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Search for Reactor-Produced Millicharged Particles with Skipper-CCDs at the CONNIE and Atucha-II Experiments.

Alexis A Aguilar-Arevalo1, Juan Carlos D'Olivo1, Youssef Sarkis1

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We set new world-leading limits on millicharged particles, exotic particles potentially produced in nuclear reactors. Our research utilized advanced sensors to enhance sensitivity for these elusive particles.

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Area of Science:

  • Particle Physics
  • Nuclear Reactor Physics
  • Astrophysics

Background:

  • Millicharged particles are hypothetical particles proposed by extensions to the Standard Model.
  • These particles can be produced by high-energy photons in nuclear reactors.
  • Their electromagnetic interactions with electrons offer a potential detection pathway.

Purpose of the Study:

  • To search for millicharged particles using data from nuclear reactor experiments.
  • To establish new world-leading limits on the charge of millicharged particles.
  • To leverage the eV-range sensitivity of Skipper-CCD sensors for enhanced detection.

Main Methods:

  • Analysis of data from the CONNIE and Atucha-II reactor neutrino experiments.
  • Utilizing Skipper-Charge-Coupled Device (CCD) sensors for high-sensitivity detection in the eV range.
  • Combining data from multiple experiments to improve statistical significance.

Main Results:

  • Established world-leading exclusion limits on the charge of millicharged particles.
  • Covered a broad mass range spanning six orders of magnitude.
  • Demonstrated the effectiveness of reactor-based experiments and Skipper-CCD technology for millicharged particle searches.

Conclusions:

  • The search for millicharged particles using reactor experiments and Skipper-CCD sensors is a promising avenue.
  • The presented limits significantly constrain the parameter space for millicharged particles.
  • Future searches can further refine these limits and explore different detection strategies.