26th Australian Institute of Physics Congress and the Australian and New Zealand Conference on Optics and Photonics

Measuring CP Violation with Atmospheric Neutrinos

Not scheduled

20m

Belinda Hutchinson Building (The University of Sydney )

Invited talk AIP | Nuclear and Particle Physics (NUPP)

Speaker

Prof. Nicole Bell (The University of Melbourne)

Description

We propose a new approach to measuring the CP-violating phase in neutrino mixing using atmospheric neutrinos. This involves an up-down flux ratio for sub-GeV atmospheric neutrinos. For Hyper-Kamiokande –– the first experiment with sufficient atmospheric-neutrino statistics in this energy range –– our approach can surpass the sensitivity of accelerator long-baseline experiments near $\delta = $ 90 and 270 degrees, where CP violation is maximal and current data show a preference. Realizing this potential will require additional, but realistic, work to reduce theoretical uncertainties. Success will provide an important, complementary probe to multi-$1B accelerator-based experiments.