Neutrino magnetic moment: a window to new physics

Existence of non-zero neutrino magnetic moment would mean new physics beyond the standard model. A search for the neutrino magnetic moment has been conducted using the high statistic solar neutrino data from Super-Kamiokande-I. This is done by looking for the distortion to the observed energy spectrum of recoil electrons. A non-zero neutrino magnetic moment would cause an increase of event rates at lower energies. The search found no clear signal of neutrino magnetic moment. A limit on the neutrino magnetic moment has been obtained at 3.6 × 10-10μB at 90% C.L. by fitting to the Super-Kamiokande day-night spectra. The effects of neutrino oscillation have been included in the analysis. Including results from other neutrino experiments limiting the oscillation region, a limit of 1.1 × 10-10μB at 90% C.L. was obtained.

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HOW MAGNETIC IS THE NEUTRINO?

International Journal of Modern Physics A ◽

10.1142/s0217751x07038256 ◽

2007 ◽

Vol 22 (27) ◽

pp. 4891-4899 ◽

Cited By ~ 14

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.

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Neutron star kick velocity induced by neutrino chirality flip and a lower bound for the neutrino magnetic moment

Astronomische Nachrichten ◽

10.1002/asna.202113906 ◽

2021 ◽

Author(s):

Alejandro Ayala ◽

Santiago Bernal Langarica ◽

Saul Hernández‐Ortiz ◽

Luis Alberto Hernández ◽

Daryel Manreza‐Paret

Keyword(s):

Neutron Star ◽

Lower Bound ◽

Magnetic Moment ◽

Neutrino Magnetic Moment

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Probing neutrino magnetic moment at the Jinping neutrino experiment

Journal of High Energy Physics ◽

10.1007/jhep08(2021)068 ◽

2021 ◽

Vol 2021 (8) ◽

Author(s):

Baobiao Yue ◽

Jiajun Liao ◽

Jiajie Ling

Keyword(s):

Magnetic Moment ◽

Liquid Scintillator ◽

Solar Neutrinos ◽

Electron Neutrino ◽

Neutrino Experiment ◽

Neutrino Magnetic Moment ◽

Systematic Uncertainties ◽

Electron Recoil ◽

Massive Neutrinos ◽

Highly Correlated

Abstract Neutrino magnetic moment (νMM) is an important property of massive neutrinos. The recent anomalous excess at few keV electronic recoils observed by the XENON1T collaboration might indicate a ∼ 2.2 × 10−11μB effective neutrino magnetic moment ($$ {\mu}_{\nu}^{\mathrm{eff}} $$ μ ν eff ) from solar neutrinos. Therefore, it is essential to carry out the νMM searches at a different experiment to confirm or exclude such a hypothesis. We study the feasibility of doing νMM measurement with 4 kton fiducial mass at Jinping neutrino experiment (Jinping) using electron recoil data from both natural and artificial neutrino sources. The sensitivity of $$ {\mu}_{\nu}^{\mathrm{eff}} $$ μ ν eff can reach < 1.2 × 10−11μB at 90% C.L. with 10-year data taking of solar neutrinos. Besides the abundance of the intrinsic low energy background 14C and 85Kr in the liquid scintillator, we find the sensitivity to νMM is highly correlated with the systematic uncertainties of pp and 85Kr. Reducing systematic uncertainties (pp and 85Kr) and the intrinsic background (14C and 85Kr) can help to improve sensitivities below these levels and reach the region of astrophysical interest. With a 3 mega-Curie (MCi) artificial neutrino source 51Cr installed at Jinping neutrino detector for 55 days, it could give us a sensitivity to the electron neutrino magnetic moment ($$ {\mu}_{\nu_e} $$ μ ν e ) with < 1.1 × 10−11μB at 90% C.L. . With the combination of those two measurements, the flavor structure of the neutrino magnetic moment can be also probed at Jinping.

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