Electric charge conservation (ECC) is typically taken as an axiom in the standard model. Searching for small violations with high-performance experiments could lead us to new physics. In this work, we tested ``invisible" electric charge nonconservation (ECNC) events with 1.16 ton⋅year electron recoil data from the XENON-nT experiment. There was no statistically significant signal, and the ECNC limit was updated to τ(e−→νe+νˉe+νe)>4.34×1027 yr. This work increases the limit by two orders of magnitude and shows that dark matter direct detection experiments have great potential for further ECC testing.
@article{arxiv.2502.03258,
title = {Test of electric charge conservation in dark matter direct detection experiment},
author = {Z. H. Zhang and X. P. Geng and J. W. Hu and Z. H. Zhang},
journal= {arXiv preprint arXiv:2502.03258},
year = {2025}
}