Baryogenesis from Oscillations of Charmed or Beautiful Baryons

Abstract

We propose a model for CP violating oscillations of neutral, heavy-flavored baryons into antibaryons at rates which are within a few orders of magnitude of their lifetimes. The flavor structure of the baryon violation suppresses neutron oscillations and baryon number violating nuclear decays to experimentally allowed rates. We also propose a scenario for producing such baryons in the early Universe via the out-of-equilibrium decays of a neutral particle, after hadronization but before nucleosynthesis. We find parameters where CP violating baryon oscillations at a temperature of a few MeV could result in the observed asymmetry between baryons and antibaryons. Furthermore, part of the relevant parameter space for baryogenesis is potentially testable at Belle II via decays of heavy flavor baryons into an exotic neutral fermion. The model introduces four new particles: three light Majorana fermions and a colored scalar. The lightest of these fermions is typically long lived on collider timescales and may be produced in decays of bottom and possibly charmed hadrons.

15 pages, 6 figures

References in corpus (9)

• Big-Bang Nucleosynthesis and Gravitino
• Big Bang Nucleosynthesis Constraints on Hadronically and Electromagnetically Decaying Relic Neutral Particles
• The Gravitino-Overproduction Problem in Inflationary Universe
• Isocurvature bounds on axions revisited
• Search for pair-produced resonances decaying to jet pairs in proton-proton collisions at sqrt(s) = 8 TeV
• Excited State Mass spectra of doubly heavy baryons ${\Omega }_{cc}$, ${\Omega }_{bb}$ and ${\Omega }_{bc}$
• Realistic calculations of nuclear disappearance lifetimes induced by neutron-antineutron oscillations
• Three-generation baryon and lepton number violation at the LHC
• CP Violation in Pseudo-Dirac Fermion Oscillations

Cited by in corpus (22)

• Strong constraints on decay and annihilation of dark matter from heating of gas-rich dwarf galaxies
• Freezing-in hadrophilic dark matter at low reheating temperatures
• Neutron Stars with Baryon Number Violation, Probing Dark Sectors
• Unleashing the full power of LHCb to probe Stealth New Physics
• Neutron Decay to a Non-Abelian Dark Sector
• WIMPs Without Weakness: Generalized Mass Window with Entropy Injection
• Dark sectors in neutron-shining-through-a-wall and nuclear absorption signals
• High Energy Sphalerons for Baryogenesis at Low Temperatures
• Probing $R$-parity violation in $B$-meson decays to a baryon and a light neutralino
• Search for baryon-number-violating ${\Xi }_b^0$ oscillations
• Dark Freeze-out Cogenesis
• New physics decaying into metastable particles: impact on cosmic neutrinos
• Suppression of Higgs Mixing by Quantum Zeno Effect
• Matter-antimatter asymmetry and dark matter stability from baryon number conservation
• Signatures of Bulk Neutrinos in the Early Universe
• Neutron-neutral particle mixing and its observable consequences
• Effective Theory for Baryogenesis with a Majorana Fermion Pair Coupled to Quarks
• New Physics Searches at Kaon and Hyperon Factories
• Neutrino Mass Induced $n$-$\overline{n}$ Oscillation
• Baryogenesis via relativistic bubble walls
• The Strange Physics of Dark Baryons
• $CP$ violation in heavy-flavour hadrons