nLab form factor

Idea

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

Related concepts

• vector meson dominance

References

General

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)

• Yong-Hui Lin, Hans-Werner Hammer, Ulf-G. Meißner: Baryon Form Factors, in: Encyclopedia of Particle Physics [arXiv:2412.12885]

See also

• Wikipedia, Form_factor_(quantum_field_theory)

In relation to flavour anomalies

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)

Via holographic QCD

via holographic QCD:

for nucleons:

• Kiminad A. Mamo, Ismail Zahed, Nucleon mass radii and distribution: Holographic QCD, Lattice QCD and GlueX data [arXiv:2103.03186]

• Antti Hippeläinen, Niko Jokela, Matti Järvinen: Gravitational form factors of the proton in the improved holographic QCD model [arXiv:2601.14939]