TY - JOUR
T1 - Right-handed neutrino dark matter in left-right symmetric models
AU - Bhupal Dev, P. S.
AU - Mohapatra, Rabindra N.
AU - Zhang, Yongchao
N1 - Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2017/7/27
Y1 - 2017/7/27
N2 - We show that in a class of non-supersymmetric left-right extensions of the Standard Model (SM), the lightest right-handed neutrino (RHN) is naturally stable and can therefore play the role of thermal Dark Matter (DM) in the Universe for a wide mass range from TeV to PeV. Our model is based on the gauge group SU(3)c × SU(2)L × SU(2)R × U(1)YL× U(1)YR in which a heavy copy of the SM fermions are introduced and the stability of the RHN DM is guaranteed by an automatic Z2 symmetry present in the leptonic sector. The active neutrino masses in the model arise from the type-II seesaw mechanism. We find a lower bound on the RHN DM mass of order TeV from relic density constraints, as well as an unitarity upper bound in the multi-TeV to PeV scale, depending on the entropy dilution factor. The RHN DM could be made long-lived by soft-breaking of the Z2 symmetry and provides a concrete example of decaying DM interpretation of the PeV neutrinos observed at IceCube.
AB - We show that in a class of non-supersymmetric left-right extensions of the Standard Model (SM), the lightest right-handed neutrino (RHN) is naturally stable and can therefore play the role of thermal Dark Matter (DM) in the Universe for a wide mass range from TeV to PeV. Our model is based on the gauge group SU(3)c × SU(2)L × SU(2)R × U(1)YL× U(1)YR in which a heavy copy of the SM fermions are introduced and the stability of the RHN DM is guaranteed by an automatic Z2 symmetry present in the leptonic sector. The active neutrino masses in the model arise from the type-II seesaw mechanism. We find a lower bound on the RHN DM mass of order TeV from relic density constraints, as well as an unitarity upper bound in the multi-TeV to PeV scale, depending on the entropy dilution factor. The RHN DM could be made long-lived by soft-breaking of the Z2 symmetry and provides a concrete example of decaying DM interpretation of the PeV neutrinos observed at IceCube.
UR - https://www.scopus.com/pages/publications/85028346538
U2 - 10.1088/1742-6596/873/1/012029
DO - 10.1088/1742-6596/873/1/012029
M3 - Conference article
AN - SCOPUS:85028346538
SN - 1742-6588
VL - 873
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012029
T2 - 5th Symposium on Prospects in the Physics of Discrete Symmetries, DISCRETE 2014
Y2 - 28 November 2016 through 3 December 2016
ER -