scholarly journals Implications of last NA64 results and the electron ge − 2 anomaly for the X(16.7) boson survival

2020 ◽  
Vol 35 (15) ◽  
pp. 2050116 ◽  
Author(s):  
N. V. Krasnikov
Keyword(s):  
Magnetic Moment ◽  
Vector Boson ◽  
Axial Vector ◽  
Coupling Constant ◽  
Electron Magnetic Moment

We point out that last NA64 bound on coupling constant of hypothetical X[Formula: see text](16.7 MeV) vector boson with electrons plus the recent value of the anomalous electron magnetic moment exclude at 90% C.L. purely vector or axial–vector couplings of X[Formula: see text](16.7) boson with electrons. Models with nonzero [Formula: see text] coupling constant with electron survive and they can explain both the electron and muon [Formula: see text] anomalies.

The electron magnetic moment at high temperature

1982 ◽  
Vol 114 (5) ◽  
pp. 359-362 ◽  
Author(s):  
Yasushi Fujimoto ◽  
Jae Hyung Yee
Keyword(s):  
High Temperature ◽  
Magnetic Moment ◽  
Electron Magnetic Moment

INVESTIGATIONS IN THE LEE–WICK ELECTRODYNAMICS

2011 ◽  
Vol 26 (26) ◽  
pp. 1985-1994 ◽  
Author(s):  
ANTONIO ACCIOLY ◽  
PATRICIO GAETE ◽  
JOSÉ HELAYËL-NETO ◽  
ESLLEY SCATENA ◽  
RODRIGO TURCATI
Keyword(s):  
Gauge Theory ◽  
Elastic Scattering ◽  
Comparative Study ◽  
Magnetic Moment ◽  
Heavy Particle ◽  
Gauge Invariant ◽  
Higher Derivatives ◽  
Electron Magnetic Moment ◽  
Invariant Dimension ◽  
Coulomb Potentials

We consider the Lee–Wick (LW) electrodynamics, i.e. the U(1) gauge theory where a (gauge-invariant) dimension-6 operator containing higher derivatives is added to the free Lagrangian of the U(1) sector. A quantum bound on the LW heavy particle mass is then estimated by computing the anomalous electron–magnetic moment in the context of the aforementioned model. This limit is not only within the allowed range estimated by LW, it is also of the same order as that considered in early investigations on the possible effects of the LW heavy particle in e-e+ elastic scattering. A comparative study between the LW and the Coulomb potentials is also done.

Electron Magnetic Moment from Geonium Spectra

1978 ◽  
pp. 159-181 ◽  
Author(s):  
Robert S. Van Dyck ◽  
Paul B. Schwinberg ◽  
Hans G. Dehmelt
Keyword(s):  
Magnetic Moment ◽  
Electron Magnetic Moment

scholarly journals Enhanced Derivation of the Electron Magnetic Moment Anomaly from the Electron Charge using Geometric Principles

2018 ◽  
Vol 10 (6) ◽  
pp. 24 ◽  
Author(s):  
Andrew Worsley ◽  
J.F. Peters
Keyword(s):  
Fine Structure ◽  
Standard Model ◽  
Magnetic Moment ◽  
Geometric Model ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Electron Charge ◽  
Mathematical Equation ◽  
The Standard Model ◽  
Electron Magnetic Moment

The electron magnetic moment anomaly is conventionally derived from the fine structure constant using a complex formula requiring over 13,000 evaluations. However, the charge of the electron is an important parameter of the Standard Model and could provide an enhanced basis for the derivation of the electron magnetic moment anomaly. This paper uses a geometric model to reformulate the equation for the electron’s charge, this is then used to determine a more accurate value for the electron magnetic moment anomaly from first geometric principles. This enhanced derivation uses a single evaluation, using a concise mathematical equation based on the natural log e^pi. This geometric model will lead to further work to theoretically improve the understanding of the electron.

scholarly journals Electroweak fermion triangle loop contributions to the muon anomalous magnetic moment revisited

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Ken Sasaki
Keyword(s):  
Magnetic Moment ◽  
Top Quark ◽  
Anomalous Magnetic Moment ◽  
Ward Identity ◽  
Axial Vector ◽  
Goldstone Boson ◽  
Muon Anomalous Magnetic Moment ◽  
Feynman Gauge ◽  
Unitary Gauge ◽  
The One

Abstract The contribution to the muon anomalous magnetic moment from the fermion triangle loop diagrams connected to the muon line by a photon and a $Z$ boson is re-analyzed in both the unitary gauge and the ’t Hooft–Feynman gauge. With use of the anomalous axial-vector Ward identity, it is shown that the calculation in the unitary gauge exactly coincides with the one in the ’t Hooft–Feynman gauge. The part which arises from the ordinary axial-vector Ward identity corresponds to the contribution of the neutral Goldstone boson. For the top-quark contribution, the one-parameter integral form is obtained up to the order of $m_\mu^2/m_Z^2$. The results are compared with those obtained by the asymptotic expansion method.

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