-Violating Neutrino Nonstandard Interactions in Long-Baseline-Accelerator Data
Peter B. Denton (High Energy Theory Group, Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA); Julia Gehrlein (High Energy Theory Group, Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA); Rebekah Pestes (Center for Neutrino Physics, Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA, High Energy Theory Group, Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA)
Neutrino oscillations in matter provide a unique probe of new physics. Leveraging the advent of neutrino appearance data from NOvA and T2K in recent years, we investigate the presence of -violating neutrino nonstandard interactions in the oscillation data. We first show how to very simply approximate the expected NSI parameters to resolve differences between two long-baseline appearance experiments analytically. Then, by combining recent NOvA and T2K data, we find a tantalizing hint of -violating NSI preferring a new complex phase that is close to maximal: or with or . We then compare the results from long-baseline data to constraints from IceCube and COHERENT.
