Global ETD Search
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 19 of 19 for “"Higgs bosons"”.
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Bestimmung der Kopplungsstruktur des Higgs-Bosons mit dem Atlas-Detektor
… der Standard-Modell <br>Spin-Paritaet des Higgsbosons vorgestellt und analysiert. Dazu wird die Kopplung des Higgs an Vektorbosonen ausgenutzt, und Vorhersagen der Winkel- und Massenverteilungen der Zerfallsprodukte des Standard-Modells mit den Vorhersagen fuer alternative Kopplungen …
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Search for Charged Higgs Bosons at centre-of-mass Energies of 189-209 GeV at LEP
In dieser Arbeit wird eine Suche nach geladenen Higgs Bosonen an dem Large Electron and Positron Speicherring (LEP) am CERN praesentiert. Es wurde speziell der Zerfall des geladenen Higgs Bosons (H^+/-) in ein CP-ungerades Higgs Boson (A^0) und ein virtuelles W Boson (W^*), am OPAL Detektor, …
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Precision Measurements of the Vector Boson Scattering Production and Searches for Charged Higgs Bosons at the Large Hadron Collider
… with two jets and a search for charged Higgs bosons (H superscript ±) decaying into a top and a bottom quark. The data samples used for the measurements are LHC proton-proton collisions recorded with the CMS detector during 2016–2018 at √𝑠 = 13TeV, corresponding to an integrated …
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Studies of b-associated production and muonic decays of neutral Higgs bosons at the ATLAS experiment within the Minimal Supersymmetric Standard Model
… thesis presents a Monte Carlo study of neutral Higgs bosons of the Minimal Supersymmetric Standard Model (MSSM) decaying into muons at the Atlas experiment at the CERN Large Hadron Collider. Signal and background processes are simulated using novel Monte Carlo generators that incorporate parts …
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Search for Higgs to invisible decays in vector boson fusion production
A search for invisibly decaying Higgs bosons is performed using the vector boson fusion production (VBF) mode. This search was conducted using Run 2 data, collected by the CMS detector at the LHC in 2016 at a center of mass energy of 13 TeV, corresponding to an integrated luminosity of 5.9 fb-1. …
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ATLAS Level-1 Jet Trigger Rates and study of the ATLAS discovery potential of the neutral MSSM Higgs bosons in b-jet decay channels
… of the ATLAS experiment of the neutral MSSM Higgs bosons in the decay channels with multi b-jet final state topologies, namely H -> h,h -> bb,bb and bb,A/H -> bb,bb, is performed. The signal acceptance of the ATLAS LVL1 jet trigger, based on the determined trigger thresholds, is evaluated. …
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Präzisionsrechnungen innerhalb und jenseits des Standardmodells
… und eine Analyse der Quantenzahlen des Higgs-Bosons im Zerfall H -> ZZ -> l^+l^- l^+l^- .
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Higher order and CP-violating effects in the neutralino and Higgs boson sectors of the MSSM
… results are presented for neutralino and Higgs decay processes of the form chi^0_i->chi^0_j h_a and h_a->chi^0_i chi^0_j in the MSSM with CP-violating parameters. An on-shell renormalisation scheme is developed for the chargino–neutralino sector that consistently takes into account …
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Supersymmetry at the dawn of the LHC era
… (SUSY). I show how copious production of Higgs bosons in SUSY events at the LHC can be a striking signal of multiple SUSY-breaking. In the context of anomaly mediation in supergravity, I demonstrate how goldstino couplings can be used as a probe of the underlying symmetry structure of …
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J / ( ) production in heavy ion collisions at the STAR detector at RHIC
… 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 Gluon Plasma (QGP) at high …
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Exclusive cone jet algorithms for high energy particle colliders
… using XCone to 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 …
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Search for exotic Higgs boson decays to four leptons with the ATLAS detector
Searches for exotic Higgs boson decays are well motivated by various theoretical models, as well as the constraints from Higgs boson measurement results. The focus is on exotic Higgs boson decays to a pair of beyond-the-Standard-Model spin-0 particles $a$. This dissertation conducts two analyses …
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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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Studie zur elektronischen Kalibration der Flüssig-Argon-Kalorimeter und zur Entdeckung unsichtbar zerfallender Higgs-Bosonen im ATLAS-Experiment
… für die Suche nach unsichtbar zerfallenden Higgs-Bosonen im ATLAS-Experiment auf. <br> <br>Im Rahmen der vorliegenden Arbeit wurde die Methode `free fit' zur elektronischen Kalibration der Flüssig-Argon-Kalorimeter des ATLAS-Experiments entwickelt. Diese wurde zusammen mit der …
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Phenomenology of the minimal <i>B - L</i> extension of the Standard Model at the LHC
… heavy neutrinos. In the gauge sector, the two Higgs fields mix. We derive the unitarity bound and the constraints from the renormalisation group equations study. In the allowed region of the parameter space, we delineate the phenomenology of the Higgs bosons and we show characteristic …
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The standard model in 5D : theoretical consistency and experimental constraints
… TeV-scale. We assume that some of the gauge and Higgs bosons propagate in one additional spatial dimension, while matter fields are confined to a four-dimensional subspace, the usual Minkowski space. After compactification on an S^1/Z_2 orbifold, an effective four-dimensional theory is obtained …
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Search for a charged Higgs Boson in proton-proton collisions at the LHC using the ATLAS detector
… thesis documents several searches for charged Higgs bosons ($H^{\pm}$) in the decay $H^{\pm} \rightarrow \tau_{had} \nu$, which are performed using data recorded in 2011 and 2012 by the ATLAS detector at the LHC. The $H^{\pm}$ bosons are predicted by some extensions of the Standard Model (SM) …
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Observation of upsilon suppression, search for long-lived particles, and observation of B0s → micro + micro-- at the LHC with the CMS experiment
… context of two specific models. In the first, Higgs bosons decay to a pair of long-lived neutral bosons, each of which decays to dileptons. In the second, events contain a pair of squarks that each decay to a long-lived neutralino, each of which in turn decays to dileptons and a neutrino. We …