2013/10/31 by Fabrizio Rompineve
Physics and Astronomy · #Asymmetry #Axion #Baryogenesis #Baryon #Baryon asymmetry #Baryon number #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Dark matter #Lepton #Metastability #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum mechanics #R-parity #Supersymmetry #hep-ph
paper · pdf · doi:10.1007/jhep08(2014)014
published as JHEP 1408 (2014) 014 · 31 pages, 12 figures. Revised version according to JHEP requirements: quantitative analyses added in Sec. 4, extended and revised list of refs, abstract and conclusions clarified
openalex publication_date 2014/08/01 · arxiv created 2014/08/06 · arxiv updated 2014/08/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate the connection between R-parity violation (RPV) in supersymmetric models and Baryogenesis. First we discuss in detail the assumptions of a theorem by Nanopoulos and Weinberg on the CP asymmetry generated from the decay of massive particles. In light of this statement, we analyse some interesting models of Baryogenesis through RPV. We then explore, in the context of RPV SUSY, the possibility to generate the baryon asymmetry through the out-of-equilibrium decay of a metastable Weakly Interacting Massive Particle (WIMP), as proposed in [1]. This setting is also motivated by the observed coincidence between the abundances of dark and baryonic matter. In this framework, we propose two models of out-of-equilibrium decay of a would-be cold relic, and compute the associated CP asymmetry. With a TeV-scale parent, the observed baryon abundance can be reproduced in these models when the stop is in the multi-TeV region. Furthermore, annihilation of the metastable particle into SM states must be characterised by a very weak coupling, g ~ 10−2 and by a heavy mediator m med ~ 10 TeV. These models can also accommodate stop masses far from the TeV scale, at the expense of weakening the explanation of the Ω B − ΩDM coincidence.