Electromagnetic properties of neutrinos

Abstract

A short review on electromagnetic properties of neutrinos is presented. In spite of many efforts in the theoretical and experimental studies of neutrino electromagnetic properties, they still remain one of the main puzzles related to neutrinos.

Upper limit on the neutrino magnetic moment from three years of data from the GEMMA spectrometer

“…The Minimally Extended Standard Model predicts a very small magnetic moment for the massive neutrino (µ ν ∼ 10 −20 µ B ) which cannot be observed in any experiment at present. On the other hand, there is a number of extensions of the theory beyond the Minimal Standard Model where the Majorana neutrino magnetic moment (NMM) could be at a level of 10 −(10...12) µ B irrespectively of the neutrino mass [1,2,3,4,5,6,7,8]. At the same time, from general considerations [9,10] it follows that the Dirac NMM cannot exceed 10 −14 µ B .…”

“…At the same time, from general considerations [9,10] it follows that the Dirac NMM cannot exceed 10 −14 µ B . Therefore, observation of the NMM value higher than 10 −14 µ B would be evidence for New Physics and, in addition, would indicate [11,6,7,8] doubtless that the neutrino is a Majorana particle.…”

A QFT-induced phase in neutrino flavour oscillations

“…The physics of the neutrino magnetic moment have been extensively studied in the forms of spin precession in magnetic fields and the helicity-flipping scattering amplitudes [11][12][13][14][15][16][17][18][19][20][21][22].…”