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Showing 1 to 20 of 26 for “"Top quarks."”.
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Targeting Natural Supersymmetry With Top Quarks
… supersymmetry via the production of light top squarks (stops) with the ATLAS experiment, using 13 TeV proton-proton collision data delivered by the Large Hadron Collider. A range of models is considered where the stop may decay to top quarks, b jets, and a variety of other supersymmetric …
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A search for top quarks in PP collisions using dileptons
… ti -+ w+ bW-b -+ f+z;bf-vb where one of the b quarks is explicitly identified. In a sample of 109.4 ± 7.2 pb-1 of data, 6 tags in 4 events are found with an expected background of 1.53 ± .33 events. This results in an estimated production cross section of 4.6!tt pb at mtop = 175 Ge V / c2
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Suche nach der Produktion einzelner Top-Quarks mit dem OPAL-Detektor
… dies für die ersten beiden Generationen von Quarks bestätigt werden. Für die dritte Generation, speziell für das Top-Quark, existieren bisher nur wenige experimentelle Erkenntnisse über FCNC-Prozesse. Durch theoretische Erweiterungen des SM können, aufgrund der extrem großen Masse des …
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A search for top quarks in proton-antiproton collisions using dileptons
… \nu b\ell\sp-\nu\bar b$ where one of the b quarks is explicitly identified. In a sample of 109.4 $\pm$ 7.2 pb$\sp{-1}$ of data, 6 tags in 4 events are found with an expected background of 1.53 $\pm$.33 events. This results in an estimated production cross section of 4.6$\sbsp{-3.1}{+4.4}$ pb …
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Measurement of Higgs couplings to top quarks and τ leptons with the ATLAS detector
Since the discovery of the Higgs boson in 2012 during the first run of the Large Hadron Collider (LHC) at CERN, extensive measurements have been performed to characterize its properties. Its mass, spin, parity and couplings have been studied in detail with no significant deviations from the SM …
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Search for Anomalous Production of Single Top Quarks with the H1 Experiment at HERA
Eine Suche nach der Produktion einzelner Top-Quarks durch flavor-ändernde neutrale Ströme in ep-Kollisionen wird vorgestellt. Die Suche ist motiviert durch die Beobachtung von Ereignissen mit dem H1-Detektor, die ein isoliertes Lepton sowie einen hohen fehlenden und einen hohen hadronischen …
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A Search for the Higgs Boson Produced in Association With Top Quarks in Multilepton Final States at Atlas
… for Higgs boson production in association with top quarks in multilepton final states. The search was conducted in the 2012 dataset of proton-proton collisions delivered by the CERN Large Hadron Collider at a center-of-mass energy of 8 TeV and collected by the ATLAS experiment. The dataset …
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Searching for the Higgs Boson Produced in Association with a Pair of Top Quarks in Multilepton Final States Using the ATLAS Detector at the LHC
… production of a Higgs boson with a pair of top quarks using final states with multiple leptonic objects. An integrated luminosity of 36.1 fb−1 of proton-proton collision data was used, collected during 2015 and 2016 at a centre-of-mass energy of √s = 13 TeV with the ATLAS detector at the …
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Measurement of the top quark mass from top quarks produced in proton-proton collisions at √s = 13 TeV that decay to dimuons via a J/ψ
The top quark mass is measured using tt → lepton + J/ψ(→ µ +µ −) events, using proton-proton collision data collected by the ATLAS detector at a centre-of-mass energy of √ s = 13 TeV, during 2015-2018. The data corresponds to a total integrated luminosity of 139.0 fb−1 . This lepton + J/ψ channel …
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Study of the production processes of top quarks and missing energy predicted by the Standard Model and its extensions, in leptonic final states with the CMS detector at the LHC using machine learning techniques
… más allá del ME relacionadas con el quark top en estados finales con leptones. Para ello, se han utilizado datos de colisiones protón-protón producidas en el LHC y recogidas por el experimento CMS del CERN. Se ha realizado la primera medida de la sección eficaz del proceso de producción de …
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Identifying boosted objects with N-subjettiness and linear k-means clustering
… objects (with a particular focus on tagging top quarks) at particle accelerators such as the Large Hadron Collider. Combined with an invariant mass cut on jets, N-subjettiness is a powerful discriminating variable for tagging boosted objects such as top quarks and rejecting the fake …
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Measurement of the Top Quark-Antitop Quark Differential Cross Section, dsigma/dM(tt), in Proton-Antiproton Collisions at Center of Mass Energy = 1.96 TEV
… for Kaluza Klein gravitons which decay to top quarks. I find kappa/MPl > 0.16 at the 95% confidence level.
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A search for the lightest supersymmetric partner of the top quark at DO
… of the light supersymmetric partner of the top quark (t˜1) in 5.4+/-0.3 fb-1 of data from the DO detector at a pp¯ center-of-mass energy of 1.96 TeV at the Fermilab Tevatron collider. The scalar top quarks are assumed to decay into a b quark, a charged lepton and a scalar neutrino …
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J / ( ) production in heavy ion collisions at the STAR detector at RHIC
… subsequent discovery of the charm, bottom, and top quarks, and the Z, W±, and Higgs bosons. The theory of Quantum Chromodynamics (QCD), which describes the strong interaction between quarks and gluons in the Standard Model, predicts a phase transition from hadronic matter to a deconfined Quark …
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Exclusive cone jet algorithms for high energy particle colliders
… search for heavy resonances, Higgs bosons, and top quarks at various momenta and show that it reconstructs these particles with efficiencies between 60% and 80% without any additional substructure techniques, and maintains this efficiency over a wide kinematic range. This algorithm provides many …
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Study of a short distance top mass with a cross-section at NNLL + NNLO
We consider top-quarks produced at large energy in e+e- collisions and address the question of what top-mass can be measured from reconstruction. The production process is characterized by the center-of-mass energy, Q, the top mass, m, the top decay width, It, and also AQCD. These scales are well …
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Phänomenologische Konsequenzen der Fermion-Massenerzeugung in Substrukturmodellen
… des Massenspektrums und der Mischung der Quarks und Leptonen ist die demokratische Massenmatrix. Damit erscheint der Mechanismus der Mischung der Quark-Masseneigenzustände in enger Analogie zur Mischung im System der neutralen pseudoskalaren Mesonen. Dies wird als Hinweis auf eine …
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Search for supersymmetric partners of the top quark with the CMS detector and novel top quark tagging algorithms.
… looked for evidence that the superpartner of the top quark was produced then decayed into an undetected particle and a top quark that decayed to hadronic jets. No statistically significant deviation from standard model expectations is observed. Limits are placed on the production cross section in …
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