Estimation of QCD Backgrounds to Searches for Supersymmetry

This note deals with techniques for estimating QCD multijet backgrounds to inclusive jets + ETMISS + leptons searches for Supersymmetry. The note documents how the backgrounds may be estimated using a data set with an integrated luminosity of 1 fb^-1 or less. The likely systematic and statistical uncertainties in such estimates are also discussed. Data-driven approaches discussed include jet smearing with functions derived from data and techniques for background estimation using control samples. Monte Carlo based techniques using a variety of generators and simulation tools are also discussed with a view to establishing their likely precisions and hence the optimum simulation strategy.