Baryogenesis and Dark Matter from B Mesons

  • Aug. 26, 2019, 2:00 pm
  • Curia II
  • Miguel Escudero Abenza, King's College London

In this talk, based on arXiv:1810.00880, I will present a new mechanism of Baryogenesis and dark matter production in which both the dark matter relic abundance and the baryon asymmetry arise from neutral B meson oscillations and subsequent decays.

In the early Universe, decays of a long lived particle produce B mesons and anti-mesons out of thermal equilibrium. These mesons/anti-mesons then undergo CP violating oscillations before quickly decaying into visible and dark sector particles. Dark matter will be charged under Baryon number so that the visible sector baryon asymmetry is produced without violating the total baryon number of the Universe. The produced baryon asymmetry will be directly related to the leptonic charge asymmetry in neutral B decays. Dark matter is stabilized by an unbroken discrete symmetry, and proton decay is simply evaded by kinematics.

This mechanism leads to distinctive experimental signatures: a large branching fraction of B meson decaying into a baryon and missing energy (> 10-4) and a positive semileptonic asymmetry in neutral B meson decays (> 10-5). These unique collider signatures are testable at current collider experiments, like the LHC and Belle-II, allowing for a distinct probe of this mechanism.