English

Baryogenesis and Dark Matter from $B$ Mesons

High Energy Physics - Phenomenology 2019-02-22 v3 Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment

Abstract

We 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 BB meson oscillations and subsequent decays. This set-up is testable at hadron colliders and BB-factories. In the early Universe, decays of a long lived particle produce BB 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 BB decays; an experimental observable. Dark matter is stabilized by an unbroken discrete symmetry, and proton decay is simply evaded by kinematics. We will illustrate this mechanism with a model that is unconstrained by di-nucleon decay, does not require a high reheat temperature, and would have unique experimental signals -- a positive leptonic asymmetry in BB meson decays, a new decay of BB mesons into a baryon and missing energy, and a new decay of bb-flavored baryons into mesons and missing energy. These three observables are testable at current and upcoming collider experiments, allowing for a distinct probe of this mechanism.

Keywords

Cite

@article{arxiv.1810.00880,
  title  = {Baryogenesis and Dark Matter from $B$ Mesons},
  author = {Gilly Elor and Miguel Escudero and Ann E. Nelson},
  journal= {arXiv preprint arXiv:1810.00880},
  year   = {2019}
}

Comments

17 pages, 6 figures. v2: references added, corrected the antinucleon abundance calculation (sec III.C.iii), and included comments on the viability of a measurement of the decay of $b$-flavored baryons into mesons and missing energy at hadron colliders (sec IV.A.iii). v3: matches the published version

R2 v1 2026-06-23T04:24:50.421Z