Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2008-10-20
Physics
High Energy Physics
High Energy Physics - Experiment
Parallel talk at ICHEP08, Philadelphia, USA, July 2008. 4 pages, LaTeX, 3 eps figures
Scientific paper
The main goal of the KamLAND reactor electron anti-neutrino experiment is a search for electron anti-neutrino oscillation using inverse-beta decay reaction in 1,000 ton of ultra-pure liquid scintillator. The data-set is 1490.8 days from Mar. 2002 to May 2007. The best-fit oscillation parameters are Delta m^{2}_{21} = 7.58^{+0.14}_{-0.13} (stat.) +/- 0.15 (syst.) x 10$^{-5} eV^{2} and tan^{2}theta_{12} = 0.56^{+0.10}_{-0.07} (stat.) ^{+0.10}_{-0.06} (syst.). The statistical significance for reactor electron anti-neutrino disappearance is 8.8 sigma, and an undistorted electron anti-neutrino energy spectrum is disfavored at > 5 sigma.
for the KamLAND Collaboration
Ichimura Koichi
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