Opportunities to Search for New Physics Using Low-Energy Electron Accelerators*

I present an overview of the new physics searches made possible by low-energy accelerators with intense electron beams. We

consider facilities, such as the ARIEL electron linac, for which electron scattering from a proton or deuteron target is below pion

production threshold --- this is key to searches for certain rare processes. For example, the detection of a process such as

e^- p → e⁺ antiproton or e^- p → νbar antineutron would reveal the violation of baryon (and lepton) number by two units, and

thus to physics beyond the Standard Model, with the rare process being signalled by the prompt annihilation of the antinucleon

with matter to yield a multi-pion final state. I will discuss the discovery prospects of such searches, as well as those that would

search for keV/MeV-scale dark-sector particles, and offer a perspective on the  broader context in which they appear, noting

their complementarity to searches at much higher-energy facilities.