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Title: Enhanced lines and box-shaped features in the gamma-ray spectrum from annihilating dark matter in the NMSSM

We study spectral features in the gamma-ray emission from dark matter (DM) annihilation in the Next-to-Minimal Supersymmetric Standard Model (NMSSM), with either neutralino or right-handed (RH) sneutrino DM . We perform a series of scans over the NMSSM parameter space, compute the DM annihilation cross section into two photons and the contribution of box-shaped features, and compare them with the limits derived from the Fermi-LAT search for gamma-ray lines using the latest Pass 8 data. We implement the LHC bounds on the Higgs sector and on the masses of supersymmetric particles as well as the constraints on low-energy observables. We also consider the recent upper limits from the Fermi-LAT satellite on the continuum gamma-ray emission from dwarf spheroidal galaxies (dSphs). We show that in the case of the RH sneutrino the constraint on gamma-ray spectral features can be more stringent than the dSph bounds. This is due to the Breit-Wigner enhancement near the ubiquitous resonances with a CP even Higgs and the contribution of scalar and pseudoscalar Higgs final states to box-shaped features. By contrast, for neutralino DM, the di-photon final state is only enhanced in the resonance with a Z boson and box-shaped features are even more suppressed. Therefore,more » the observation of spectral features could constitute a discriminating factor between both models. In addition, we compare our results with direct DM searches, including the SuperCDMS and LUX limits on the elastic DM-nucleus scattering cross section and show that some of these scenarios would be accessible to next generation experiments. Thus, our findings strengthen the idea of complementarity among distinct DM search strategies.« less
Authors:
 [1] ; ;  [2]
  1. Department of Physics, Institute for Particle Physics Phenomenology, Durham University, South Street, Durham DH1 3LE (United Kingdom)
  2. Instituto de Física Teórica UAM/CSIC, Universidad Autónoma de Madrid, Nicolás Cabrera 13-15, 28049 Madrid (Spain)
Publication Date:
OSTI Identifier:
22524896
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2016; Journal Issue: 04; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANNIHILATION; BREIT-WIGNER FORMULA; CERN LHC; COMPARATIVE EVALUATIONS; CROSS SECTIONS; GALAXIES; GAMMA RADIATION; GAMMA SPECTRA; HIGGS BOSONS; HIGGS MODEL; LIMITING VALUES; MASS; NONLUMINOUS MATTER; PHOTONS; SATELLITES; SPARTICLES; STANDARD MODEL; SUPERSYMMETRY; Z NEUTRAL BOSONS