Combining first KamLAND results with solar neutrino data

Abstract

We consider the impact of the recent KamLAND data on neutrino oscillations, the first terrestrial neutrino experiment that can probe the solar neutrino anomaly. By combining the first 145.1 days of KamLAND data with the full sample of latest solar neutrino data we find an enhanced rejection against non-LMA oscillations, allowed only at more than 4 sigma with respect to LMA. Furthermore, the new data have a strong impact in narrowing down the allowed range of Delta_m^2 inside the LMA region. In contrast, our global analysis indicates that the new data have little impact on the location of the best fit point. In particular the solar neutrino mixing remains significantly non-maximal (3 sigma).

5 pages, LaTeX file using RevTEX4, 4 figures included. Added a section comparing Gaussian and Poisson statistical analyses of KamLAND data

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• First Results from KamLAND: Evidence for Reactor Anti-Neutrino Disappearance
• Constraining Majorana neutrino electromagnetic properties from the LMA-MSW solution of the solar neutrino problem
• Solar neutrino oscillations and bounds on neutrino magnetic moment and solar magnetic field
• Large mixing angle oscillations as a probe of the deep solar interior
• Solar neutrino oscillations and indications of matter effects in the Sun
• KamLAND, solar antineutrinos and their magnetic moment
• Standard and non-standard neutrino properties

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