Abstract
A search for supersymmetric particles produced in the vector boson fusion topology in proton-proton collisions is presented. The search targets final states with one or zero leptons, large missing transverse momentum, and two jets with a large separation in rapidity. The data sample corresponds to an integrated luminosity of 35.9 fb−1 of proton-proton collisions at sqrt{s} = 13 TeV collected in 2016 with the CMS detector at the LHC. The observed dijet invariant mass and lepton-neutrino transverse mass spectra are found to be consistent with the standard model predictions. Upper limits are set on the cross sections for chargino left({tilde{upchi}}_1^{pm}right) and neutralino left({tilde{upchi}}_2^0right) production with two associated jets. For a compressed mass spectrum scenario in which the {tilde{upchi}}_1^{pm } and {tilde{upchi}}_2^0 decays proceed via a light slepton and the mass difference between the lightest neutralino {tilde{upchi}}_1^0 and the mass-degenerate particles {tilde{upchi}}_1^{pm } and {tilde{upchi}}_2^0 is 1 (30) GeV, the most stringent lower limit to date of 112 (215) GeV is set on the mass of these latter two particles.
Highlights
The 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 for the estimation of background contributions in the signal region (SR) is similar for all search channels and is based on both simulation and data
The main contributions to the total systematic uncertainty in the background predictions arise from the closure tests and from the statistical uncertainties associated with the data control regions (CR) used to determine the SFBCGR1(central), SFBCGR2(VBF), T FVBF, and T F∆φ factors
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. Muons are measured in gas-ionization detectors embedded in the steel flux-return yoke outside the solenoid. The inner silicon tracker measures charged tracks with |η| < 2.5 and provides an impact parameter resolution of approximately 15 μm and a transverse momentum resolution of about 1.5% for 100 GeV charged particles. Collision events of interest are selected using a two-tiered trigger system. The first level trigger (L1), composed of custom hardware processors, selects events at a rate of around 100 kHz. The second level trigger, based on an array of microprocessors running a version of the full event reconstruction software optimized for fast processing, reduces the event rate to around 1 kHz before data storage. A detailed description of the CMS detector, along with a definition of the coordinate system and relevant kinematic variables, can be found in ref. [24]
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