P. C. de Holanda

Theory of neutrinos: a white paper

This paper is a review of the present status of neutrino mass physics, which grew out of an APS sponsored study of neutrinos in 2004. After a discussion of the present knowledge of neutrino masses and mixing and some popular ways to probe the new physics implied by recent data, it summarizes what can be learned about neutrino interactions as well as the nature of new physics beyond the Standard Model from the various proposed neutrino experiments. The intriguing possibility that neutrino mass physics may be at the heart of our understanding of a long standing puzzle of cosmology, i.e. the origin of matter?antimatter asymmetry is also discussed.

Status of the solution to the solar neutrino problem based on nonstandard neutrino interactions

We analyze the current status of the solution to the solar neutrino problem based both on (a) nonstandard flavor-changing neutrino interactions (FCNI) and (b) nonuniversal flavor diagonal neutrino interactions (FDNI). We find that FCNI and FDNI with matter in the Sun as well as in the Earth provide a good fit not only to the total rate measured by all solar neutrino experiments but also to the day-night and seasonal variations of the event rate, as well as the recoil electron energy spectrum measured by the SuperKamiokande Collaboration. This solution does not require massive neutrinos and neutrino mixing in vacuum. Stringent experimental constraints on FCNI from bounds on lepton flavor violating decays and on FDNI from limits on lepton universality violation rule out

Homestake result, sterile neutrinos, and low energy solar neutrino experiments

{\ensuremath{\nu}}_{e}\ensuremath{\rightarrow}{\ensuremath{\nu}}_{\ensuremath{\mu}}

Solar neutrinos: the SNO salt phase results and physics of conversion

transitions induced by new physics as a solution to the solar neutrino problem. However, a solution involving

Global analysis of the post-SNO solar neutrino data for standard and nonstandard oscillation mechanisms

{\ensuremath{\nu}}_{e}\ensuremath{\rightarrow}{\ensuremath{\nu}}_{\ensuremath{\tau}}

Massless “just-so” solution to the solar neutrino problem

transitions is viable and could be tested independently by the upcoming B factories if flavor violating tau decays would be observed at a rate close to the present upper bounds.

Neutrino decay and solar neutrino seasonal effect

The Homestake result is about

Probing long-range leptonic forces with solar and reactor neutrinos

\ensuremath{\sim}2\ensuremath{\sigma}

Constraining the violation of the equivalence principle with IceCube atmospheric neutrino data

lower than the Ar-production rate,

Possible scenario for MaVaN's as the only neutrino flavor conversion mechanism in the Sun

{Q}_{\mathrm{Ar}},