Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-11-18
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, 6 figures, Talk presented by T. Schwetz at AHEP 2003, Oct. 14-18, 2003, Valencia, Spain
Scientific paper
We present an analysis of the global neutrino oscillation data including the LSND result in terms of four-neutrino mass schemes and a CPT violating three-neutrino framework. We find that the strong preference of oscillations into active neutrinos implied by recent solar+KamLAND as well as atmospheric neutrino data allows to rule out (2+2) mass schemes at 5.8$\sigma$, whereas (3+1) schemes are disfavoured at the 3.2$\sigma$ level by short-baseline experiments. The CPT violating scenario is disfavoured at 3.4$\sigma$ by KamLAND and atmospheric anti-neutrino data. We conclude that currently no convincing explanation for the LSND signal exists, and it remains a puzzle how to reconcile it with the other evidences for neutrino oscillations.
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