Speaker
Description
Long-baseline neutrino oscillation experiments have been playing an important role to study the neutrino mixings. There are approved next generation experiments that will perform oscillation studies with unprecedented statistical precision, including the leptonic CP violation searches. To be able to take advantage of the high statistics, it is essential to improve constraints on event rate predictions compared to the ones that have been produced by the currently operating experiments, such as the NOvA and T2K experiments. In these experiments, near detectors are fixed to the same off-axis angle as their far detector and measure both beam neutrino fluxes going to their far detector and neutrino-nucleus cross-sections in a degenerated way. Results of such measurements are used to constrain uncertainties on event rate predictions at far detector. Since this type of approach suffers from unavoidable flux difference between near and far detectors due to oscillation effects, it is challenging for fixed detectors to produce constraints with precisions required by the next generation experiments. To this end, a concept of moving near detectors has been adopted by the next generation experiments. This talk will describe the difficulties in event rate constraints for the ongoing experiments and how the next generation experiments plan to overcome these challenges with moving near detectors.
