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SUSY explanation of the Fermi Galactic Center Excess and its test at LHC Run-II | | Junjie Cao
; Liangliang Shang
; Peiwen Wu
; Jin Min Yang
; Yang Zhang
; | | Date: |
13 Oct 2014 | | Abstract: | We explore the explanation of the Fermi Galactic Center Excess (GCE) in the
Next-to-Minimal Supersymmetric Standard Model. We systematically impose various
experimental constraints and perform a fit to the updated Higgs data. For each
surviving sample we further generate its gamma-ray spectrum from dark matter
(DM) annihilation and compare it directly with the Fermi data. We find that the
GCE can be explained by the annihilation $chi chi o a^ast o b ar{b}$
only when the CP-odd scalar satisfies $m_a simeq 2 m_chi$, 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 $3ell+ E_T^{miss}$ 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$^{-1}$. | | Source: | arXiv, 1410.3239 | | Services: | Forum | Review | PDF | Favorites | |
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