Leptobaryons as Majorana Dark Matter

Abstract

We explore the dark matter and collider phenomenology of the minimal gauged $U(1{)}_B$ model, consisting of a leptophobic $Z_B$ gauge boson, and an accompanying Higgs $S_B$. By requirement of anomaly cancellation, the fermion sector naturally contains a dark matter candidate---a Majorana isosinglet $\chi$ stabilized by an inherent $Z_2$ symmetry. The absence of evidence for $Z$ prime dijet resonances at the LHC suggests that the scale of symmetry breaking ${\Lambda }_B\gtrsim 500$ GeV. Saturation of dark matter abundance together with limits on the direct detection cross section (dominated by Higgs exchange) constrains the Higgs mixing angle to $|\theta |\lesssim 0.22$. For small mixing angles of $|\theta |\lesssim 10^{-3}$, the $\mathcal{O}(10\%)$ branching fractions of the fermion loop-mediated $S_B\to \gamma \gamma$, $Z\gamma$, $ZZ$ modes may provide clues about the fermion content of the model at the LHC.

15 pages, 10 figures; v3: corrected typos, to appear in PRD

References in corpus (12)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Parton distributions for the LHC
• Search for resonances and quantum black holes using dijet mass spectra in proton-proton collisions at sqrt(s) = 8 TeV
• Search for Scalar Diphoton Resonances in the Mass Range $65-600$ GeV with the ATLAS Detector in $pp$ Collision Data at $\sqrt{s}$ = 8 $TeV$
• Gluon contribution to the dark matter direct detection
• Theory for Baryon Number and Dark Matter at the LHC
• Cosmic Strings in Hidden Sectors: 1. Radiation of Standard Model Particles
• Cosmic Strings in Hidden Sectors: 2. Cosmological and Astrophysical Signatures
• Electroweak phase transition in a model with gauged lepton number
• Low Scale Unification of Gauge Interactions

Cited by in corpus (17)

• Neutrinophilic Non-Standard Interactions
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• Collider Searches for Dark Matter through the Higgs Lens
• On Anomaly-Free Dark Matter Models
• Leptophobic Dark Matter and the Baryon Number Violation Scale
• Gamma Lines from Majorana Dark Matter
• Dijet and electroweak limits on a $Z^{\prime }$ boson coupled to quarks
• Sharing but not Caring: Dark Matter and the Baryon Asymmetry of the Universe
• Dark Matter from Anomaly Cancellation at the LHC
• Whac-a-constraint with anomaly-free dark matter models
• The Higgs and Leptophobic Force at the LHC
• Gravitational Wave Signatures of Gauged Baryon and Lepton Number
• Baryonic Higgs and Dark Matter
• UV completion of an axial, leptophobic, $Z^{\prime }$
• Probing the Neutrino Seesaw Scale with Gravitational Waves
• Simplified Dark Matter Models