SOME TWO-LOOP CONTRIBUTIONS TO MUON MAGNETIC DIPOLE MOMENT IN THE CP-VIOLATING MSSM

2013 ◽  
Vol 28 (40) ◽  
pp. 1350173 ◽  
Author(s):  
SHU-MIN ZHAO ◽  
FANG WANG ◽  
BIAO CHEN ◽  
TAI-FU FENG ◽  
HAI-BIN ZHANG ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Magnetic Dipole ◽  
Gauge Invariance ◽  
Magnetic Dipole Moment ◽  
Ultra Violet ◽  
Supersymmetric Extension ◽  
Self Energy ◽  
The Standard Model ◽  
The One ◽  
Minimal Supersymmetric Extension

In the CP-violating minimal supersymmetric extension of the Standard Model (MSSM), we study the two-loop diagrams without the one-loop self-energy, and they are composed of virtual neutralino–slepton-Z. We obtain electroweak corrections to the anomalous magnetic dipole moment (MDM) of muon. With electromagnetic gauge invariance, the Wilson coefficients of dimension-5 operators contributing to the MDM of muon are deduced. To remove the ultra-violet divergences induced by the divergent sub-diagrams, we use the on-shell scheme. The numerical results are about 8.8×10-11, i.e. at the same order of present experimental precision, which indicates these two-loop diagrams are important.

THE SUPERSYMMETRIC TWO-LOOP CORRECTIONS TO MUON MAGNETIC DIPOLE MOMENTS IN THE CP-VIOLATING MSSM

2012 ◽  
Vol 27 (14) ◽  
pp. 1250045 ◽  
Author(s):  
SHU-MIN ZHAO ◽  
TAI-FU FENG ◽  
TONG LI ◽  
XUE-QIAN LI ◽  
KE-SHENG SUN
Keyword(s):  
Dipole Moment ◽  
Magnetic Dipole ◽  
Magnetic Dipole Moment ◽  
Dipole Moments ◽  
Ultra Violet ◽  
Supersymmetric Extension ◽  
Effective Lagrangian ◽  
The Standard Model ◽  
Zero Momentum ◽  
Minimal Supersymmetric Extension

Using the effective Lagrangian method, we study the electroweak corrections to the magnetic dipole moment of muon from some special two-loop topological diagrams which are composed of chargino–sneutrino, neutralino–slepton, slepton–sneutrino, in the CP-violating minimal supersymmetric extension of the standard model. Considering the electromagnetic gauge invariance, we obtain the Wilson coefficients of those dimension 6 operators which induce the magnetic dipole moment of leptons. Adopting the zero-momentum substraction scheme, we remove the ultra-violet divergences induced by the divergent sub-diagrams. The numerical results indicate that the two-loop supersymmetric corrections from this sector to the muon magnetic dipole moment can exceed 10-10, which is the same order of present experimental precision.

scholarly journals Muon (g − 2) in the B-LSSM

2021 ◽  
Vol 2021 (8) ◽  
Author(s):  
Jin-Lei Yang ◽  
Hai-Bin Zhang ◽  
Chang-Xin Liu ◽  
Xing-Xing Dong ◽  
Tai-Fu Feng
Keyword(s):  
Dipole Moment ◽  
Higgs Boson ◽  
Standard Model ◽  
Magnetic Dipole ◽  
Magnetic Dipole Moment ◽  
Standard Model Prediction ◽  
Boson Mass ◽  
Experimental Result ◽  
Supersymmetric Model ◽  
The Standard Model

Abstract The difference between the updated experimental result on the muon anomalous magnetic dipole moment and the corresponding theoretical prediction of the standard model on that is about 4.2 standard deviations. In this work, we calculate the muon anomalous MDM at the two-loop level in the supersymmetric B − L extension of the standard model. Considering the experimental constraints on the lightest Higgs boson mass, Higgs boson decay modes h → γγ, WW, ZZ, $$ b\overline{b} $$ b b ¯ , $$ \tau \overline{\tau} $$ τ τ ¯ , B rare decay $$ \overline{B} $$ B ¯ → Xsγ, and the transition magnetic moments of Majorana neutrinos, we analyze the theoretical predictions of the muon anomalous magnetic dipole moment in the B − L supersymmetric model. The numerical analyses indicate that the tension between the experimental measurement and the standard model prediction is remedied in the B − L supersymmetric model.

