R is the ratio of the hadronic cross section to the muon cross section in electron–positron collisions: where the superscript (0) indicates that the cross section has been corrected for initial state radiation. ^{[1]}

8 relations: Anomalous magnetic dipole moment, Cross section (physics), Electron, Hadron, Muon, Positron, Quantum chromodynamics, Quark.

In quantum electrodynamics, the anomalous magnetic moment of a particle is a contribution of effects of quantum mechanics, expressed by Feynman diagrams with loops, to the magnetic moment of that particle.

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The cross section is an effective area that quantifies the intrinsic likelihood of a scattering event when an incident beam strikes a target object, made of discrete particles.

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The electron is a subatomic particle, symbol or, with a negative elementary electric charge.

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In particle physics, a hadron (ἁδρός, hadrós, "stout, thick") is a composite particle made of quarks held together by the strong force (in a similar way as molecules are held together by the electromagnetic force).

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The muon (from the Greek letter mu (μ) used to represent it) is an elementary particle similar to the electron, with electric charge of −1 e and a 2, but with a much greater mass.

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The positron or antielectron is the antiparticle or the antimatter counterpart of the electron.

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In theoretical physics, quantum chromodynamics (QCD) is the theory of strong interactions, a fundamental force describing the interactions between quarks and gluons which make up hadrons such as the proton, neutron and pion.

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A quark is an elementary particle and a fundamental constituent of matter.

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## References

[1] https://en.wikipedia.org/wiki/R_(cross_section_ratio)