Improved Limits on Millicharged Particles Using the ArgoNeuT Experiment at Fermilab

(ArgoNeuT Collaboration)

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


A search for millicharged particles, a simple extension of the standard model, has been performed with the ArgoNeuT detector exposed to the Neutrinos at the Main Injector beam at Fermilab. The ArgoNeuT liquid argon time projection chamber detector enables a search for millicharged particles through the detection of visible electron recoils. We search for an event signature with two soft hits (MeV-scale energy depositions) aligned with the upstream target. For an exposure of the detector of 1.0×1020 protons on target, one candidate event has been observed, compatible with the expected background. This search is sensitive to millicharged particles with charges between 10-3e and 10-1e and with masses in the range from 0.1 to 3 GeV. This measurement provides leading constraints on millicharged particles in this large unexplored parameter space region.

Original languageEnglish (US)
Article number131801
JournalPhysical Review Letters
Issue number13
StatePublished - Apr 3 2020

ASJC Scopus subject areas

  • General Physics and Astronomy


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