Indirect detection of light neutralino dark matter in the NMSSM

Abstract

We explore the prospects for indirect detection of neutralino dark matter in supersymmetric models with an extended Higgs sector (NMSSM). We compute, for the first time, one-loop amplitudes for NMSSM neutralino pair annihilation into two photons and two gluons, and point out that extra diagrams (with respect to the MSSM), featuring a potentially light CP-odd Higgs boson exchange, can strongly enhance these radiative modes. Expected signals in neutrino telescopes due to the annihilation of relic neutralinos in the Sun and in the Earth are evaluated, as well as the prospects of detection of a neutralino annihilation signal in space-based gamma-ray, antiproton and positron search experiments, and at low-energy antideuteron searches. We find that in the low mass regime the signals from capture in the Earth are enhanced compared to the MSSM, and that NMSSM neutralinos have a remote possibility of affecting solar dynamics. Also, antimatter experiments are an excellent probe of galactic NMSSM dark matter. We also find enhanced two photon decay modes that make the possibility of the detection of a monochromatic gamma-ray line within the NMSSM more promising than in the MSSM.

26 pages, 12 figures. Updated references and corrected discussion of Upsilon decays

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• Higgs Sector in Extensions of the MSSM
• TeV gamma-rays and the largest masses and annihilation cross sections of neutralino dark matter
• The Role of Antimatter Searches in the Hunt for Supersymmetric Dark Matter
• Challenges in Detecting Gamma-Rays From Dark Matter Annihilations in the Galactic Center
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Cited by in corpus (25)

• A Tentative Gamma-Ray Line from Dark Matter Annihilation at the Fermi Large Area Telescope
• Fermi 130 GeV gamma-ray excess and dark matter annihilation in sub-haloes and in the Galactic centre
• Conservative Constraints on Dark Matter Annihilation into Gamma Rays
• Recoil Detection of the Lightest Neutralino in MSSM Singlet Extensions
• Collider Signatures of Singlet Extended Higgs Sectors
• The New DAMA Dark-Matter Window and Energetic-Neutrino Searches
• Spin Dependence of Dark Matter Scattering
• Towards a Supersymmetric Description of the Fermi Galactic Center Excess
• Hunting the lightest lightest neutralinos
• Search with EGRET for a Gamma Ray Line from the Galactic Center
• LHC discovery potential of the lightest NMSSM Higgs in the h1 -> a1 a1 -> 4 muons channel
• Theoretical upper bound on the mass of the LSP in the MNSSM
• Gamma rays from the Galactic Centre region: a review
• Precision measurements, dark matter direct detection and LHC Higgs searches in a constrained NMSSM
• Increasing the Neutralino Relic Abundance with Slepton Coannihilations: Consequences for Indirect Dark Matter Detection
• Lightest Higgs Boson and Relic Neutralino in the MSSM with CP Violation
• Status of low mass LSP in SUSY
• The Shadow of Dark Matter
• Direct/indirect detection signatures of nonthermally produced dark matter
• Non-thermal X-rays from the Ophiuchus galaxy cluster and dark matter annihilation
• Z_2-Singlino Dark Matter in a Portal-Like Extension of the Minimal Supersymmetric Standard Model
• Proposal for testing lepton universality in Upsilon decays at a B-factory running at ${\rm Y}(3S)$
• Mass-varying Dark Matter from a Phase Transition
• Dark Matter in the CP-violating NMSSM
• Dark matter constraints and the neutralino sector of the scNMSSM