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 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

scholarly journals HOW MAGNETIC IS THE NEUTRINO?

2007 ◽  
Vol 22 (27) ◽  
pp. 4891-4899 ◽  
Author(s):  
N. F. BELL
Keyword(s):  
Neutrino Mass ◽  
Magnetic Moment ◽  
Magnetic Moments ◽  
New Physics ◽  
Upper Bounds ◽  
Radiative Corrections ◽  
Neutrino Magnetic Moment ◽  
Majorana Neutrinos ◽  
Model Independent ◽  
Moment Bounds

The existence of a neutrino magnetic moment implies contributions to the neutrino mass via radiative corrections. We derive model-independent "naturalness" upper bounds on the magnetic moments of Dirac and Majorana neutrinos, generated by physics above the electroweak scale. For Dirac neutrinos, the bound is several orders of magnitude more stringent than present experimental limits. However, for Majorana neutrinos the magnetic moment bounds are weaker than present experimental limits if μν is generated by new physics at ~ 1 TeV , and surpass current experimental sensitivity only for new physics scales > 10 – 100 TeV . The discovery of a neutrino magnetic moment near present limits would thus signify that neutrinos are Majorana particles.

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 EFFECTS OF NEUTRINO OSCILLATION ON THE SUPERNOVA RELIC NEUTRINO BACKGROUND

1996 ◽  
Vol 05 (05) ◽  
pp. 519-527 ◽  
Author(s):  
TOMONORI TOTANI ◽  
KATSUHIKO SATO
Keyword(s):  
Energy Range ◽  
Neutrino Oscillation ◽  
Magnetic Moment ◽  
Upper Bound ◽  
Event Rate ◽  
High Energy ◽  
Mass Hierarchy ◽  
Majorana Neutrinos ◽  
Standard Calculation ◽  
Neutrino Background

We investigate to what extent the oscillation or conversion of neutrinos enhances the expected event rate of the supernova relic neutrino background (SRN) at the SuperKamiokande detector (SK). The SRN [Formula: see text] can be almost completely exchanged with vμ-like neutrinos by the MSW oscillation under the inverse mass hierarchy with Δm2~ 10−8–105[eV2], or by the magnetic moment of Majorana neutrinos with μv≳10−12μB and Δm2~10−4–10° [eV2]. In the standard calculation of the SRN flux, the event rate of the SRN [Formula: see text] at the SK in the observable energy range of 15–40 MeV can be enhanced from 1.2 yr−1 to 2.4 yr−1 if all [Formula: see text] are exchanged with vμ-like neutrinos. The enhancement is prominent especially in the high energy range (≳ 25 MeV). In the astrophysically optimistic calculation, the event rate becomes as high as 9.4 yr−1. Because the theoretical upper bound of the SRN events without oscillation is about 5 yr−1 taking into account the various astrophysical uncertainties, we might have to resort to the neutrino oscillation if more than 5 events in a year, as well as a significantly harder spectrum, were observed in the SK.

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

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
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