algebraic quantum field theory (perturbative, on curved spacetimes, homotopical)
quantum mechanical system, quantum probability
interacting field quantization
In particle physics and specifically within effective field theories such as quantum hadrodynamics, the form factor of a given bound state is the ratio of its actual differential cross section? for a given scattering process, by that of an actually pointlike particle
Review:
Brambilla et al., Section 3.2.5 of: QCD and strongly coupled gauge theories - challenges and perspectives, Eur Phys J C Part Fields. 2014; 74(10): 2981 (arXiv:1404.3723, doi:10.1140/epjc/s10052-014-2981-5)
M. Kunkel, slide 6 of: Dalitz Decays of Pseudo-Scalar Mesons (pdf)
See also
Hadronic form factors in relation to the flavour anomalies:
Sébastien Descotes-Genon, Alexander Khodjamirian, Javier Virto, Light-Cone Sum Rules for $B \to K \pi$ Form Factors and Applications to Rare Decays (arXiv:1908.02267)
Sebastien Descotes-Genon, Light-cone sum rules for $B \to K \pi$ form factors and applications to rare decays, talk at bsll2019 (pdf, pdf)
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