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R (cross section ratio)

Index R (cross section ratio)

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]

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

Anomalous magnetic dipole moment

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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Bhabha scattering

In quantum electrodynamics, Bhabha scattering is the electron-positron scattering process: There are two leading-order Feynman diagrams contributing to this interaction: an annihilation process and a scattering process.

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Cross section (physics)

When two particles interact, their mutual cross section is the area transverse to their relative motion within which they must meet in order to scatter from each other.

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The electron is a subatomic particle, symbol or, whose electric charge is negative one elementary 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 an electric charge of −1 e and a spin of 1/2, 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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Quantum chromodynamics

In theoretical physics, quantum chromodynamics (QCD) is the theory of the strong interaction between quarks and gluons, the fundamental particles that make up composite hadrons such as the proton, neutron and pion.

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

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

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