Direct Detection limits on milli-charged particles from the DAMIC-100 Experiment at SNOLAB

The DAMIC (Dark Matter in CCDs) experiment utilizes high resistivity, scientific grade CCDs to search for ionization interactions produced by Dark Matter. However with a demonstrated combination of low electronic noise of 1.6 e⁻, an ionization response threshold of 35 eV_ee and high spatial resolution of particle interactions, the experiment is also suited for searches of exotic physics. One such candidate, milli-charged particles (mCPs), are fractionally charged particles that interact purely electromagnetically and are motivated by certain extensions to the Standard Model. By combining a search for spatial coincidences with constraints from leakage current, we present here the results of a ~7 kg-day search for mCPs with the current iteration of the experiment, DAMIC-100 at SNOLAB, and place stringent direct detection limits on the mCP flux from fractional charge e/6 to e/10000.