Leptobaryons as Majorana dark matter

2015/06/30 by Sebastian Ohmer, Hiren H. Patel · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Dark matter #Fermion #Higgs boson #MAJORANA #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1103/physrevd.92.055020

published as Phys. Rev. D 92, 055020 (2015) · 15 pages, 10 figures; v3: corrected typos, to appear in PRD

arxiv created 2015/09/04 · openalex publication_date 2015/09/16 · arxiv updated 2015/09/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

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 \ensuremathχ stabilized by an inherent Z₂ symmetry. The absence of evidence for Z prime dijet resonances at the LHC suggests that the scale of symmetry breaking is \mathrm\ensuremathΛ_B\ensuremath\gtrsim500 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 |\ensuremathθ|\ensuremath\lesssim0.22. For small mixing angles of |\ensuremathθ|\ensuremath\lesssim10^\ensuremath-3, the O(10%) branching fractions of the fermion loop-mediated S_B\ensuremath→\ensuremathγ\ensuremathγ, Z\ensuremathγ, ZZ modes may provide clues about the fermion content of the model at the LHC.

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