Sebastian Ordoñez
jsordonezs@unal.edu.co
3rd of December 2021
Final state: two leptons, \(E_{T}^{miss}\), two jets.
In order to calculate the non-prompt background, four lepton categories are used.
The reducible background is calculated by using:
My work!
Non-prompt muons in the signal region originate almost exclusively from \(b\) quarks coming from \(t\bar{t}\) events.
Motivation
Final selection
Non-prompt electrons in the signal region originate primarily from light flavour jets of \(W+jets\) events. However, it is not possible to achieve that composition using a trilepton region.
That is why we look for a similar composition coming from \(Z+jets\) events.
Final selection
Motivation
\(E_{T}^{miss}\) distribution for Non-Ana and Ana events
Signal Region
Trilepton muon Region
\(E_{T}^{miss}\) distribution in the Low \(m_{jj}\) region
The contribution of non-prompt muons in the Trilepton muon region is almost 50%. It was achieved a higher contribution than that of the LowMjj region.
\(m_{\mu\mu}\) distribution for Non-Ana and Ana events
Signal Region
Trilepton electron Region
The contribution of non-prompt Ana electrons in the Trilepton electron region is about 31%. Once again, it was achieved a higher non-prompt contribution than that of the LowMjj region.
It is investigated how well the collision data is modellled by the sum of the Monte Carlo predictions for the prompt background and the non-prompt background estimated by the data-driven technique.
The number of non-prompt events estimated by MC-data-driven in this region is singificantly above the MC events according to truth-level information.
\(p_{T}\) distribution for non-prompt muons
The number of MC-data-driven events is notably below the MC events according to truth-level information.
\(p_{T}\) distribution for non-prompt electrons
The result found in the MC closure is confirmed here. It is clear a not negligible overestimation of data.
\(m_{lll}\) distribution
It is clear a significant underestimation of the data. This underestimation is approximately a factor two in the non-prompt estimate.
Electron \(p_{T}\) distribution