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 20 of 236 for “"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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Quarks and hadrons on the lattice
… as well as those obtained using dynamical quarks.
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Heavy quarks in effective field theories
Heavy quark physics serves as a probe to understand QCD, measure standard model parameters, and look for signs of new physics. We study several aspects of heavy quark systems in an effective field theory framework, including both phenomenological and formal applications. Phenomenological …
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Composite models of quarks and leptons
… the various constraints on composite models of quarks and leptons. Some dynamical mechanisms for chiral symmetry breaking in chiral preon models are discussed. We have constructed several "realistic candidate" chiral preon models satisfying complementarity between the Higgs and confining phases. …
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Transport theory for scalar quarks and gluons
… and constraint equations for a theory of scalar quarks and gluons with self-interactions. Special care has been taken in particular in understanding how the transport equation, taken on its own, leads to a Boltzmann-like equation when considered in the quasiparticle approximation. Through the …
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Quantum Chromodynamics and the Precision Phenomenology of Heavy Quarks
… theory of observable quantities involving quarks and gluons, the strongly interacting particles of the SM. Such calculations form the most important class of corrections to observables and are vital if we are to untangle signals of New Physics from LHC data. We consider in particular the …
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Electroweak measurements using heavy quarks identified in e⁺⁻ annihilation
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1998.
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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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Exploration of nucleon structure in lattice QCD with chiral quarks
… observables using the fundamental theory of quarks and gluons, QCD, simulated on a lattice. In our simulations, we use the full QCD action including Nf = 2+ 1 dynamical quarks in the SU(2) isospin limit. We compute the nucleon vector and axial vector form factors as well as the generalized …
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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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From quarks to cold atoms: the phases of strongly-interacting systems
In this thesis we investigate the phase structure of dense quark matter, the structure and stability of neutron and quark stars, and the phases of ultracold fermions in the presence of an artificial spin-orbit coupling. While spanning an extraordinary twenty orders of magnitude in energy scales, …
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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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All Dressed Up And Ready To Go: A Tale Of Two Quarks.
The existence of unexpected states (states not predicted by the conventional quark model) in heavy Quarkonia, specifically Charmonium and Bottomonium like states, is of great interest to modern particle physics. States like X(3872), Yb(10890), Zb(10610), and Zb(10650) have proven difficult to …
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The Runny Gauge Plasma: shear viscosity to entropy for quarks and gluons
Heavy ion experiments at the LHC and RHIC have supported the existence of a quark-gluon plasma (QGP), which is strongly coupled and behaves as an almost ideal fluid. We shall discuss both bulk thermodynamic and off-equilibrium transport properties of the QGP, within the theory of quantum …
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The left-right forward-backward asymmetry for B quarks at the SLD
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
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Particles Inside Particles: The Flow of Energy in Quarks, Gluons, and Jets
… introducing QCD and the scattering of partons (quarks and gluons), discussing jets as theoretical and experimental proxies for partonic physics, and presenting the partonic cascade model of jet formation and jet substructure. Noting the ubiquitous presence of low-energy pollution in particle …
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Properties of mesons and quarks under extreme conditions from Gauge-Gravity duality
… is concerned with the properties of mesons and quarks which live in the strongly coupled plasma of certain gauge theories which are similar to QCD. To study these plasmas we exploit gauge gravity duality which has been particularly useful for understanding QCD at temperatures above, but not far …
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Bound states of heavy and light quarks in the framework of quantum chromodynamics
The spectra of the D, F, B and E mesons have been calculated using the MIT bag model together with a static potential related to the Fourier transform of the "dressed" gluon propagator. The heavy quark has been assumed to coincide with the centre of the bag, while the Light antiquark was treated …
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