melville, NY},
      publisher    = {Inst.812068},
      reportid     = {FZJ-2019-05284},
      pages        = {074510},
      year         = {2019},
      abstract     = {It would be very useful to find a way of reducing
                      excited-state effects in lattice QCD calculations of nucleon
                      structure that has a low computational cost. We explore the
                      use of hybrid interpolators, which contain a nontrivial
                      gluonic excitation, in a variational basis together with the
                      standard interpolator with tuned smearing width. Using the
                      clover discretization of the field strength tensor, a
                      calculation using a fixed linear combination of standard and
                      hybrid interpolators can be done using the same number of
                      quark propagators as a standard calculation, making this a
                      cost-effective option. We find that such an interpolator,
                      optimized by solving a generalized eigenvalue problem,
                      reduces excited-state contributions in two-point
                      correlators. However, the effect in three-point correlators,
                      which are needed for computing nucleon matrix elements, is
                      mixed: for some matrix elements such as the tensor charge,
                      excited-state effects are suppressed, whereas for others
                      such as the axial charge, they are enhanced. The results
                      illustrate that the variational method is not guaranteed to
                      reduce the net contribution from excited states except in
                      its asymptotic regime, and suggest that it may be important
                      to use a large basis of interpolators capable of isolating
                      all of the relevant low-lying states.},
      cin          = {JSC / NIC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JSC-20090406 / I:(DE-Juel1)NIC-20090406},
      pnm          = {511 - Computational Science and Mathematical Methods
                      (POF3-511) / The Proton radius and other aspects of nucleon
                      structure from Lattice QCD $(hmz37_20161101)$},
      pid          = {G:(DE-HGF)POF3-511 / $G:(DE-Juel1)hmz37_20161101$},
      typ          = {PUB:(DE-HGF)16},
      eprint       = {1907.11950},
      howpublished = {arXiv:1907.11950},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1907.11950;\%\%$},
      UT           = {WOS:000492369100005},
      doi          = {10.1103/PhysRevD.100.074510},
      url          = {https://juser.fz-juelich.de/record/866038},
}