SUSY explanation of the Fermi Galactic Center Excess and its test at LHC Run-II

Abstract

We explore the explanation of the Fermi Galactic Center Excess (GCE) in the Next-to-Minimal Supersymmetric Standard Model. We systematically consider various experimental constraints including the Dark Matter (DM) relic density, DM direct detection results and indirect searches from dwarf galaxies. We find that, for DM with mass ranging from $30\mathrm{GeV}$ to $40\mathrm{GeV}$, the GCE can be explained by the annihilation $\chi \chi \to a^{\ast }\to b\bar{b}$ only when the CP-odd scalar satisfies $m_a\simeq 2m_{\chi }$, and in order to obtain the measured DM relic density, a sizable $Z$-mediated contribution to DM annihilation must intervene in the early universe. As a result, the higgsino mass $\mu$ is upper bounded by about 350 GeV. Detailed Monte Carlo simulations on the $3\ell +E_T^{miss}$ signal from neutralino/chargino associated production at 14-TeV LHC indicate that the explanation can be mostly (completely) excluded at $95\%$ C.L. with an integrated luminosity of 100(200) fb${}^{-1}$. We also discuss the implication of possible large $Z$ coupling to DM for the DM-nucleon spin dependent (SD) scattering cross section, and find that although the current experimental bounds on ${\sigma }_p^{\mathrm{SD}}$ is less stringent than the spin independent (SI) results, the future XENON-1T and LZ data may be capable of testing most parts of the GCE-favored parameter region.

6 pages, 3 figures

References in corpus (18)

• PYTHIA 6.4 Physics and Manual
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Dark Matter Results from 225 Live Days of XENON100 Data
• First results from DAMA/LIBRA and the combined results with DAMA/NaI
• Results from a Search for Light-Mass Dark Matter with a P-type Point Contact Germanium Detector
• micrOMEGAs2.0: a program to calculate the relic density of dark matter in a generic model
• Indirect search for dark matter with micrOMEGAs2.4
• Search for direct production of charginos, neutralinos and sleptons in final states with two leptons and missing transverse momentum in pp collisions at sqrt(s) = 8 TeV with the ATLAS detector
• Not so Coy Dark Matter explains DAMA (and the Galactic Center excess)
• Hidden Sector Dark Matter Models for the Galactic Center Gamma-Ray Excess
• NMSSM Interpretation of the Galactic Center Excess
• The Galactic Center Excess from the Bottom Up
• Updated cosmic-ray and radio constraints on light dark matter: Implications for the GeV gamma-ray excess at the Galactic center
• Light Neutralino Dark Matter: Direct/Indirect Detection and Collider Searches
• Antiproton constraints on the GeV gamma-ray excess: a comprehensive analysis
• Low-mass right-handed sneutrino dark matter: SuperCDMS and LUX constraints and the Galactic Centre gamma-ray excess
• Exploring the Higgs Sector of a Most Natural NMSSM and its Prediction on Higgs Pair Production at the LHC
• Supersymmetric Sub-Electroweak Scale Dark Matter, the Galactic Center Gamma-ray Excess, and Exotic Decays of the 125 GeV Higgs Boson

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• A taste of dark matter: Flavour constraints on pseudoscalar mediators
• WIMPs at the Galactic Center
• SUSY Implications from WIMP Annihilation into Scalars at the Galactic Centre
• NMSSM explanations of the Galactic center gamma ray excess and promising LHC searches
• The interpretation for Galactic Center Excess and Electroweak Phase Transition in the NMSSM
• $SU(2{)}_X$ Vector DM and Galactic Center Gamma-Ray Excess
• A Closer Look at CP-Violating Higgs Portal Dark Matter as a Candidate for the GCE
• $\mathcal{O}$(1) GeV dark matter in SUSY and a very light pseudoscalar at the LHC
• Dark matter properties implied by gamma ray interstellar emission models
• Implications of the Fermi-LAT Pass 8 Galactic Center Excess on Supersymmetric Dark Matter