Abstract
We review the present status of global analyses of neutrino oscillations, taking into account the most recent neutrino data including the latest KamLAND and K2K updates presented at Neutrino 2004, as well as state-of-the-art solar and atmospheric neutrino flux calculations. We give the two-neutrino solar + KamLAND results, and the two-neutrino atmospheric + K2K oscillation regions, discussing in each case the robustness of the oscillation interpretation against departures from the Standard Solar Model and the possible existence of non-standard neutrino physics. Furthermore, we give the best-fit values and allowed ranges of the three-flavour oscillation parameters from the current worlds' global neutrino data sample and discuss in detail the status of the small parameters α ≡ ΔmSOL2/ΔmATM2 as well as sin2 θ13, which characterize the strength of CP violating effects in neutrino oscillations. We also update the degree of rejection of four-neutrino interpretations of the LSND evidence in view of the most recent developments.
Highlights
We have given a brief review of the status of global analyses of neutrino oscillations, taking into account the latest neutrino data, including the most recent updates of KamLAND and K2K presented at Neutrino2004, as well as state-of-the-art solar and atmospheric neutrino flux calculations
We presented two-neutrino solar + KamLAND results, as well as two-neutrino atmospheric + K2K oscillation regions, and a discussion in each case of the robustness with which the oscillation hypothesis can be established, in view of possible modifications
As case studies we have mentioned the robustness of the solar neutrino oscillation hypothesis vis a vis the possible existence of radiative-zone solar density fluctuations, nonzero convective–zone solar magnetic fields and neutrino transition magnetic moments
Summary
The discovery of neutrino masses by the combination of a variety of data from solar [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], atmospheric [11, 12, 13], reactor [14, 15] and accelerator [16, 17] neutrino experiments was the major recent achievement in astroparticle, high energy, and nuclear physics, which culminates a heroic effort dating back to about four decades This has firmly established the incompleteness of the Standard Model of electroweak interactions, expected on theoretical grounds since long ago [18, 19, 20, 21, 22]. A detailed discussion of the recent KamLAND results is given in Appendix A
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