Beyond standard model; Baryon asymmetry; Baryogenesis
Abstract :
[en] 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.
Disciplines :
Physics
Author, co-author :
Aristizabal Sierra, Diego ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Physique des astroparticules
Fong, Chee Sheng; Istituto Nazionale di Fisica Nucleare > Laboratori Nazionali di Frascati
Nardi, Enrico; Istituto Nazionale di Fisica Nucleare > Laboratori Nazionali di Frascati
Peinado, Eduardo; Istituto Nazionale di Fisica Nucleare > Laboratori Nazionali di Frascati
Language :
English
Title :
Cloistered Baryogenesis
Publication date :
February 2014
Journal title :
Journal of Cosmology and Astroparticle Physics
eISSN :
1475-7516
Publisher :
Institute of Physics Publishing (IOP), Bristol, United Kingdom
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