17-keV neutrino, MSW mechanism, and supernova constraints. [SN 1987a]

Journal Article · Wed Jan 01 00:00:00 EST 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.45.R5· OSTI ID:5080848

Babu, K S ^[1]; Mohapatra, R N; Rothstein, I Z ^[2]

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1. Bartol Research Institute, University of Delaware, Newark, Delaware 19716 (United States)
2. Department of Physics, University of Maryland, College Park, Maryland 20742 (United States)

A simple form for the neutrino mass matrix describing {nu}{sub {ital e}}, {nu}{sub {mu}}, {nu}{sub {tau}}, and a sterile state {nu}{sub {ital s}} is proposed which accommodates the 17-keV neutrino as a {nu}{sub {mu}-}{nu}{sub {tau}} pseudo Dirac pair and simultaneously resolves the solar-neutrino puzzle via {nu}{sub {ital e}-}{nu}{sub {ital s}} Mikheyev-Smirnov-Wolfenstein (MSW) oscillation. This model, which is a specific realization of a scheme proposed recently by Caldwell and Langacker, is automatically free of all supernova constraints. It is shown that the mass matrix follows in a technically natural manner in extensions of the standard model with spontaneously broken global U(1){sub {ital L}{ital e}}{minus}{ital L}{sub {mu}}{times}U(1){sub {ital L}{tau}} symmetry. The 17-keV neutrino decays to {nu}{sub {ital e}} and a Majoron with a lifetime of order 10{sup {minus}1}--10{sup {minus}2} sec thus satisfying all cosmological and astrophysical constraints.

• OSTI ID: 5080848
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 45:1; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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