Rosado Trinidad, Ángel

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    Z to invisible background estimation for the stop quark search in all-hadronic final states for LHC run-2
    (2020-05-29) Rosado Trinidad, Ángel; Malik, Sudhir; College of Arts and Sciences - Sciences; Ramírez Vargas, Juan; Santana Colón, Samuel; Department of Physics; Alers Valentín, Hilton
    It is believed that the top squark (the superpartner of the top quark) is the lightest super-symmetric quark with a mass around 1 TeV, an energy range that can be explored with the LHC. Hence, many searches for supersymmetry concentrate their efforts on finding the top squark and processes related to it. Within the different SUSY models, some models predict the stop quark decays into a top quark and a neutralino, the lightest supersymmetric particle (LSP), which is a weakly interacting particle and thus invisible to the detector, only reflected as missing transverse momentum (MET). The problem is that many events are background, i.e., many events produce MET and mimic the signal, therefore an estimation of the different backgrounds is needed. Between the different backgrounds, the Z boson decaying into a pair of neutrinos, commonly known as Z invisible, is one of the biggest backgrounds in many SUSY models. There have been many methods to estimate the Z invisible background using dilep-ton control regions, photon control regions, and W+jets control regions. In recent iterations of the all-hadronic analysis a photon control region is being adopted to increase statistics. The work presented here consists of estimating the Z invisible background using dilepton control regions as a cross-check for the Z invisible background estimation used in the SUSY all-hadronic analysis. The estimation presented here uses Z going to leptons Monte Carlo simulation as Z invisible since both events are kinematically similar. With the dilepton control region, a shape correction factor and a normalization correction factor are calculated and applied to the Z to neutrinos Monte Carlo simulation to obtain a final prediction of the background. The data used in this work was collected by the CMS experiment during 2016, 2017, and 2018 runs (Run-2) for proton-proton collisions at the LHC and with a center-of-mass energy of 13 TeV and an integrated luminosity is 137 inverse femtobarns.