A three-flavor oscillation analysis of a new KamLAND data set

KamLAND is a one kilo-ton liquid scintillator anti-neutrino detector which studies reactor-$\bar{\nu}_{e}s$ with an average baseline of $\sim 180\,\rm{km}$. The experiment was the first to report reactor-$\bar{\nu}_{e}$ disappearance and distortion of the $\bar{\nu}_{e}$ spectrum -- the fingerprint of mass-driven flavor oscillation -- and is uniquely sensitive to the mixing parameter $\Delta m^{2}_{21}$ . I will present the results of a three-flavor oscillation analysis based on the most recent data set which amounts to a total exposure of $3.49 \times 10^{32}$ proton-years and includes data collected with more favorable background conditions achieved by a detector radio-purity upgrade. Finally the results of a global analysis including reactor, solar, atmospheric and long-baseline accelerator oscillation data and the emerging weak constraints on $\theta_{13}$ will be presented.