Interpretation of searches for supersymmetry with simplified models

The results of searches for supersymmetry by the CMS experiment are interpreted in the framework of simplified models. The results are based on data corresponding to an integrated luminosity of 4.73 to $4.98{\mathrm{fb}}^{-1}$. The data were collected at the LHC in proton–proton collisions at a center-of-mass energy of 7 TeV. This paper describes the method of interpretation and provides upper limits on the product of the production cross section and branching fraction as a function of new particle masses for a number of simplified models. These limits and the corresponding experimental acceptance calculations can be used to constrain other theoretical models and to compare different supersymmetry-inspired analyses.

Figure 1

OS dileptons [21]: Product of the experimental efficiency and acceptance (left) and the upper limit on the product of the cross section and branching fraction (right) for the T3lh model from the ${\mathrm{E̸}}_{\mathrm{T}}$ and $H_{\mathrm{T}}$ selection (top) and from edge reconstruction (bottom). Results are shown as a function of gluino and LSP mass, with the intermediate neutralino mass set using $x=0.5$.

Figure 2

Exclusion limits for the masses of the mother particles, for $m_{\mathrm{LSP}}=0\mathrm{GeV}$ (dark blue) and $m_{\mathrm{mother}}-m_{\mathrm{LSP}}=200\mathrm{GeV}$ (light blue), for each analysis, for the hadronic and razor results (left) and the leptonic results (right). The limits are derived by comparing the allowed $[\sigma \times \mathcal{B}{]}_{\mathrm{UL}}$ to the theory described in the text. For the T3, T5, and TChiSlepSlep models, the mass of the intermediate particle is defined by the relation $m_{\mathrm{int}}=x{m}_{\mathrm{mother}}+(1-x)m_{\mathrm{LSP}}$. For the T3w and T5zz models, the results are presented for $x=0.25$, 0.5, 0.75, while for the T3lh, T5lnu, and TChiSlepSlep models, $x=0.5$. The lowest mass value for $m_{\mathrm{mother}}$ depends on the particular analysis and the simplified model.

Figure 3

Best exclusion limits for the masses of the mother particles, for $m_{\mathrm{LSP}}=0\mathrm{GeV}$ (dark blue) and $m_{\mathrm{mother}}-m_{\mathrm{LSP}}=200\mathrm{GeV}$ (light blue), for each simplified model, for all analyses considered. For the T3, T5, and TChiSlepSlep models, the mass of the intermediate particle is defined by the relation $m_{\mathrm{int}}=x{m}_{\mathrm{mother}}+(1-x)m_{\mathrm{LSP}}$. For the T3w and T5zz models, the results are presented for $x=0.25$, 0.5, 0.75, while for the T3lh, T5lnu, and TChiSlepSlep models, $x=0.5$. The lowest mass value for $m_{\mathrm{mother}}$ depends on the particular analysis and the simplified model.

Figure 4

The 95% C.L. exclusion limits on the produced particle and LSP masses in the models T1(T1bbbb), T2(T2bb), T5zz, T3w, T1tttt, and T5gg(T5wg). The grey area represents the region where the decay mode is forbidden.

Figure 5

The 95% C.L. exclusion limits and the predicted cross section for the produced particle masses with a fixed LSP mass in the models T1(T1bbbb), T2(T2bb), T1tttt, T2tt, TChiSlepSlep. and TChiwz.