Search for Dark Matter in Z+MET Evenets with the CMS Detector at $\sqrt{s}$ = 13 TeV

In this analysis, the dark matter production in proton-proton collisions at the Large Hadron Collider (LHC) at √s = 13 TeV with a Z boson and missing trans- verse energy based on simplified models is investigated. Different selection criteria are applied on data recorded by the CMS detector and Monte Carlo simulations of the standard model background and signal events in order to reduce the back- ground and gain a good signal sensitivity for possible dark matter signals in the missing transverse energy distribution. The systematic uncertainties are esti- mated for the background in the signal regions. No significant excess of data events is observed in the signal region. Model- independent 95% confidence level upper limits on cross sections for beyond stan- dard model processes with Z+MET are calculated, as well as 95% confidence level upper limits on cross sections for different simplified model dark matter production scenarios. These limits are the first of their kind for a center of mass energy of 13 TeV.