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Description
The W+Jets(s) fake background estimation for $H\rightarrow Sh \rightarrow 2\ell$ + jets final state is presented. This paper focuses on the $W$+Jet(s) background estimation for the for the BSM search $H\rightarrow Sh \rightarrow 2\ell$ + >= 2 jets analysis with the ATLAS detector. Background processes that produce the same leptonic plus missing transverse energy signature in the detector, but not naturally contain two leptons from $W$ or $Z$-bosons and neutrinos, are labelled as "fakes" and their presence needs to be accounted for. The process can be wrongly considered as signal when the $W$ decays leptonically and the jet is mis-idenfi?ed as a lepton. The number of fakes for the process is estimated from the observed yield in a set control region in the data. The calculation is carried out in a $W$+Jet(s) rich control region and is estimated with fake factor to the signal region. The calculation of the fake factor is done in $Z$+Jet(s) samples (data and MC). The results are compared to fake factor calculations in the $W$+Jet(s) MC samples.