Vector meson dominance
Encyclopedia
In physics, vector meson dominance was a model developed by J. J. Sakurai
J. J. Sakurai
was a Japanese-American particle physicist and theorist. He authored the popular graduate text Modern Quantum Mechanics and other texts such as Invariance Principles and Elementary Particles and Advanced Quantum Mechanics ....

 in the 1960s before the advent of QCD in order to describe interactions between photon
Photon
In physics, a photon is an elementary particle, the quantum of the electromagnetic interaction and the basic unit of light and all other forms of electromagnetic radiation. It is also the force carrier for the electromagnetic force...

s and hadron
Hadron
In particle physics, a hadron is a composite particle made of quarks held together by the strong force...

ic matter. In particular the hadronic components of the photon polarization tensor consist of the lightest vector mesons and . Therefore interactions between photons and hadronic matter occur by the exchange of a hadron between the dressed photon and the hadronic target.

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