A Search For New Physics In Events With A Leptonically Decaying Z Boson And A Large Transverse Momentum Imbalance With The Cms Detector At The Lhc
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A Search for New Physics in Events with a Leptonically Decaying Z Boson and a Large Transverse Momentum Imbalance with the CMS Detector at the LHC
A search for new physics in events with a leptonically decaying Z boson and a large transverse momentum imbalance in proton-proton collisions collected at sqrt(s) = 13 TeV in 2016 with the Compact Muon Solenoid detector at the Large Hadron Collider is presented. The results of this search are interpreted in terms of a simplified model of dark matter production via spin-0 or spin-1 mediators, a scenario with a standard-model-like Higgs boson produced in association with the Z boson and decaying invisibly, a model of unparticle production, and a model with large extra spatial dimensions. No significant deviations from the background expectations are found, and limits are set on relevant model parameters, significantly extending the results previously achieved in this channel.
Search for a Dijet Resonance in Events with Jets and Missing Transverse Energy in Pp[over ̄] Collisions at Sqrt[s]
We report on a search for a dijet resonance in events with only two or three jets and large imbalance in the total event transverse momentum. This search is sensitive to the possible production of a new particle in association with a W or Z boson, where the boson decays leptonically with one or more neutrinos in the final state. We use the full data set collected by the CDF II detector at the Tevatron collider at a proton-antiproton center-of-mass energy of 1.96 TeV. These data correspond to an integrated luminosity of 9.1 fb{̂-1}. We study the invariant mass distribution of the two jets with highest transverse energy. We find good agreement between data and standard model background expectations and measure the combined cross section for WW, WZ, and ZZ production to be 13.8{̂+3.0}_{-2.7} pb. No significant anomalies are observed in the mass spectrum and 95% credibility level upper limits are set on the production rates of a potential new particle in association with a W or Z boson.
Estimation of the Invisible Z Background to Hadronic Supersymmetry Searches Performed with Proton-Proton Collision Data at 7 and 8 TeV Observed with the CMS Detector During the First Run of the CERN Large Hadron Collider
In searches for SUSY in all-hadronic channels, events with jets and a Z boson form an irreducible background when the Z boson decays to a pair of neutrinos. For R-parity conserving Susy models, every decay chain involving a superparticle must result in at least one lightest supersymmetric particle (LSP), which can be neutral and noninteracting. The detector signature for the LSP is identical to that of the two neutrinos from the Z, which appear as an imbalance in the transverse momentum of the event. The characterization of these types of events is crucially important in any search for new physics performed in a multi-jets+missing transverse momentum channel. A method for estimating this irreducible background using events with a measured photon is presented, and the results for a search performed in the all-hadronic multi-jet channel are shown to be consistent with standard model expectations. Limits are set on the mass of expected new particles in various models.