Solar neutrino oscillation parameters after first KamLAND results

Details Solar neutrino oscillation parameters after first KamLAND results Solar neutrino oscillation parameters after first KamLAND results

2002-12-09

arxiv.org/abs/hep-ph/0212127v2

Phys.Rev.D67:073002,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

Revised version. Two figures added

Scientific paper

10.1103/PhysRevD.67.073002

We analyze the energy spectrum of reactor neutrino events recently observed in the Kamioka Liquid scintillator Anti-Neutrino Detector (KamLAND) and combine them with solar and terrestrial neutrino data, in the context of two- and three-family active neutrino oscillations. In the 2-neutrino case, we find that the solution to the solar neutrino problem at large mixing angle (LMA) is basically split into two sub-regions, that we denote as LMA-I and LMA-II. The LMA-I solution, characterized by lower values of the squared neutrino mass gap, is favored by the global data fit. This picture is not significantly modified in the 3-neutrino mixing case. A brief discussion is given about the discrimination of the LMA-I and LMA-II solutions with future KamLAND data. In both the 2- and 3-neutrino cases, we present a detailed analysis of the post-KamLAND bounds on the oscillation parameters.

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