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We investigate non-standard interaction effects in antineutrino-electronscattering experiments with baselines short enough to ignore standardoscillation phenomena. The setup is free of ambiguities from the interferencebetween new physics and oscillation effects and is sensitive to bothsemileptonic new physics at the source and purely leptonic new physics in theweak interaction scattering at the detector. We draw on the TEXONO experimentas the model system, extending its analysis of non-standard interaction effectsat the detector to include the generally allowed non-standard interaction phaseat the detector and both non-universal and flavor changing new physics at thereactor source. We confirm that the current data allows for new physicsconstraints at the detector of the same order as those currently published, butwe find that constraints on the source new physics are at least an order ofmagnitude weaker. The new physics phase effects are at the 5% level, noticeablein the 90% C.L. contour plots but not significantly affecting the conclusions.Based on projected increase in sensitivity with an upgraded TEXONO experiment,we estimate the improvement of sensitivity to both source and detectornon-standard interactions. We find that the bounds on source parameters improveby an order of magnitude, but do not reach parameter space beyond currentlimits. On the other hand, the detector new physics sensitivity would pushcurrent limits by factors 5 to 10 smaller.

Short Baseline Reactor Antineutrino-Electron Scattering Experiments and Non-Standard Neutrino Interactions at Source and Detector