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Two-component dark matter and a massless neutrino in a new B-L model
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abstract
We propose a new extension of the Standard Model by a $U(1)_{B-L}$ gauge symmetry in which the anomalies are canceled by two right-handed neutrinos plus four chiral fermions with fractional B-L charges. Two scalar fields that break the B-L symmetry and give masses to the new fermions are also required. After symmetry breaking, two neutrinos acquire Majorana masses via the seesaw mechanism leaving a massless neutrino in the spectrum. Additionally, the other new fermions arrange themselves into two Dirac particles, both of which are automatically stable and contribute to the observed dark matter density. This model thus realizes in a natural way, without ad hoc discrete symmetries, a two-component dark matter scenario. We analyze in some detail the dark matter phenomenology of this model. The dependence of the relic densities with the parameters of the model is illustrated and the regions consistent with the observed dark matter abundance are identified. Finally, we impose the current limits from LHC and direct detection experiments, and show that the high mass region of this model remains unconstrained.
Forward citations
Cited by 6 Pith papers
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Prospecting bipartite Dark Matter through Gravitational Waves
A two-component dark matter model with an inert triplet scalar and a singlet fermion can explain the relic abundance while producing a strong electroweak phase transition and gravitational wave signals detectable by L...
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Type III Seesaw for Neutrino Masses in $U(1)_{B-L}$ Model with Multi-component Dark Matter
A new U(1)_{B-L} extension with type III seesaw neutrino mass and two-component fermion dark matter is proposed and constrained by relic density, direct detection, and LHC searches.
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Mono-X Signal Characterization from Two-component Dark Matter Using a Convolutional Neural Network
A 1D multi-channel CNN trained on normalized histograms of simulated mono-jet and mono-Z events can partially classify one- versus two-component dark matter and regress masses, but only in a background-free, model-spe...
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Neutrino mass generation via the inverse seesaw mechanism in a $U(1)_{B-L}$ gauge extension
A catalog of anomaly-free B-L charges for inverse seesaw neutrino masses, including rational-charge options, with several table entries that fail the anomaly equations as printed.
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Exploring two component doublet dark matter
A two-component model with an inert scalar doublet and a pseudo-Dirac fermion doublet can match Planck relic density and direct and indirect limits in sub-TeV mass regions, and a type-II seesaw triplet can also genera...
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LHC and HL-LHC Bounds on Visible and Invisible Decays in the $B-L$ Model
Using public ATLAS dilepton data, the B-L Z' is excluded below 4-6 TeV for g_BL=0.1-0.5, with limits relaxing when invisible decays are allowed and extending to about 7.5 TeV at HL-LHC.
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