Millicharged Particles in Liquid Argon Neutrino Experiments

Understand

We investigate the potential of Liquid Argon (LAr) neutrino detectors to search for millicharged particles, a well-motivated extension of the standard model.

• Detectors located downstream of an intense proton beam that is striking a target may be exposed to a large flux of millicharged particles.
• Millicharged particles interact primarily through low momentum exchange producing electron recoil events near detector threshold.
• Recently, sub-MeV detection capabilities were demonstrated by the Fermilab ArgoNeuT detector, a small LAr detector which was exposed to the NuMI neutrino beam.