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The measurements of coherent elastic neutrino-nucleus scattering (CE$\nu$NS)experiments have opened up the possibility to constrain neutrino physics beyondthe standard model of elementary particle physics. Furthermore, by consideringneutrino-electron scattering in the keV-energy region, it is possible to setadditional limits on new physics processes. Here, we present constraints thatare derived from CONUS germanium data on beyond the standard model (BSM)processes like tensor and vector non-standard interactions (NSIs) in theneutrino-quark sector, as well as light vector and scalar mediators. Thanks tothe realized low background levels in the CONUS experiment at ionizationenergies below 1 keV, we are able to set the world's best limits on tensor NSIsfrom CE$\nu$NS and constrain the scale of corresponding new physics to lieabove 360 GeV. For vector NSIs, the derived limits strongly depend on theassumed ionization quenching factor within the detector material, since smallquenching factors largely suppress potential signals for both, the expectedstandard model CE$\nu$NS process and the vector NSIs. Furthermore, competitivelimits on scalar and vector mediators are obtained from the CE$\nu$NS channelat reactor-site which allow to probe coupling constants as low as$5\cdot10^{-5}$ of low mediator masses, assuming the currently favoredquenching factor regime. The consideration of neutrino-electron scatteringsallows to set even stronger constraints for mediator masses below $\sim1$ MeVand $\sim 10$ MeV for scalar and vector mediators, respectively.

Novel constraints on neutrino physics beyond the standard model from the CONUS experiment