the approximate SM background constant-yield contours. The associated numbers indicate the SM yield suppression relative to the reference line marked “1”. Based on these kinematic properties, a 2D analytical description of the SM processes in the (${\ensuremath{M_R}\xspace}$, ${\ensuremath{R^2}\xspace}$) plane is developed.

![image](T2.pdf){width="48.00000%"} ![image](MR_T2_pheno.pdf){width="48.00000%"} ![image](RSQ_T2_pheno.pdf){width="48.00000%"} ![image](MR_T2_R2_pheno.pdf){width="48.00000%"}

Data taking and event selection\[sec:datana\]
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The CMS apparatus\[sec:cmsdet\]
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A hallmark of the CMS detector [@CMS:2008zzk] is its superconducting solenoid magnet, of 6 m internal diameter, providing a field of 3.8 T. The silicon pixel and strip tracker, the crystal electromagnetic calorimeter (ECAL), and the brass/scintillator hadron calorimeter (HCAL) are contained within the solenoid. Muons are detected in gas-ionization detectors embedded in the steel flux-return yoke, based on three different technologies: drift tubes, resistive plate chambers, and cathode strip chambers (CSCs). The ECAL has an energy resolution better than 0.5% above 100. The combination of the HCAL and ECAL provides jet energy measurements with a resolution $\Delta E/E \approx 100\% / \sqrt{E/\GeV} \oplus 5\%$.

The CMS experiment uses a coordinate system with the origin located at the nominal collision point, the $x$ axis pointing towards the center of the LHC ring, the $y$ axis pointing up (perpendicular to the plane containing the LHC ring), 