A Strategy for Accelerator-Based Neutrino Physics in the USA

We outline a strategy for next-generation neutrino physics experiments based on beams from accelerators in North America. This strategy is based on the mounting evidence in favor of the large mixing angle solution to solar neutrino problem [1], which implies that in addition to measurement of sin 2θ13 and of the sign of ∆m 2 23, measurement of CP violation in the neutrino sector is a realizable goal provided sin 2θ13 is not too small The strategy is to begin with a new detector, 20-30 kton of liquid argon, designed to make best use of the NUMI beam currently under construction at FNAL. Then, after new measurements have made the optimal path clearer, we anticipate choosing among options for neutrino “superbeam” upgrades at BNL and/or FNAL as well as for second new detector of 100-200 kton.