We explore the complementarity between LHC searches and neutrino experiments in probing neutrino non- standard interactions. Our study [1] spans the theoretical frameworks of effective field theory, simplified model and an illustrative UV completion, highlighting the synergies and distinctive features in all cases. We show that besides constraining the allowed NSI parameter space, the LHC data can break important degeneracies present in oscillation experiments such as DUNE, while the latter play an important role in probing light and weakly coupled physics undetectable at the LHC. Neutrino Non-Standard Interactions: Complementarities Between LHC and Oscillation Experiments Sudip Jana Max-Planck-Institut für Kernphysik, Heidelberg, Germany 1. K.S. Babu, Dorival Gonçalves, Sudip Jana and Pedro A. N. Machado, arXiv: 2003.03383 [hep-ph]AbstractNeutrino NSI from EFTs to Simplified ModelsComplementarity between LHC and neutrino experimentsTowards a UV complete scenarioConclusionsBibliography We have explored the complementarity between neutrino experiments and LHC searches in probing neutrino NSI. It covers the full span of theory frameworks: effective field theories, simplified models, and an illustrative UV completion. The LHC sensitivities to NSIs display relevant synergies to oscillation results. Namely, (i) the breakdown of degeneracies among NSI and oscillation parameters, (ii) sensitivity to new phenomenological signatures at the LHC. As a by-product of our analysis, we have shown that the use of EFT at the LHC in estimating sensitivity to NSIs is not generally theoretically consistent. Any UV complete model of neutrino NSI is expected to provide a more extensive phenomenology, especially since neutrinos are in the same SU(2)L doublet as charged leptons. In this UV completion the B − L number is gauged, but only for the third family. Heavy mediators are strongly constrained by LHC data. Low mediators constrained by low-energy experiments. Low energy constraints, dedicated LHC searches, and missing energy signatures provide strong constraints for different masses of the mediator. For masses below about 10 GeV, low energy observables tend to dominate. In the intermediate regime 10 − 100 GeV, dedicated searches for visible signatures at the LHC become more relevant. Finally, from 0.1 − 1 TeV LHC mono-jet searches, low energy observables and electroweak precision observables (up to the T parameter model dependence) play the leading role. This makes manifest the complementarities among collider data, oscillation measurements, and other low energy observables. Differently from the LHC, the effects of NSIs in neutrino oscillations strongly depend on the flavor structure of the NSI and the oscillation channel being studied. The effects of different NSIs and/or variations of the standard oscillation parameters can, in some cases, compensate each other and lead to well known degeneracies. Disentangling those is a difficult task at neutrino facilities. In contrast, the mono-jet signal at the LHC, does not distinguish between different choices of flavors i.e., they all lead to the same observables. Besides constraining the currently allowed NSI parameter space, this feature can be further exploited to break relevant degeneracies. The LHC sensitivity displays a strong dependence on the mediator mass, but it is free of parameter degeneracies. Neutrino oscillation measurements, on the other hand, exhibit the opposite behavior: significant degeneracies and no mediator mass dependence. The matter potential induced when neutrinos travel through a medium is not affected by a diagonal, universal contribution (as this just induces an overall phase shift on the neutrino state). On the other hand, LHC data is sensitive to each and all NSI parameters independently. Neutrino oscillations are not sensitive to axial interactions, while LHC data is sensitive to both vector and axial new physics contributions. All these features s