Large transition magnetic moment of the neutrino from horizontal symmetry

1990 ◽  
Vol 42 (11) ◽  
pp. 3778-3793 ◽  
Author(s):  
K. S. Babu ◽  
Rabindra N. Mohapatra
Keyword(s):  
Magnetic Moment ◽  
Transition Magnetic Moment ◽  
Horizontal Symmetry

scholarly journals Muon g − 2 anomaly and neutrino magnetic moments

2021 ◽  
Vol 2021 (10) ◽  
Author(s):  
K. S. Babu ◽  
Sudip Jana ◽  
Manfred Lindner ◽  
Vishnu P. K.
Keyword(s):  
Magnetic Moment ◽  
Magnetic Moments ◽  
Higgs Doublet ◽  
Unified Framework ◽  
Muon Anomalous Magnetic Moment ◽  
Transition Magnetic Moment ◽  
Horizontal Symmetry ◽  
Electron Recoil ◽  
Scalar Theories ◽  
The Right

Abstract We show that a unified framework based on an SU(2)H horizontal symmetry which generates a naturally large neutrino transition magnetic moment and explains the XENON1T electron recoil excess also predicts a positive shift in the muon anomalous magnetic moment. This shift is of the right magnitude to be consistent with the Brookhaven measurement as well as the recent Fermilab measurement of the muon g − 2. A relatively light neutral scalar from a Higgs doublet with mass near 100 GeV contributes to muon g − 2, while its charged partner induces the neutrino magnetic moment. In contrast to other multi-scalar theories, in the model presented here there is no freedom to control the sign and strength of the muon g − 2 contribution. We analyze the collider tests of this framework and find that the HL-LHC can probe the entire parameter space of these models.

scholarly journals Large neutrino magnetic moments in the light of recent experiments

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
K. S. Babu ◽  
Sudip Jana ◽  
Manfred Lindner
Keyword(s):  
Magnetic Moment ◽  
Magnetic Moments ◽  
Spin Symmetry ◽  
Simplified Model ◽  
Transition Magnetic Moment ◽  
Horizontal Symmetry ◽  
Electron Recoil ◽  
Majorana Neutrinos ◽  
The Difference ◽  
Dependent Mass

Abstract The excess in electron recoil events reported recently by the XENON1T experiment may be interpreted as evidence for a sizable transition magnetic moment $$ {\mu}_{v_e{v}_{\mu }} $$ μ v e v μ of Majorana neutrinos. We show the consistency of this scenario when a single component transition magnetic moment takes values $$ {\mu}_{v_e{v}_{\mu }}\in \left(1.65-3.42\right)\times {10}^{-11}{\mu}_B $$ μ v e v μ ∈ 1.65 − 3.42 × 10 − 11 μ B . Such a large value typically leads to unacceptably large neutrino masses. In this paper we show that new leptonic symmetries can solve this problem and demonstrate this with several examples. We first revive and then propose a simplified model based on SU(2)H horizontal symmetry. Owing to the difference in their Lorentz structures, in the SU(2)H symmetric limit, mν vanishes while $$ {\mu}_{v_e{v}_{\mu }} $$ μ v e v μ is nonzero. Our simplified model is based on an approximate SU(2)H, which we also generalize to a three family SU(3)H-symmetry. Collider and low energy tests of these models are analyzed. We have also analyzed implications of the XENON1T data for the Zee model and its extensions which naturally generate a large $$ {\mu}_{v_e{v}_{\mu }} $$ μ v e v μ with suppressed mν via a spin symmetry mechanism, but found that the induced $$ {\mu}_{v_e{v}_{\mu }} $$ μ v e v μ is not large enough to explain recent data. Finally, we suggest a mechanism to evade stringent astrophysical limits on neutrino magnetic moments arising from stellar evolution by inducing a medium-dependent mass for the neutrino.

On the possibility of measuring the ∑o - Λ transition magnetic moment in the reaction π−p → ΛKoγ

1968 ◽  
Vol 5 (3) ◽  
pp. 463-478 ◽  
Author(s):  
L.A. Kondratyuk ◽  
L.A. Ponomarev ◽  
V.I. Zakharov
Keyword(s):  
Magnetic Moment ◽  
Transition Magnetic Moment

ON THE Σ0→Λ0 TRANSITION MAGNETIC MOMENT IN THE EFFECTIVE QUARK MODEL WITH CHIRAL SYMMETRY

2007 ◽  
Vol 22 (30) ◽  
pp. 2265-2272 ◽  
Author(s):  
A. YA. BERDNIKOV ◽  
YA. A. BERDNIKOV ◽  
A. N. IVANOV ◽  
V. A. IVANOVA ◽  
A. V. NIKITCHENKO ◽  
...  
Keyword(s):  
Quark Model ◽  
Chiral Symmetry ◽  
Magnetic Moment ◽  
Sum Rules ◽  
Quark Condensate ◽  
Spontaneous Breaking ◽  
Dominant Contribution ◽  
Transition Magnetic Moment ◽  
Nuclear Magneton

We calculate the Σ0→Λ0 transition magnetic moment μΣ0Λ0 in the effective quark model with chiral U (3) × U (3) symmetry.5 We find that the dominant contribution is proportional to the quark condensate that indicates the important role of spontaneous breaking of chiral symmetry for its formation. Our result μΣ0Λ0 = -1.62 μN, where μN is a nuclear magneton, agrees well with the experimental data [Formula: see text]. It also agrees well both quantitatively and qualitatively with the result, obtained in the QCD sum rules approach |μΣ0Λ0| = (1.60±0.30)μN,3 where the dominant contribution is proportional to the quark condensate as well.

scholarly journals Probing neutrino dipole portal at COHERENT experiment

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Arnab Dasgupta ◽  
Sin Kyu Kang ◽  
Jihn E. Kim
Keyword(s):  
Statistical Analysis ◽  
Standard Model ◽  
Neutrino Mass ◽  
Magnetic Moment ◽  
Sterile Neutrino ◽  
Liquid Argon ◽  
Sterile Neutrinos ◽  
Transition Magnetic Moment ◽  
The Standard Model ◽  
Nucleus Scattering

Abstract Motivated by the first observation of coherent-elastic neutrino-nucleus scattering at the COHERENT experiment, we confront the neutrino dipole portal giving rise to the transition of the standard model neutrinos to sterile neutrinos with the recently released CENNS 10 data from the liquid argon as well as the CsI data of the COHERENT experiment. Performing a statistical analysis of those data, we show how the transition magnetic moment can be constrained for the range of the sterile neutrino mass between 10 keV and 40 MeV.

scholarly journals Transition magnetic moment of Majorana neutrinos in the μνSSM

2014 ◽  
Vol 2014 (2) ◽  
Author(s):  
Hai-Bin Zhang ◽  
Tai-Fu Feng ◽  
Zhao-Feng Ge ◽  
Shu-Min Zhao
Keyword(s):  
Magnetic Moment ◽  
Transition Magnetic Moment ◽  
Majorana Neutrinos

scholarly journals The Σ0Λ transition magnetic moment in light cone QCD sum rules

2001 ◽  
Vol 516 (3-4) ◽  
pp. 299-306 ◽  
Author(s):  
T.M. Aliev ◽  
A. Özpineci ◽  
M. Savcı
Keyword(s):  
Magnetic Moment ◽  
Light Cone ◽  
Sum Rules ◽  
Qcd Sum Rules ◽  
Transition Magnetic Moment
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