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magnetic correction to the anomalous magnetic moment of electrons

Communications in Theoretical Physics 2022年第5期74卷 75-85页

作者： Fan Lin Mei Huang School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China

We investigate the leading order correction of anomalous magnetic moment(AMM) to electrons in a weak magnetic field and find that the magnetic correction is negative and magnetic field dependent, indicating a magnetic catalysis effect for the electron gas. In the laboratory, to measure the g-2, the magnitude of the magnetic field B is several T, and correspondingly the magnetic correction to the AMM of electron/muon is around 10^(-34)/10^(-42), therefore the magnetic correction can be safely neglected in the current measurement. However, when the magnitude of the magnetic field strength is comparable with the electron mass, the magnetic correction of the electron’s AMM will become considerable. This general magnetic correction to the charged fermion’s AMM can be extended to study quantum chromodynamic matter under a strong magnetic field.

关键词： anomalous magnetic moment magnetic correction magnetic field

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Update of g-2 of the muon and △α

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Chinese Physics C 2010年第6期34卷 728-734页

作者： T.Teubner K.Hagiwara R.Liao A.D.Martin Daisuke Nomura Department of Mathematical Sciences University of Liverpool Theory Center KEK Department of Physics and Institute for Particle Physics Phenomenology University of Durham

We update our Standard Model predictions for g-2 of the muon and for the hadronic contributions （5） 2 to the running of the QED coupling, Δαbad^5）（MZ^2）. Particular emphasis is put on recent changes in the had... 详细信息

关键词： anomalous magnetic moment muon running coupling hadronic contributions

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Hadronic light-by-light scattering contribution to the muon g-2

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Chinese Physics C 2010年第6期34卷 705-711页

作者： A.Nyffeler Regional Centre for Accelerator-based Particle Physics Harish-Chandra Research Institute

We review recent developments concerning the hadronic light-by-light scattering contribution to the anomalous magnetic moment of the muon. We first discuss why fully off-shell hadronic form factors should be used for the evaluation of this contribution to the g- 2. We then reevaluate the numerically dominant pion-exchange contribution in the framework of large-No QCD, using an off-shell pion-photon-photon form factor which fulfills all QCD short-distance constraints, in particular, a new short-distance constraint on the off-shell form factor at the external vertex in g- 2, which relates the form factor to the quark condensate magnetic susceptibility in QCD. Combined with available evaluations of the other contributions to hadronic light-by-light scattering this leads to the new result αμ^LbyL;had= （116±40） × 10^-11, with a conservative error estimate in view of the many still unsolved problems. Some potential ways for further improvements are briefly discussed as well. For the electron we obtain the new estimate αe^LbyL;had= （3.9± 1.3） × 10^-14.

关键词： muon anomalous magnetic moment hadronic contributions effective field theories large-No

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Fine Structure Constant Model Demonstrates the Electron Elementary Charge of Having an Intrinsic Manifold

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Journal of Applied Mathematics and Physics 2022年第10期10卷 2923-2939页

作者： Emmanouil Markoulakis Emmanuel Antonidakis Electronic Engineering Hellenic Mediterranean University Chania Greece

Using our recently published electron’s charge electromagnetic flux manifold fiber model of the electron, described by analytical method and numerical simulations, we show how the fine structure constant is embedded as a geometrical proportionality constant in three dimensional space of its charge manifold and how this dictates the first QED term one-loop contribution of its anomalous magnetic moment making for the first time a connection of its intrinsic characteristics with physical geometrical dimensions and therefore demonstrating that the physical electron charge cannot be dimensionless. We show that the fine structure constant (FSC) α, and anomalous magnetic moment αμ of the electron is related to the sphericity of its charge distribution which is not perfectly spherical and thus has a shape, and therefore its self-confined charge possesses measurable physical dimensions. We also explain why these are not yet able to be measured by past and current experiments and how possible we could succeed.

关键词： Electron Charge Manifold Electron Fiber Model Compton Electron Fine Structure Constant anomalous magnetic moment Electron Dipole moment Classical Electrodynamics Electron Geometry

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