2007/11/30 by John McDonald, J. McDonald, Narendra Sahu +1 · 1 citation
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Dark matter #Leptogenesis #Lepton #Lepton number #Neutrino #Neutrino Physics Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Scalar (mathematics) #Seesaw molecular geometry #astro-ph #hep-ph
paper · pdf · doi:10.1088/1475-7516/2008/04/037
published as JCAP 0804:037,2008 · 8 pages, double column, references are added, minor change in title, section-III is revised, one figure is added, typos are corrected
arxiv created 2008/03/07 · openalex publication_date 2008/04/28 · arxiv updated 2010/05/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
We propose an extension of the standard model with a B – L global symmetry that is broken softly at the TeV scale. The neutrinos acquire masses through a type-II seesaw while the lepton ( L ) asymmetry arises in the singlet sector but without B – L -number violation. The model has the virtue that the scale of L -number violation (Λ) giving rise to neutrino masses is independent of the scale of leptogenesis (Λ'). As a result the model can explain neutrino masses, singlet scalar dark matter and leptogenesis at the TeV scale . The stability of the dark matter is ensured by a surviving Z 2 symmetry, which could be lifted at the Planck scale, thereby allowing Planck scale suppressed decay of singlet scalar dark matter particles of mass ≈3 MeV to e + e − pairs in the Galactic halo. The model also predicts a few hundred GeV doubly charged scalar and a long-lived charged fermion, whose decay can be studied at the Large Hadron Collider (LHC) and International Linear Collider (ILC).