arXiv:hep-ph/0212127·v2·High Energy Physics — Phenomenology
Solar neutrino oscillation parameters after first KamLAND results
G.L. Fogli🇮🇹 · E. Lisi🇮🇹 · A. Marrone (U. of Bari and INFN, Bari)🇮🇹 · D. Montanino (U. of Lecce and INFN, Lecce)🇮🇹 · A. Palazzo🇮🇹 · A.M. Rotunno (U. of Bari & INFN, Bari)🇮🇹
Abstract
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.
Comments: Revised version. Two figures added