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@ARTICLE{Giusti:1048505,
      author       = {Giusti, Davide and Kane, Christopher F. and Lehner,
                      Christoph and Meinel, Stefan and Soni, Amarjit},
      title        = {{E}fficient lattice {QCD} computation of
                      radiative-leptonic-decay form factors at multiple positive
                      and negative photon virtualities},
      journal      = {Physical review / D},
      volume       = {112},
      number       = {5},
      issn         = {2470-0010},
      address      = {Ridge, NY},
      publisher    = {American Physical Society},
      reportid     = {FZJ-2025-04690},
      pages        = {054507},
      year         = {2025},
      abstract     = {In previous work [D. Giusti, et al., Methods for
                      high-precision determinations of radiative-leptonic decay
                      form factors using lattice QCD, Phys. Rev. D 107, 074507
                      (2023)], we showed that form factors for radiative leptonic
                      decays of pseudoscalar mesons can be determined efficiently
                      and with high precision from lattice QCD using the
                      “three-dimensional (3D) method,” in which three-point
                      functions are computed for all values of the current
                      insertion time and the time integral is performed at the
                      data-analysis stage. Here, we demonstrate another benefit of
                      the 3D method: the form factors can be extracted for any
                      number of nonzero photon virtualities from the same
                      three-point functions at no extra cost. We present results
                      for the 𝐷𝑠 →ℓ⁢𝜈⁢𝛾* vector form factor as
                      a function of photon energy and photon virtuality, for both
                      positive and negative virtuality, for a single ensemble with
                      340 MeV pion mass and 0.11 fm lattice spacing. In our
                      analysis, we separately consider the two different time
                      orderings and the different quark flavors in the
                      electromagnetic current. We discuss in detail the behavior
                      of the unwanted exponentials contributing to the three-point
                      functions, as well as the choice of fit models and fit
                      ranges used to remove them for various values of the
                      virtuality. While positive photon virtuality is relevant for
                      decays to multiple charged leptons, negative photon
                      virtuality suppresses soft contributions and is of interest
                      in QCD-factorization studies of the form factors.},
      cin          = {JSC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JSC-20090406},
      pnm          = {5111 - Domain-Specific Simulation $\&$ Data Life Cycle Labs
                      (SDLs) and Research Groups (POF4-511)},
      pid          = {G:(DE-HGF)POF4-5111},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1103/2pzm-v26v},
      url          = {https://juser.fz-juelich.de/record/1048505},
}