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Search by the SENSEI Experiment for Millicharged Particles Produced in the NuMI Beam

  • (SENSEI Collaboration)
  • Tel Aviv University
  • University of California at Berkeley
  • Lawrence Berkeley National Laboratory
  • Fermi National Accelerator Laboratory
  • Universidad de Buenos Aires
  • University of Massachusetts
  • Stony Brook University
  • The University of Chicago
  • SNOLAB
  • Instituto de Física de Buenos Aires (IFIBA)
  • Université Grenoble Alpes
  • Consejo Nacional de Investigaciones Científicas y Técnicas
  • University of Oregon
  • University of Minnesota Twin Cities
  • California Institute of Technology

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Millicharged particles appear in several extensions of the standard model, but have not yet been detected. These hypothetical particles could be produced by an intense proton beam striking a fixed target. We use data collected in 2020 by the SENSEI experiment in the MINOS cavern at the Fermi National Accelerator Laboratory to search for ultrarelativistic millicharged particles produced in collisions of protons in the NuMI beam with a fixed graphite target. The absence of any ionization events with 3 to 6 electrons in the SENSEI data allow us to place world-leading constraints on millicharged particles for masses between 30 to 380 MeV. This work also demonstrates the potential of utilizing low-threshold detectors to investigate new particles in beam-dump experiments, and motivates a future experiment designed specifically for this purpose.

Original languageEnglish
Article number071801
JournalPhysical Review Letters
Volume133
Issue number7
DOIs
StatePublished - Aug 16 2024

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