Denton, Peter B.Gehrlein, JuliaPestes, Rebekah2021-08-032021-08-032021-02-040031-900751801http://hdl.handle.net/10919/104559Neutrino 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 CP-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 CP-violating NSI preferring a new complex phase that is close to maximal: phi(e mu) or phi(e tau) approximate to 3 pi/2 with vertical bar epsilon(e mu vertical bar) or vertical bar epsilon(e tau)vertical bar similar to 0.2. We then compare the results from long-baseline data to constraints from IceCube and COHERENT.application/pdfenCreative Commons Attribution 4.0 InternationalArticle - Refereedhttps://doi.org/10.1103/PhysRevLett.126.0518011265336057421079-7114