Probing Source and Detector NSI parameters at the DUNE Near Detector.

We investigate the capability of the DUNE Near Detector (ND) to constrain Non Standard Interaction parameters (NSI) describing the production of neutrinos ($\varepsilon_{\alpha\beta}^s$) and their detection ($\varepsilon_{\alpha\beta}^d$). We show that the DUNE ND is able to reject a large portion of the parameter space allowed by DUNE Far Detector analyses and to set the most stringent bounds from accelerator neutrino experiments on $|\varepsilon_{\mu e}^{s,d}|$ and $|\varepsilon_{\mu\tau}^{s,d}|$ for wide intervals of the related phases. We also provide simple analytic understanding of our results as well as their dependence on the data taking time, showing that the DUNE ND offers a theoretically clean environment where to study source and detector NSI.