Light scalars with lepton number to solve the (g−2)e anomaly

  title={Light scalars with lepton number to solve the 
  author={Susan Gardner and X. Yan},
  journal={arXiv: High Energy Physics - Phenomenology},
  • S. Gardner, X. Yan
  • Published 29 July 2019
  • Physics
  • arXiv: High Energy Physics - Phenomenology
Scalars that carry lepton number can help mediate would-be lepton-number-violating processes, such as neutrinoless double $\beta$ decay or lepton-scattering-mediated nucleon-antinucleon conversion. Here we show that such new scalars can also solve the anomaly in precision determinations of the fine-structure constant $\alpha$ from atom interferometry and from the electron's anomalous magnetic moment, $a_e \equiv (g-2)_e/2$, by reducing $|a_e|$. Study of the phenomenological constraints on these… 

Figures from this paper

Electron and muon anomalous magnetic moments in the inverse seesaw extended NMSSM
The recently improved observation of the fine structure constant has led to a negative 2.4σ anomaly of electron g−2. Combined with the long-existing positive 3.7σ discrepancy of the muon anomalous
Model building from asymptotic safety with Higgs and flavor portals
We perform a comprehensive search for Standard Model extensions inspired by asymptotic safety. Our models feature a singlet matrix scalar field, three generations of vector-like leptons, and direct
Anomalous magnetic moments from asymptotic safety
The measurements of the muon and electron anomalous magnetic moments hint at physics beyond the standard model. We explain why asymptotically safe extensions based on an enlarged scalar sector and
Driven one-particle quantum cyclotron
A quantum cyclotron is one trapped electron or positron that occupies only its lowest cyclotron and spin states. A master equation is solved for a driven quantum cyclotron with a QND (quantum
Search for lepton flavour violating muon decay mediated by a new light particle in the MEG experiment
<jats:p>We present the first direct search for lepton flavour violating muon decay mediated by a new light particle X, <jats:inline-formula><jats:alternatives><jats:tex-math>$$\upmu ^+ \rightarrow
Switchable damping for a one-particle oscillator.
The possibility to switch the damping rate for a one-electron oscillator is demonstrated for an electron that oscillates along the magnetic field axis in a Penning trap and a newly developed switch will reduce the linewidth of the cyclotron transition of one-Electron by two orders of magnitude.
Evading Detector Backaction on a Quantum Cyclotron
The state of a one-particle quantum cyclotron can be detected by coupling it to a simple harmonic oscillator. The resulting quantum nondemolition (QND) detection comes at the price of a detector
Solving the electron and muon $$g-2$$ anomalies in $$Z'$$ models
<jats:p>We consider simultaneous explanations of the electron and muon <jats:inline-formula><jats:alternatives><jats:tex-math>$$g-2$$</jats:tex-math><mml:math
Driven Quantum Cyclotron with One Electron or Positron
The first quantum calculation is presented for a harmonic detection oscillator coupled to a one-particle quantum cyclotron - one trapped electron or positron that occupies only its lowest cyclotron
MUonE sensitivity to new physics explanations of the muon anomalous magnetic moment
The MUonE experiment aims at a precision measurement of the hadronic vacuum polarization contribution to the muon g − 2, via elastic muon-electron scattering. Since the current muon g − 2 anomaly


U-boson production in e+ e- annihilations, psi and Upsilon decays, and Light Dark Matter
We recall how a new light gauge boson emerged in Supersymmetric extensions of the Standard Model with an extra singlet superfield, and how it could behave very much as a light pseudoscalar, with the
Nucleon-nucleon bremsstrahlung of dark gauge bosons and revised supernova constraints
We calculate the rate of production of hypothetical light vector bosons (LVBs) from nucleon-nucleon bremsstrahlung reactions in hot and dense matter. We use the soft-radiation approximation and
Phenomenology of scalar leptoquarks
We study the simplest renormalizable scalar leptoquark models where the standard model is augmented only by one additional scalar representation of SU(3)×SU(2)×U(1). The requirement that there be no
Lepton flavour violation in the MSSM
We derive new constraints on the quantities δXYij, X, Y = L,R, which parametrise the flavour-off-diagonal terms of the charged slepton mass matrix in the MSSM. Considering mass and anomalous magnetic
Neutrino Masses and Mixings in Gauge Models with Spontaneous Parity Violation
Unified electroweak gauge theories based on the gauge group SU(2)/sub L/ x SU(2)/sub R/ x U(1)/sub B/-L, in which the breakdown of parity invariance is spontaneous, lead most naturally to a massive
Variations on Photon Vacuum Polarization
I provide updates for the theoretical predictions of the muon and electron anomalous magnetic moments, for the shift in the fine structure constant α(MZ )and for the weak mixing parameter $ \mathop
Neutrino masses, mixings, and oscillations in SU(2)×U(1) models of electroweak interactions
We make a systematic investigation of all simple possibilities of having massive neutrinos in SU(2) x U(1) models of electroweak interactions, without the ad hoc imposition of lepton-number