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@ARTICLE{Shi:891856,
      author       = {Shi, Yu-Ji and Seng, Chien-Yeah and Guo, Feng-Kun and
                      Kubis, Bastian and Meißner, Ulf-G. and Wang, Wei},
      title        = {{T}wo-meson form factors in unitarized chiral perturbation
                      theory},
      journal      = {Journal of high energy physics},
      volume       = {2021},
      number       = {4},
      issn         = {1029-8479},
      address      = {[Trieste]},
      publisher    = {SISSA},
      reportid     = {FZJ-2021-01776},
      pages        = {86},
      year         = {2021},
      abstract     = {We present a comprehensive analysis of form factors for two
                      light pseudoscalar mesons induced by scalar, vector, and
                      tensor quark operators. The theoretical framework is based
                      on a combination of unitarized chiral perturbation theory
                      and dispersion relations. The low-energy constants in chiral
                      perturbation theory are fixed by a global fit to the
                      available data of the two-meson scattering phase shifts.
                      Each form factor derived from unitarized chiral perturbation
                      theory is improved by iteratively applying a dispersion
                      relation. This study updates the existing results in the
                      literature and explores those that have not been
                      systematically studied previously, in particular the
                      two-meson tensor form factors within unitarized chiral
                      perturbation theory. We also discuss the applications of
                      these form factors as mandatory inputs for low-energy
                      phenomena, such as the semi-leptonic decays Bs →
                      π+π−ℓ+ℓ− and the τ lepton decay τ →
                      π−π0ντ, in searches for physics beyond the Standard
                      Model.},
      cin          = {IAS-4 / IKP-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-4-20090406 / I:(DE-Juel1)IKP-3-20111104},
      pnm          = {511 - Enabling Computational- Data-Intensive Science and
                      Engineering (POF4-511) / DFG project 196253076 - TRR 110:
                      Symmetrien und Strukturbildung in der Quantenchromodynamik
                      (196253076)},
      pid          = {G:(DE-HGF)POF4-511 / G:(GEPRIS)196253076},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000639403500001},
      doi          = {10.1007/JHEP04(2021)086},
      url          = {https://juser.fz-juelich.de/record/891856},
}