Abstract
The first search for supersymmetry in the vector-boson fusion topology is presented. The search targets final states with at least two leptons, large missing transverse momentum, and two jets with a large separation in rapidity. The data sample corresponds to an integrated luminosity of 19.7 inverse femtobarns of proton-proton collisions at sqrt(s) = 8 TeV collected with the CMS detector at the CERN LHC. The observed dijet invariant mass spectrum is found to be consistent with the expected standard model prediction. Upper limits are set on the cross sections for chargino and neutralino production with two associated jets, assuming the supersymmetric partner of the tau lepton to be the lightest slepton and the lightest slepton to be lighter than the charginos. For a so-called compressed-mass-spectrum scenario in which the mass difference between the lightest supersymmetric particle and the next lightest, mass-degenerate, gaugino particles is 50 GeV, a mass lower limit of 170 GeV is set for these latter two particles.
Highlights
CMS detectorThe central feature of the CMS apparatus is a superconducting solenoid of 6 m internal diameter, providing a magnetic field of 3.8 T
Background estimationThe general methodology used to evaluate the background is the same for all final states
Where NBprGed is the predicted background yield in the signal region, NBMGC(central) is the rate predicted by the “BG” simulation for the central selection, SFBCGR1(central) is the data-to-simulation correction factor for the central region, given by the ratio of data to the “BG” simulation in control region CR1, and vector-boson fusion (VBF) efficiency, determined as a function of mjj in data control sample CR2 or, in the case of VV events, from simulation
Summary
The central feature of the CMS apparatus is a superconducting solenoid of 6 m internal diameter, providing a magnetic field of 3.8 T. Located within the solenoid volume are a silicon pixel and strip tracker, a lead tungstate electromagnetic calorimeter (ECAL), and a brass and scintillator hadron calorimeter. Muons are measured in gas-ionisation detectors embedded in the steel flux-return yoke outside the solenoid. Extensive forward calorimetry complements the coverage provided by the barrel and endcap detectors. The inner tracker measures charged tracks with |η| < 2.5 and provides an impact parameter resolution of ≈ 15 μm and a transverse momentum resolution of about 1.5% for 100 GeV charged particles. A detailed description of the CMS detector, along with a definition of the coordinate system and relevant kinematic variables, can be found in ref. A detailed description of the CMS detector, along with a definition of the coordinate system and relevant kinematic variables, can be found in ref. [22]
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