Multileptonic signals of co-annihilating left-right supersymmetric dark matter

We perform a comprehensive dark matter analysis of left-right supersymmetric scenarios that includes constraints from dark matter direct and indirect detection experiments and that presents distinctive features from those available in minimal supersymmetry. We concentrate on dark matter candidates which, while satisfying all constraints, are different from those of the minimal supersymmetric standard model. We consider in our analysis all possible co-annihilation channels relevant for setups in which several states are light and nearly degenerate, and devise a set of representative benchmark points, requiring co-annihilations, which satisfy all restrictions. We then study their consequent LHC signals, which exhibit promising new multileptonic signatures involving $W_R$, that if observed, would provide a strong support for left-right supersymmetry.

Figure 1

Dependence of the relic density (left) and direct detection cross section (right) on the right-handed sneutrino mass. We find a viable solution, with respect to present cosmological data, for sneutrino masses around 250 GeV. The results do not include DM co-annihilation with any other sparticle.

Figure 2

Distribution of the mass difference between the sneutrino LSP and the NLSP, given as a function of the sneutrino mass. For each point, the relic density matches the Planck value thanks to the bidoublet Higgsino-like neutralinos and charginos that are nearly degenerate and not too much heavier.

Figure 3

Photon number density spectrum (left) as derived from the primary gamma-ray flux originating from DM annihilation into right-handed neutrinos, shown as a function of energy. Results are presented for a showcase scenario in which $m_{\mathrm{DM}}=400\mathrm{GeV}$ and for electron (red) and muon (green) neutrinos of 130 GeV, as well as for both the $\mathbf{BP}\mathbf{4}$ (blue) and $\mathbf{BP}\mathbf{5}$ (orange) scenarios. The upper limits on the DM annihilation cross-section at the 95% confidence level, derived from Fermi dSPhs data, are also shown for both the right-handed electron and muon channels as a function of the DM mass (right).

Figure 4

Statistical significance of the best signal region ($\mathbf{D}\mathbf{16}$) for an integrated luminosity of $3000{\mathrm{fb}}^{-1}$ and for the five chosen benchmark points. The uncertainties on the background are assumed similar to the current ones (at $35.9{\mathrm{fb}}^{-1}$) and we study the dependence of the results on the mass of the $W_R$ boson.