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Title: Type-II seesaws at colliders, lepton asymmetry and singlet scalar dark matter

Abstract

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 ({Lambda}) giving rise to neutrino masses is independent of the scale of leptogenesis ({Lambda}'). 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{sub 2} symmetry, which could be lifted at the Planck scale, thereby allowing Planck scale suppressed decay of singlet scalar dark matter particles of mass Almost-Equal-To 3 MeV to e{sup +}e{sup -} 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)

Authors:
;  [1];  [2]
  1. Cosmology and Astroparticle Physics Group, University of Lancaster, Lancaster LA1 4YB (United Kingdom)
  2. Theory Division, Physical Research Laboratory, Navarangpura, Ahmedabad, 380 009 (India)
Publication Date:
OSTI Identifier:
22137862
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2008; Journal Issue: 04; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASYMMETRY; CERN LHC; ELECTRONS; GEV RANGE; NEUTRINOS; NONLUMINOUS MATTER; PARTICLE PRODUCTION; POSITRONS; SCALARS; STANDARD MODEL; SYMMETRY BREAKING; TEV RANGE

Citation Formats

McDonald, John, Sahu, Narendra, and Sarkar, Utpal. Type-II seesaws at colliders, lepton asymmetry and singlet scalar dark matter. United States: N. p., 2008. Web. doi:10.1088/1475-7516/2008/04/037.
McDonald, John, Sahu, Narendra, & Sarkar, Utpal. Type-II seesaws at colliders, lepton asymmetry and singlet scalar dark matter. United States. https://doi.org/10.1088/1475-7516/2008/04/037
McDonald, John, Sahu, Narendra, and Sarkar, Utpal. Tue . "Type-II seesaws at colliders, lepton asymmetry and singlet scalar dark matter". United States. https://doi.org/10.1088/1475-7516/2008/04/037.
@article{osti_22137862,
title = {Type-II seesaws at colliders, lepton asymmetry and singlet scalar dark matter},
author = {McDonald, John and Sahu, Narendra and Sarkar, Utpal},
abstractNote = {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 ({Lambda}) giving rise to neutrino masses is independent of the scale of leptogenesis ({Lambda}'). 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{sub 2} symmetry, which could be lifted at the Planck scale, thereby allowing Planck scale suppressed decay of singlet scalar dark matter particles of mass Almost-Equal-To 3 MeV to e{sup +}e{sup -} 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)},
doi = {10.1088/1475-7516/2008/04/037},
url = {https://www.osti.gov/biblio/22137862}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 04,
volume = 2008,
place = {United States},
year = {2008},
month = {4}
}