scholarly journals τ−→ ℓi−ℓi+ℓj−ν̄jντ decays with a magnetic dipole term

2017 ◽  
Vol 32 (33) ◽  
pp. 1750195 ◽  
Author(s):  
M. A. Arroyo-Ureña ◽  
E. Díaz ◽  
O. Meza-Aldama ◽  
G. Tavares-Velasco
Keyword(s):  
Dipole Moment ◽  
Standard Model ◽  
Magnetic Dipole ◽  
Magnetic Dipole Moment ◽  
Branching Ratio ◽  
Experimental Measurements ◽  
Helicity Formalism ◽  
The Standard Model ◽  
Dipole Term

Using the massive helicity formalism, we calculate the five-body average square amplitude of the decays [Formula: see text] [Formula: see text] within the Standard Model (SM), we then introduce a dimension-five effective vertex [Formula: see text] in order to determine the feasibility of imposing limits on the tau anomalous magnetic dipole moment [Formula: see text] via the current or future experimental measurements of the branching ratio for the decay [Formula: see text].

scholarly journals One-loop running of dimension-six Higgs-neutrino operators and implications of a large neutrino dipole moment

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Mikael Chala ◽  
Arsenii Titov
Keyword(s):  
Dipole Moment ◽  
Effective Field Theory ◽  
Magnetic Dipole Moment ◽  
Branching Ratios ◽  
Effective Field ◽  
The Standard Model ◽  
The One ◽  
The Right ◽  
Invisible Decays ◽  
Near Future

Abstract We compute the one-loop running of the dimension-six CP-even Higgs operators in the Standard Model effective field theory involving the right-handed component of the would-be Dirac neutrinos. Then, on the basis of naturalness arguments, for some operators we obtain bounds that surpass direct constraints by orders of magnitude. We also discuss the implications of a large Dirac neutrino magnetic dipole moment. In particular, we demonstrate that a neutrino magnetic moment explaining the recent XENON1T excess induces Higgs and Z invisible decays with branching ratios in the range [10−18, 10−12]. These numbers are unfortunately beyond the reach of current and near future facilities.

scholarly journals Pseudospin versus magnetic dipole moment ordering in the isosceles triangular lattice material K3Er(VO4)2

2020 ◽  
Vol 102 (10) ◽  
Author(s):  
Danielle R. Yahne ◽  
Liurukara D. Sanjeewa ◽  
Athena S. Sefat ◽  
Bradley S. Stadelman ◽  
Joseph W. Kolis ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Magnetic Dipole ◽  
Triangular Lattice ◽  
Magnetic Dipole Moment ◽  
Lattice Material

scholarly journals Stellar activity and magnetic shielding

2009 ◽  
Vol 5 (S264) ◽  
pp. 385-394 ◽  
Author(s):  
J.-M. Grießmeier ◽  
M. Khodachenko ◽  
H. Lammer ◽  
J. L. Grenfell ◽  
A. Stadelmann ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Magnetic Dipole ◽  
Magnetic Dipole Moment ◽  
Direct Interaction ◽  
Planetary Atmosphere ◽  
Stellar Activity ◽  
Planetary Environment ◽  
Atmospheric Loss ◽  
Planetary Magnetic Field ◽  
Planetary Habitability

AbstractStellar activity has a particularly strong influence on planets at small orbital distances, such as close-in exoplanets. For such planets, we present two extreme cases of stellar variability, namely stellar coronal mass ejections and stellar wind, which both result in the planetary environment being variable on a timescale of billions of years. For both cases, direct interaction of the streaming plasma with the planetary atmosphere would entail servere consequences. In certain cases, however, the planetary atmosphere can be effectively shielded by a strong planetary magnetic field. The efficiency of this shielding is determined by the planetary magnetic dipole moment, which is difficult to constrain by either models or observations. We present different factors which influence the strength of the planetary magnetic dipole moment. Implications are discussed, including nonthermal atmospheric loss, atmospheric biomarkers, and planetary habitability.

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