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@ARTICLE{Krebs:889262,
      author       = {Krebs, Hermann and Epelbaum, E. and Meißner, U.-G.},
      title        = {{B}ox diagram contribution to the axial two-nucleon
                      current},
      journal      = {Physical review / C},
      volume       = {101},
      number       = {5},
      issn         = {2469-9985},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2021-00167},
      pages        = {055502},
      year         = {2020},
      abstract     = {Recently, we have worked out the axial two-nucleon current
                      operator to leading one-loop order in chiral effective field
                      theory using the method of unitary transformation. Our final
                      expressions, however, differ from the ones derived by the
                      JLab-Pisa group using time-ordered perturbation theory
                      [Phys. Rev. C 93, 015501 (2016); Phys. Rev. C 93, 049902(E)
                      (2016); Phys. Rev. C 95, 059901(E) (2017)]. In this paper we
                      consider the box diagram contribution to the axial current
                      and demonstrate that the results obtained using the two
                      methods are unitary equivalent at the Fock-space level. We
                      adjust the unitary phases by matching the corresponding
                      two-pion exchange nucleon-nucleon potentials and rederive
                      the box diagram contribution to the axial current operator
                      following the approach of the JLab-Pisa group, thereby
                      reproducing our original result. We provide a detailed
                      information on the calculation of the box diagram including
                      the relevant intermediate steps in order to facilitate a
                      clarification of this disagreement.},
      cin          = {IAS-4 / IKP-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-4-20090406 / I:(DE-Juel1)IKP-3-20111104},
      pnm          = {511 - Computational Science and Mathematical Methods
                      (POF3-511) / DFG project 196253076 - TRR 110: Symmetrien und
                      Strukturbildung in der Quantenchromodynamik (196253076)},
      pid          = {G:(DE-HGF)POF3-511 / G:(GEPRIS)196253076},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000530027200005},
      doi          = {10.1103/PhysRevC.101.055502},
      url          = {https://juser.fz-juelich.de/record/889262},
}