“…Here, in particular the determinations of lepton trigger, identification and charge efficiencies, lepton-energy and missing-ET scales and resolutions as well as QCD backgrounds from fake electrons are considered.…”
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“…Even if the core of the tracking software has not changed in years, several important improvements have been developed recently to increase the reconstruction efficiency of charged hadrons, reduce the rate of fake tracks and refine the overall quality of the reconstructed trajectories. …”
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“…The tracking of charged particles will be possible down to about 100 MeV/c, with good efficiency and negligible fake rate. The yield of charged kaons and protons can be extracted for total momenta below 0.8 and 1.5 GeV/c, respectively. …”
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“…Millions of cosmic rays recorded by the ATLAS detector in fall 2008 and summer 2009 were used to commission the charged lepton identification algorithms. Fake tau candidates allowed the verification of the distribution of tau identification variables predicted by Monte-Carlo simulations. …”
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“…The performance of the electron reconstruction and identification has been studied on data. Efficiency and fake rate of different electron selections have been measured and compared to the Monte Carlo expectations.…”
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“…These data allow us to study QCD backgrounds, to evaluate methods to suppress the effects of jet-energy mis-measurement, to validate data-driven methods for predicting the MET distribution, and to measure background contributions from processes producing fake leptons.…”
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“…In this search, the variable $\alpha_{\rm T}$ was used as the main discriminator between events with real and fake missing transverse energy and no excess of events over the Standard Model expectation was found. …”
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“…In this search, the variable $\alpha_{\rm T}$ is used as the main discriminator between events with real and fake missing transverse energy, and no excess of events over the Standard Model expectation is found. …”
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“…Further dedicated triggers are provided for the collection of J/$Psi$$ ightarrow$ee, W$ ightarrow$e$ u$ and QCD background samples for calibration, efficiency and fake rate measurements. In the 2011 p-p data-taking period, the increasing luminosity and pile-up conditions at the LHC demanded the use of progressively higher energy thresholds and tighter selections to control the trigger rates. …”
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“…This has a significant impact on event reconstruction such as additional demands on CPU time and disk space as well as an increased probability to reconstruct fake tracks. Therefore the track and vertex reconstruction performance has been optimised in several high pile-up scenarios. …”
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“…The combination of both silicon and gas based detectors provides high precision impact parameter and momentum measurement of charged particles, with high efficiency and small fake rate. The ID has been used to exploit fully the physics potential of the LHC since the first proton-proton collisions at 7 TeV were delivered in 2009. …”
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“…It can assist in the rejection of fake muon triggers arising from background radiation without degrading the efficiency of the trigger. …”
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“…Extensions of the leptons MVA including new variables have been explored and some improvement was achieved in the rejection of the fake muons coming from light jets. Eventually the lepton MVA is found to give better performances with respect to the standard cut-based selections also in the context of SUSY analyses. …”
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“…It was found that there are clear relations between the amount of hits in the DUT and the fake efficiency for several parameters. Furthermore, the algorithm responsible for the association between hits and tracks was studied and improved.…”
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“…The NSW provide precise track segment information to the muon Level-1 trigger to reduce fake triggers. This contribution will summarize a detail of the NSW trigger decision system, track reconstruction algorithm implemented into the trigger processor and results of performance studies on the trigger system.…”
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“…The NSW provide precise track segment information to the muon Level-1 trigger to reduce fake triggers. This contribution will summarize a detail simulation of the NSW trigger decision system, track reconstruction algorithm implemented into the trigger processor and results of performance studies on the trigger system.…”
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“…Fitting the MVA scores while cutting on the missing mass estimator (MMC) and adding a theoretical uncertainty of 50% to the normalization of Z, ttbar real, and ttbar fake, gives a signal significance of 1.48 , trumping the signal significance of the current existing categories.…”
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“…Fitting the MVA scores while cutting on the missing mass estimator (MMC) and adding a theoretical uncertainty of 50% to the normalization of Z, ttbar real, and ttbar fake, gives a signal significance of 1.48 , trumping the signal significance of the current existing categories.…”
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“…Variable scanning and implementation of modified sequences and algorithms were implemented, to scan through multiple variables and find the optimal efficiency points while reducing reconstruction ghost rates i.e. fake tracks. Most of the optimization was focused on the Long tracks and Long high momentum (>5 GeV), and the reconstruction without the Velo tracker.…”
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“…For the validation of the performance and for the determination of the uncertainties of this method pseudoexperiments and a fake simulation are done.…”
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