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Search for reactor-produced millicharged particles with Skipper-CCDs at the CONNIE and Atucha-II experiments

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arxiv 2405.16316 v2 pith:LJJ2GY3R submitted 2024-05-25 hep-ex physics.ins-det

Alexis A. Aguilar-Arevalo , Nicolas Avalos , Pablo Bellino , Xavier Bertou , Carla Bonifazi , Ana Botti , Mariano Cababié , Gustavo Cancelo
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Brenda A. Cervantes-Vergara Claudio Chavez Fernando Chierchie David Delgado Eliana Depaoli Juan Carlos D'Olivo João dos Anjos Juan Estrada Guillermo Fernandez Moroni Aldo R. Fernandes Neto Richard Ford Ben Kilminster Kevin Kuk Andrew Lathrop Patrick Lemos Herman P. Lima Jr. Martin Makler Agustina Magnoni Katherine Maslova Franciole Marinho Jorge Molina Irina Nasteva Ana Carolina Oliveira Santiago Perez Laura Paulucci Dario Rodrigues Youssef Sarkis Ivan Sidelnik Miguel Sofo Haro Diego Stalder Javier Tiffenberg Pedro Ventura
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classification hep-exphysics.ins-det
keywords experimentsmillichargedparticlesrangeatucha-iiconnieanalysisapproach
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Millicharged particles, proposed by various extensions of the standard model, can be created in pairs by high-energy photons within nuclear reactors and can interact electromagnetically with electrons in matter. Recently, the existence of a plasmon peak in the interaction cross-section with silicon in the eV range was highlighted as a promising approach to enhance low-energy sensitivities. The CONNIE and Atucha-II reactor neutrino experiments utilize Skipper-CCD sensors, which enable the detection of interactions in the eV range. We present world-leading limits on the charge of millicharged particles within a mass range spanning six orders of magnitude, derived through a comprehensive analysis and the combination of data from both experiments.

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Cited by 4 Pith papers

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

  1. Novel Constraints on Spin-Dependent Light Dark Matter Scattering

    hep-ph 2026-02 unverdicted novelty 7.0 of 10

    SNO data combined with CANDU reactor production excludes spin-dependent χ-nucleon cross sections above ~10^{-33} cm² for m_χ ≤ 1.5 MeV.

  2. Constraints on Axion-Like Particles with the Silicon Detector at a Nuclear Reactor

    hep-ph 2026-01 conditional novelty 6.0 of 10

    New 90% C.L. limits on the ALP–photon coupling in the 0.1–100 keV range are derived from Connie and Atucha-II reactor data via plasmon excitation in silicon; a 30 kg·yr Oscura-style run could improve on NEON by about tenfold.

  3. 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.

  4. Hunting for Axions in REactor neutrino COherent scattering Detection Experiment

    hep-ph 2025-09 conditional novelty 4.0 of 10

    RECODE, a reactor experiment with two germanium detectors, could probe axion-photon and axion-electron couplings into the cosmological triangle region at masses around 0.3 to 0.9 MeV.

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