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Making the Universe at 20 MeV

Gilly Elor1,* and Robert McGehee2,3,4,†

  • 1Department of Physics, University of Washington, Seattle, Washington 98195, USA
  • 2Leinweber Center for Theoretical Physics, Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
  • 3Berkeley Center for Theoretical Physics, University of California, Berkeley, California 94720, USA
  • 4Theory Group, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

  • *gelor@uw.edu
  • †rmcgehee@umich.edu
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Phys. Rev. D 103, 035005 – Published 5 February, 2021

DOI: https://doi.org/10.1103/PhysRevD.103.035005

Abstract

We present a testable mechanism of low-scale baryogenesis and dark matter production in which neither the baryon nor lepton number are violated. Charged D mesons are produced out of equilibrium at tens of MeV temperatures. The D mesons quickly undergo CP-violating decays to charged pions, which then decay into dark-sector leptons without violating the lepton number. To transfer this lepton asymmetry to the baryon asymmetry, the dark leptons scatter on additional dark-sector states charged under the lepton and baryon number. Amusingly, this transfer proceeds without electroweak sphalerons, which are no longer active at such low scales. We present two example models which can achieve this transfer while remaining consistent with current limits. The required amount of CP violation in charged D meson decays, while currently allowed, will be probed by colliders. Additionally, the relevant decays of charged pions to dark-sector leptons have been constrained by the PIENU and Paul Scherrer Institute experiments and will be further explored in upcoming experiments.

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Phys. Rev. D 103, 035005– Published 5 February, 2021
  • Received 26 November 2020
  • Accepted 13 January 2021
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