Nonstandard interactions versus planet-scale neutrino oscillations

The low-energy threshold and the large detector size of Precision IceCube Next Generation Upgrade (PINGU) can make the study on neutrino oscillations with a planet-scale baseline possible. In this task, we consider the configuration that neutrinos are produced at CERN and detected in the PINGU detector, as a benchmark. We discuss its sensitivity of measuring the size of nonstandard interactions (NSIs) in matter, which can be described by the parameter ε_αβ (α and β are flavors of neutrinos). We find that the CERN-PINGU configuration improves ${{{}}{{ε}}}_{{μ}{μ}}{≡}{{ε}}_{{μ}{μ}}{-}{{ε}}_{{τ}{τ}}$ and ${{ε}}_{{μ}{τ}}$ significantly compared to the next-generation accelerator neutrino experiments. Most of the degeneracy problems in the precision measurements can be resolved, except the one for ${{{}}{{ε}}}_{{μ}{μ}}{~}{-}0.035$. Moreover, we point out that this configuration can also be used to detect the $CP$ violation brought by NSIs. Finally, we compare the physics potential in this configuration to that for DUNE, T2HK, and P2O, and find that the CERN-PINGU configuration can significantly improve the sensitivity to NSIs.