Millicharged particles in liquid argon neutrino experiments

Roni Harnik, Zhen Liu, Ornella Palamara

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


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. Despite high background rates and its small size, we show that ArgoNeuT is capable of probing unexplored parameter space with its existing dataset. In particular, we show that the excellent spatial resolution in LAr detectors allows rejecting backgrounds by requiring two soft hits that are aligned with the upstream target. We further discuss the prospects of these types of searches in future larger LAr neutrino detectors such as the DUNE near detector.

Original languageEnglish (US)
Article number170
JournalJournal of High Energy Physics
Issue number7
StatePublished - Jul 1 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2019, The Author(s).


  • Beyond Standard Model
  • Neutrino Physics


Dive into the research topics of 'Millicharged particles in liquid argon neutrino experiments'. Together they form a unique fingerprint.

Cite this