Determination of invisible Z boson+jets background to hadronic SUSY search

One of the most popular models beyond the Standard Model (SM) is Supersymmetry (SUSY). In many such models, decay chains of gluinos and squarks lead to the production of two Lightest Supersymmetric Particles (LSPs), which pass through the detectors without interactions. Thus, a classic signature of SUSY is the presence of events with large missing transverse energy ($E_{T}^{miss}$) and multiple jets. Many SM processes produce the same signatures and form background to SUSY signal. Z boson+jets production with $Z\to\nu\nu$ is one such process. The $Z\to\nu\nu$ background can be estimated by measuring the same process but where Z boson decaying into an opposite sign same flavour (OSSF) lepton pair (LP). In this study lepton pair is $\mu^{+}\mu^{-}$. We present procedures to estimate this background directly from data exclusively and also using a combination of data and simulated events. These studies were performed using simulated event samples at $\sqrt s$=14 TeV.