Galactic center GeV gamma-ray excess from dark matter with gauged lepton numbers

Abstract

The recently observed excess in gamma-ray signal near the Galactic center suggests that dark matter particles may annihilate into charged fermions that produce gamma-ray to be observed. In this paper, we consider a leptonic dark matter, which annihilates into the standard model leptons, ${\mu }^{+}{\mu }^{-}$ and ${\tau }^{+}{\tau }^{-}$, by the interaction of the gauged lepton number ${\mathrm{U}(1)}_{L_{\mu }-L_{\tau }}$ and fits the observed excess. Interestingly, the necessary annihilation cross section for the observed gamma-ray flux provides a good fit to the value for the relic abundance of dark matter. We identify the preferred parameter space of the model after taking the existing experimental constraints from the precision measurements including the muon $(g-2)$, tau decay, neutrino trident production, dark matter direct detection, LHC, and LEP experiments.

18 pages, 8 figures, references added, matches published version

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Cited by in corpus (21)

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• Minimal Gauged U(1)${}_{L_{\alpha }-L_{\beta }}$ Models Driven into a Corner
• Gauged $U(1{)}_{L_{\mu }-L_{\tau }}$ model in light of muon $g-2$ anomaly, neutrino mass and dark matter phenomenology
• The Dark $L_{\mu }-L_{\tau }$ Rises via Kinetic Mixing
• Secluded singlet fermionic dark matter driven by the Fermi gamma-ray excess
• Model-independent analysis of the DAMPE excess
• Predictions for the neutrino parameters in the minimal model extended by linear combination of U(1)${}_{L_e-L_{\mu }}$, U(1)${}_{L_{\mu }-L_{\tau }}$ and U(1)${}_{B-L}$ gauge symmetries
• The Semi-Hooperon: Gamma-ray and anti-proton excesses in the Galactic Center
• A Call for New Physics : The Muon Anomalous Magnetic Moment and Lepton Flavor Violation
• Boxes, Boosts, and Energy Duality: Understanding the Galactic-Center Gamma-Ray Excess through Dynamical Dark Matter
• Pseudoscalar Portal Dark Matter and New Signatures of Vector-like Fermions
• Searching for new physics effects in future $W$ mass and ${\sin }^2{\theta }_W(Q^2)$ determinations
• Inelastic nuclear scattering from neutrinos and dark matter
• Interpreting the galactic center gamma-ray excess in the NMSSM
• Superheavy Supersymmetric Dark Matter for the origin of KM3NeT Ultra-High Energy signal
• Study of WIMP annihilations into a pair of on-shell scalar mediators
• Dark Matter Internal Pair Production -- A Novel Direct Detection Mechanism
• Extended Higgs-portal dark matter and the Fermi-LAT Galactic Center Excess
• Dark matter properties implied by gamma ray interstellar emission models
• Investigating two-zero texture in the light of gauged Type-II seesaw