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Hidden-Sector Neutrinos and Freeze-In Leptogenesis

ORAL

Abstract

Sterile neutrinos at the GeV scale can resolve several outstanding problems of the Standard Model (SM), such as neutrino masses and the origin of the baryon asymmetry through freeze-in leptogenesis, but they can be challenging to detect experimentally due to their small couplings to SM particles. However, in extensions of the SM with new forces or scalars, the sterile neutrinos can be produced copiously at particle colliders. We systematically investigate the impact of such interactions on the asymmetry obtained in freeze-in leptogenesis via neutrino oscillations. We find that such interactions tend to bring the sterile neutrino states into equilibrium at early times, leading to a significant reduction in the generated asymmetry. If sterile neutrinos are discovered via hidden-sector intermediate states at current or future experiments, it is likely that the couplings are too large to accommodate the observed baryon asymmetry.

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Authors

  • Rafael Porto

    Harvey Mudd College

  • Ina Flood

    Saleh Research Centre, University of Hawaii at Manoa, California State University, Long Beach, University of California Berkeley, University of Arizona, California State University, Long Beach Department of Physics and Astronomy, University of California Los Angeles Department of Physics and Astronomy, University of California, San Diego, University of California, Davis, Donostia International Physics Center, Yale University, Argonne National Laboratory, SLAC - Natl Accelerator Lab, Heidelberg University, Indiana University-Perdue University Indianapolis, Humboldt State University, Indiana University, Syracuse University, University of California Santa Cruz, STAR Teacher Program, Monta Vista High School, Saint Francis High School, Lawrenceville School, INAF, Ben-Gurion University, STScI, University of California, Los Angeles, Wuhan University, Harvey Mudd College, University of Maryland

  • Ina Flood

    Saleh Research Centre, University of Hawaii at Manoa, California State University, Long Beach, University of California Berkeley, University of Arizona, California State University, Long Beach Department of Physics and Astronomy, University of California Los Angeles Department of Physics and Astronomy, University of California, San Diego, University of California, Davis, Donostia International Physics Center, Yale University, Argonne National Laboratory, SLAC - Natl Accelerator Lab, Heidelberg University, Indiana University-Perdue University Indianapolis, Humboldt State University, Indiana University, Syracuse University, University of California Santa Cruz, STAR Teacher Program, Monta Vista High School, Saint Francis High School, Lawrenceville School, INAF, Ben-Gurion University, STScI, University of California, Los Angeles, Wuhan University, Harvey Mudd College, University of Maryland

  • Brian Shuve

    Harvey Mudd College

  • Ina Flood

    Saleh Research Centre, University of Hawaii at Manoa, California State University, Long Beach, University of California Berkeley, University of Arizona, California State University, Long Beach Department of Physics and Astronomy, University of California Los Angeles Department of Physics and Astronomy, University of California, San Diego, University of California, Davis, Donostia International Physics Center, Yale University, Argonne National Laboratory, SLAC - Natl Accelerator Lab, Heidelberg University, Indiana University-Perdue University Indianapolis, Humboldt State University, Indiana University, Syracuse University, University of California Santa Cruz, STAR Teacher Program, Monta Vista High School, Saint Francis High School, Lawrenceville School, INAF, Ben-Gurion University, STScI, University of California, Los Angeles, Wuhan University, Harvey Mudd College, University of Maryland