$ν- K^0$ Analogy, Dirac-Majorana Neutrino Duality and the Neutrino Oscillations

Details $ν- K^0$ Analogy, Dirac-Majorana Neutrino Duality and the Neutrino Oscillations $ν- K^0$ Analogy, Dirac-Majorana Neutrino Duality and the Neutrino Oscillations

2001-03-20

arxiv.org/abs/hep-ph/0103220v2

Int.J.Mod.Phys.A16:4911-4924,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, LaTeX. Minor modifications, new references added

Scientific paper

10.1142/S0217751X01005675

The intent of this paper is to convey a new primary physical idea of a Dirac-Majorana neutrino duality in relation to the topical problem of neutrino oscillations. In view of the new atmospheric, solar and the LSND neutrino oscillation data, the Pontecorvo $\nu - K^0$ oscillation analogy is generalized to the notion of neutrino duality with substantially different physical meaning ascribed to the long-baseline and the short-baseline neutrino oscillations. At the level of CP-invariance, the suggestion of dual neutrino properties defines the symmetric two-mixing-angle form of the widely discussed four-neutrino $(2+2)$-mixing scheme, as a result of the lepton charge conservation selection rule and a minimum of two Dirac neutrino fields. With neutrino duality, the two-doublet structure of the Majorana neutrino mass spectrum is a vestige of the two-Dirac-neutrino origin. The fine neutrino mass doublet structure is natural because it is produced by a lepton charge symmetry violating perturbation on a zero-approximation system of two twofold mass-degenerate Dirac neutrino-antineutrino pairs. A set of inferences related to the neutrino oscillation phenomenology in vacuum is considered.

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