Weak-scale seesaw model for the 17-keV neutrino

Details Weak-scale seesaw model for the 17-keV neutrino Weak-scale seesaw model for the 17-keV neutrino

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phrvd..46..374b&link_type=abstract

Physical Review D (Particles and Fields), Volume 46, Issue 1, 1 July 1992, pp.374-380

Astronomy and Astrophysics

Astrophysics

7

Quark And Lepton Masses And Mixing, Elementary Particle Processes

Scientific paper

We present variants of the singlet-Majoron model with the seesaw mechanism effective at the weak scale that accommodate the recently reported 17-keV neutrino (ν17) naturally. First, we show that within the minimal model, by assuming an unbroken global le-lμ+lτ symmetry (li==ith lepton number), ν17 can be identified as a Dirac particle composed of ντ and ν¯μ. It is then shown that, with the same spectrum, if the le-lμ+lτ symmetry is broken spontaneously below the weak scale, νe-νs (νs stands for sterile neutrino) oscillations can account for the solar-neutrino deficit via the Mikheyev-Smirnov-Wolfenstein (MSW) mechanism. We also derive a recently proposed mass matrix for the 17-keV neutrino, which features νe-νs MSW oscillations, within the context of the seesaw model. All known constraints from cosmology and astrophysics, including the supernova constraint on the mass of ν17, are satisfied in these variants.

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