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In this article, we study the potential of direct detection experiments toexplore the parameter space of general non-standard neutrino interactions (NSI)via solar neutrino scattering. Due to their sensitivity to neutrino-electronand neutrino-nucleus scattering, direct detection provides a complementary viewof the NSI landscape to that of spallation sources and neutrino oscillationexperiments. In particular, the large admixture of tau neutrinos in the solarflux makes direct detection experiments well-suited to probe the full flavourspace of NSI. To study this, we develop a re-parametrisation of the NSIframework that explicitly includes a variable electron contribution and allowsfor a clear visualisation of the complementarity of the different experimentalsources. Using this new parametrisation, we explore how previous bounds fromspallation source and neutrino oscillation experiments are impacted. For thefirst time, we compute limits on NSI from the first results of the XENONnT andLUX-ZEPLIN experiments, and we obtain projections for future xenon-basedexperiments. These computations have been performed with our newly developedsoftware package, SNuDD. Our results demonstrate the importance of using a moregeneral NSI parametrisation and indicate that next generation direct detectionexperiments will become powerful probes of neutrino NSI.

A Direct Detection View of the Neutrino NSI Landscape