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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"W bosons"”.
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Pair production of W bosons in electron positron annihilation
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1998.
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Precision Physics with W-bosons at the Large Hadron Collider
Weak bosons are by now a well-established and observed block of the elementary particles table, but the era of Precision Physics opens up new ways of utilising them in an attempt to uncover the mystery of physics beyond the Standard Model. Being central to what is called Electroweak Symmetry …
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Search for the Standard Model Higgs boson decaying to two W bosons at CMS
… Hadron Collider, through its decay mode to two W bosons, which each in turn decay into a charged lepton and a neutrino. The Higgs boson is the only elementary particle predicted by the Standard Model of particle physics which has not yet been experimentally observed. The question of its existence …
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Bestimmung der Masse und Breite des W-Bosons im semileptonischen Zerfallskanal mit dem OPAL Detektor bei LEP
… zur Bestimmung der Masse des geladenen Eichbosons der schwachen Wechselwirkung. Die Methode wurde ausgeweitet auf eine gleichzeitige Bestimmung der Masse Mw und der Zerfallsbreite Gw des W-Boson genannten Eichbosons. Analysiert wurden dazu Daten, die mit dem OPAL-Experiment in den Jahren …
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Observation of the electroweak production of two same-sign W bosons in proton-proton collisions with the ATLAS detector
The production of same sign WW bosons (W±W±) is an extremely rare process predicted within the Standard Model (SM). It results from electroweak mediated processes such as Vector Boson Scattering (VBS), a process linked with electroweak symmetry breaking. Therefore, an observation of the W±W± VBS …
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Vector boson production with the ALICE detector
… and investigate the production of massive vector bosons (W+ and W−). This a priori mentioned production is not sensitive to hot nuclear matter effects because of the weak coupling nature of these vector bosons. Thus, in heavy ion collisions they provide a good reference for the medium-induced …
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Measurement of W Boson Polarization in Top Quark Decay
… prediction for the fraction longitudinal W bosons from top decays, it is of particular interest for study. This thesis presents a measurement of W boson polarization in top quark decays through an analysis of the co9 distribution in the lepton-plus-jets channel of the tt candidate events …
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W boson cross sections and single spin asymmetries in polarized proton-proton collisions at [square root of] s =500 GeV at STAR
… look at the spin-dependent production of W+(-) bosons, and hence at the spin-flavor structure of the proton, where the main production mode is through d+u (u+d) annihilation. Using STAR's large Time Projection Chamber and its wide-acceptance electromagnetic calorimeters, it is possible to …
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Observation of electroweak W±W± JJ production with the CMS experiment
… predictions regarding the production of two W bosons with the same charge accompanied by two jets. In particular, when these particles are produced in a topology where the jets have a high invariant mass and are largely separated in pseudo-rapidity, the data can be used to test Standard Model …
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Suche nach der Produktion einzelner Top-Quarks mit dem OPAL-Detektor
… Hierzu wird im hadronischen Zerfallskanal des W-Bosons nach dem Prozess e+e- -> tc(u) -> bWc(u) gesucht. Die Selektion der Ereignisse beruht auf der kinematischen Rekonstruktion und dem Auffinden von b-Hadronen. Mehrere sensitive Variablen werden mit einer Likelihood-Methode kombiniert. Die …
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Study of the Higgs Boson Produced in Association with a Weak Boson and Decaying to WW* with a Same Sign Dilepton and Jets Final State in √ s =8 TeV pp Collisions with the ATLAS Detector at the LHC
… has the associated W boson and one of the W bosons from the Higgs decaying leptonically, while the last W boson decays hadronically, giving two leptons, jets, and missing transverse energy as the final state signature in the ATLAS detector. The two leptons are required to have the same sign …
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Suppression of the fake lepton background in same-sign W-boson scattering with the ATLAS experiment
… the ATLAS detector's Run 2. The two scattered W-bosons decay leptonically leaving a distinctive experimental signature of two same-sign leptons, two forward jets, and missing transverse energy carried away by two neutrinos. Non-prompt leptons are defined as leptons coming from the decay of …
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Precision measurement of the W boson mass with the CMS Experiment in pp collisions at √s = 13 TeV
… at √s = 13 TeV. The phenomenology of W bosons produced in pp collisions, the CMS detector characteristics, and other relevant factors are examined to justify the overall strategy to measure mW from the muon transverse momentum and pseudorapidity spectrum [formula] in the W → µν channel …
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Placing limits on the Higgs production cross section at the tevatron using the H to W+W- to l+l- decay channel
… gluon fusion and then decaying in to two W bosons. Only leptonic decay channel software considered, such that the final event signature consists of ee, eu, or uu with missing energy from undetected neutrinos. After an evaluation of alternative techniques, a neural net was selected as the …
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Bestimmung der Massen der elektroschwachen Eichbosonen bei L3
… Standard Model of Particle Physics, the gauge bosons W and Z. The masses are determined using the kinematics of the bosons' decay products. The data were collected by the L3 experiment at the Large Electron Positron Collider (LEP) at centre-of-mass energies, sqrt(s), between 183 GeV and 209 GeV …
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Analysis of Events with Isolated Leptons and Missing Transverse Momentum in ep Collisions at HERA
… are expected mainly from production of real W bosons with subsequent leptonic decay. This thesis continues the analysis of such events done in the HERA-1 period where an excess over the SM prediction was observed for events with high hadronic transverse momentum PTX > 25 GeV. New data of the …
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Search for Anomalous Production of Single Top Quarks with the H1 Experiment at HERA
… als auch für hadronische Zerfallsmoden des W-Bosons untersucht. Die Trennung des Top-Signals vom Standardmodelluntergrund erfolgt mittels einer multivariaten Analyse. Die gesamten mit dem H1-Experiment aufgenommenen HERA I Daten, entsprechend einer integrierten Luminosität von 118 pb^-1, …
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Rare phenomena and W production in electron proton scattering at HERA
… hadronic system. Complementary, a search for W bosons in the dominant hadronic decay channel is performed. The phase space is optimised to maximise the acceptance for W events and reduce other Standard Model contributions. The data are compared to the predictions of quantum chromodynamics as a …
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Monte Carlo simulations using infrared improved DGLAP-CS theory.
A large number of Z and W bosons will be produced at the LHC. A careful study of their properties in the presence of QCD background processes, will be important in studying the Standard Model more rigorously and to uncover new physics which may appear through radiative corrections or through new …
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