2006/10/31 by Jing Shu, Tim M. P. Tait, Carlos E. M. Wagner
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1103/physrevd.75.063510
published as Phys.Rev.D75:063510,2007 · 25 pages, 6 figures, submitted to PRD
arxiv created 2007/02/19 · openalex publication_date 2007/03/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We explore the possibility that the observed baryon asymmetry of the Universe is the result of an earlier phase transition in which an extended gauge sector breaks down into the SU(3)C\ifmmode×\else\texttimes\fiSU(2)L\ifmmode×\else\texttimes\fiU(1)Y of the standard model. Our proto-typical example is the topflavor model, in which there is a separate SU(2)1 for the third generation from the SU(2)2 felt by the first two generations. We show that the breakdown of SU(2)1\ifmmode×\else\texttimes\fiSU(2)2\ensuremath→SU(2)L results in lepton number being asymmetrically distributed throughout the three families, and provided the SM electroweak phase transition is not strongly first order, results in a nonzero baryon number, which for parameter choices that can be explored at the LHC may explain the observed baryon asymmetry.