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Showing 1 to 7 of 7 for “"ttbar"”.
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A Measurement of the Jet Multiplicity in Di-lepton Final States of ttbar Events
… the jet multiplicity in di-leptonically decaying ttbar events (i.e. ttbar → (ee, μμ, eμ) + missing transverse momentum + jets) is presented, using 4.66 fb -1 of data collected from √ s = 7 TeV pp collisions at the CERN Large Hadron Collider. In order to mitigate the effects of systematic …
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Studies at the CMS experiment on silicon microstrip module defects and on photon identification in semileptonic tt-events
… deals with the identification of semileptonic ttbar-events (electron and muon channel) containing photons that are radiated off top-quarks. A signature based Monte Carlo analysis reveals that the separation of the ttbar-events from the non-ttbar background (W + Jets, Z + Jets, di-boson, Photon …
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Search for a charged Higgs Boson in proton-proton collisions at the LHC using the ATLAS detector
… searches are conducted using the decay channel $\ttbar \rightarrow Wb \Hpm b$, with $\Hpm \rightarrow \tau_{had} \nu$ and the $W$ boson decaying hadronically ($\tau$+jets channel) or leptonically ($\tau$+lepton). The combination of the channels in this search excludes at 95$\%$ confidence level …
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Studie zur elektronischen Kalibration der Flüssig-Argon-Kalorimeter und zur Entdeckung unsichtbar zerfallender Higgs-Bosonen im ATLAS-Experiment
… durchgeführt. Dabei wurde der Produktionskanal ttbar H sowie der Gluon-Fusions-Kanal mit assoziiertem Jet untersucht. <br>Durch die Kombination des vollhadronischen $\ttbar H$-Endzustands und des semileptonischen ttbar H-Endzustands können unsichtbar zerfallende Higgs-Bosonen mit Massen $120 …
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Evaluation of a multi variated analysis for the selection of t-tbar multijet events in the current CMS implemented environment at LHC
… in the fully hadronic decay channel of ttbar events. We give a brief introduction to the role of the Top quark in the standard model and a general description of the CMS Experiment at LHC. We have used the CMS experiment computing and software infrastructure to generate and prepare the …
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Top quark mass measurement in the Lepton+Jets channel using full simulation of the CMS detector
… production cross section for top/antitop quarks (ttbar) is about 830 pb (NLO). The top quarks almost exclusively decay into a W boson and a b quark via the weak interaction. In about 44.4% of all events one of the top quarks decays into a lepton and neutrino while the other one decays into two …
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A Search For New Physics Using tt(bar) Resonances in the Lepton Plus Jets Channel at √(s) = 8 TeV in 20 fb⁻¹ of pp Collision Data at the ATLAS Experiment
Many Beyond Standard Model theories predict particles that couple strongly to top/anti-top quark pairs. This makes tt(bar) a promising signature for new physics searches. The analysis presented in this dissertation uses 20.3 fb⁻¹ of √s = 8 TeV pp collision data from the ATLAS experiment to search …