Sebastian Ordoñez
jsordonezs@unal.edu.co
18th of May 2021
In the data-driven background estimation we use three orthogonal regions:
VR
SR
CR
\(F\) application
\(F\) validation
\(F\) extraction
In this Validation Region we apply the following selection flow:
We need to guarantee that fake muons have a \(p_{T}>27\) GeV in order to be able to apply the fake factor.
Ana leptons
\(E_{T}^{miss}\) distribution for Non-Ana events
\(E_{T}^{miss}\) distribution for Ana events
\(E_{T}^{miss}\) dist. in the Low \(m_{jj}\) VR
Number of events for each MC category and data in the trilepton muon VR
In order to test the Matrix Method, MC and data fake factors extracted from the dilepton Control Region are applied to events with one non-prompt Non-Ana muon.
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\(N_{A}^{fake}\) estimated by the MC-data-driven method is compared to \(N_{A}^{fake}\) which are actually non-prompt according to the MC truth level information (Non-prompt MC).
The method introduces the probability \(e_{i}\) (\(f_{i}\)) that a prompt (non-prompt) lepton passes the Ana requirements. The above equation is explicitly written as:
Where the bars mean the negation, i.e. the probability that a prompt (non-prompt) lepton does not pass the Ana selection. The fake factor is given by:
Study how well the data corresponds to the sum of MC predictions for all processes (Prompt MC) and Charge flip (Charge flip MC) and the non-prompt background estimated with the Matrix Method.
In an "ideal scenario" it would be expected that:
Fake muons \(p_{T}\) distribution
\(m_{lll}\) distribution
\(E_{T}^{miss}\) distribution
\(m_{jj}\) distribution
Leading jet \(p_{T }\) distribution
Subleading lepton \(p_{T }\) distribution
Leading lepton \(p_{T }\) distribution
Third lepton \(p_{T }\) distribution
Subleading jet \(p_{T }\) distribution
\(m_{lll}\) distribution
\(E_{T}^{miss}\) distribution
Leading lepton \(p_{T}\)
Leading jet \(p_{T}\)
Subleading jet \(p_{T}\)
\(m_{jj}\) distribution
Subleading lepton \(p_{T}\)
Third lepton \(p_{T}\)
In order to get a composition of non-prompt electrons as close as possible to the composition of the Signal Region the following selection flow is employed:
Next steps: Change the \(p_{T}\) electron cut to the begining, change to \(m_{lll} < 300\)GeV
Non-prompt Ana electrons in the Signal Region come mainly from Light Flavor Decay associated to \(W+jets\) and also there is a significant contribution of B Hadron Decay from \(t\bar{t}\).
Signal Region
Electron VR
\(E_{T}^{miss}\) distribution for Ana
\(E_{T}^{miss}\) distribution for Non-Ana