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Title: Cloistered baryogenesis

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.
Authors:
 [1] ; ; ;  [2]
  1. IFPA, Dep. AGO, Universite de Liege, Bat B5, Sart Tilman, Liege 1, B-4000 (Belgium)
  2. INFN, Laboratori Nazionali di Frascati, Via Enrico Fermi 40, Frascati, I-00044 (Italy)
Publication Date:
OSTI Identifier:
22369774
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 02; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANTIMATTER; ASYMMETRY; BARYON NUMBER; BARYONS; CERN LHC; COLOR MODEL; LEPTONS; MASS; PARTICLE DECAY; PLASMA; TEV RANGE; TWO-BODY PROBLEM