First Results from KamLAND.

The KamLAND collaboration recently published the first evidence for reactor antineutrino disappearance. The measured ratio of observed inverse β-decay events to the number expected from standard assumptions about ve propagation is 0.611±0.085(stat)±0.041(syst). Fewer ve’s were seen than expected at the 99.95% confidence level. In the context of two-flavor neutrino oscillations and CPT invariance, this measurement rules out all but the LMA region of solar neutrino oscillation parameter space. I summarize these first results and discuss the prospects for future oscillation measurements at KamLAND. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]