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Spencer N. Axani, MIT
Determining if the neutrino is its own antiparticle is one of the most pressing questions in modern day elementary particle physics. It has far reaching implications rivaling that of neutrino oscillation -- the only evidentiary physics beyond the Standard Model. We can answer this question with the observation of an ultra-rare decay called "neutrinoless double beta decay." The relentless push for new detector technologies and background reduction techniques has finally brought us to the potential for discovery in the near future. However, if we observe this decay, to understand its full meaning will require us to also answer the question of how many neutrino species exist. This talk presents two of the worlds most sensitive searches for new neutrino physics hoping to resolve these questions: a low-energy search for neutrinoless double beta decay with the KamLAND detector in Japan, and a unique high-energy search for a new neutrino state using the IceCube detector at the South Pole.