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VOLUME 49 (1989) | ISSUE 5 | PAGE 254
Change in the helicity of neutrinos in a dense plasma
A change in the helicity of a Dirac neutrino in the course of an electromagnetic scattering by nuclei becomes possible in a dispersive medium in the symmetric electroweak model SU^ (2) g> SUR (2)»U(1) (to which right-handed currents are added). This change in helicity is unrelated to the existence of a vacuum anomalous magnetic moment, but it is a more effective mechanism for the sterilization of soft neutrinos with energies E4pF , where pF is the Fermi momentum of the electrons of the medium. A new limitation on the mixing parameter of the left-handed and right-handed bosons WL R is found on the basis of this model.