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Improved Limits on Millicharged Particles Using the ArgoNeuT Experiment at Fermilab

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arxiv 1911.07996 v3 pith:Y6LIQW7Q submitted 2019-11-18 hep-ex hep-phphysics.ins-det

ArgoNeuT Collaboration: R. Acciarri , C. Adams , J. Asaadi , B. Baller , T. Bolton , C. Bromberg , F. Cavanna , D. Edmunds
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R. S. Fitzpatrick B. Fleming R. Harnik C. James I. Lepetic B. R. Littlejohn Z. Liu X. Luo O. Palamara G. Scanavini M. Soderberg J. Spitz A. M. Szelc W. Wu T. Yang
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classification hep-exhep-phphysics.ins-det
keywords millichargedparticlessearchargoneutdetectorbeeneventfermilab
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

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 $1.0$ $\times$ $10^{20}$ protons on target, one candidate event has been observed, compatible with the expected background. This search is sensitive to millicharged particles with charges between $10^{-3}e$ and $10^{-1}e$ and with masses in the range from $0.1$ GeV to $3$ GeV. This measurement provides leading constraints on millicharged particles in this large unexplored parameter space region.

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Forward citations

Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Freeze-in Production of Non-Abelian Millicharged Vector Dark Matter

    hep-ph 2025-12 conditional novelty 6.0 of 10

    A hidden SU(2) gauge sector broken to a massless dark photon can produce vector dark matter via freeze-in with portal couplings near 10^-7.

  2. Constraints on millicharged particles from nuclear gamma-decays

    hep-ph 2025-07 conditional novelty 6.0 of 10

    Nuclear gamma cascades in reactors produce millicharged particle pairs, giving the strongest constraints on millicharge for masses between 0.7 and 2 MeV.

  3. Search for millicharged particles in proton-proton collisions at $\sqrt{s} = 13.6$ TeV

    hep-ex 2025-06 accept novelty 6.0 of 10

    No millicharged particles were found in 124.7 fb^-1 of 13.6 TeV data; milliQan sets the strongest limits to date for masses >= 0.45 GeV and charges <= 0.24 e.

  4. DarkNESS: A skipper-CCD NanoSatellite for Dark Matter Searches

    astro-ph.IM 2025-05 conditional novelty 6.0 of 10

    A mission design paper describing how a skipper-CCD CubeSat in low Earth orbit could search for strongly interacting sub-GeV dark matter and decaying dark matter X-rays.

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