Cloistered Baryogenesis

Abstract

The cosmological matter-antimatter asymmetry can arise from the baryon number conserving CP asymmetry in two body decays of heavy particles, when the two final states carry equal and opposite baryon number, and one couples directly or indirectly to electroweak sphalerons so that its baryon asymmetry gets partly reprocessed into a lepton asymmetry, while the other remains chemically decoupled from the thermal bath with its baryon content frozen. After sphaleron switchoff the decay of the decoupled particles inject in the thermal plasma an unbalanced baryon asymmetry, giving rise to baryogenesis. We highlight the features of this mechanism in a type-I seesaw model extended by adding a new colored scalar coupled to the heavy Majorana neutrinos. If the colored scalar has an O(TeV) mass, it would leave at the LHC a characteristic signature throughout all layers of the detectors.

18 pages, 2 figures; V2 references added, accepted for publication in JCAP

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Cited by in corpus (21)

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• Approximate N${}^3$LO Parton Distribution Functions with Theoretical Uncertainties: MSHT20aN${}^3$LO PDFs
• Probing Baryogenesis with Displaced Vertices at the LHC
• Probing Leptogenesis
• Neutrinoless Double Beta Decay and the Baryon Asymmetry of the Universe
• QED Parton Distribution Functions in the MSHT20 Fit
• Disentangling new physics in $K\to \pi \bar{\nu }\nu$ and $B\to K(K^{\ast })\bar{\nu }\nu$ observables
• Leptogenesis with a dynamical seesaw scale
• Baryon Number Violation via Majorana Neutrinos in the Early Universe, at the LHC, and Deep Underground
• A cosmological pathway to testable leptogenesis
• Natural Seesaw and Leptogenesis from Hybrid of High-Scale Type I and TeV-Scale Inverse
• Leptoflavorgenesis: baryon asymmetry of the Universe from lepton flavor violation
• Testing Dirac leptogenesis with the cosmic microwave background and proton decay
• Minimal Asymmetric Dark Matter
• Hybrid seesaw leptogenesis and TeV singlets
• Mirror Dirac leptogenesis
• Scalar Dark Matter, GUT baryogenesis and Radiative neutrino mass
• Baryogenesis in the Standard Model and its Supersymmetric Extension
• The Dark Side of ${\theta }_{13}$, ${\delta }_{CP}$, Leptogenesis and Inflation in Type-I Seesaw
• Dark Acoustic Oscillations as an Early-Universe Explanation of the DESI Anomaly
• Dirac leptogenesis via scatterings