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Showing 1 to 20 of 20 for “"quark model"”.
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A quark model for nuclear matter
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1985.
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Thomas-Fermi quark model and techniques to improve lattice QCD calculation.
… this thesis. In the first part a semiclassical quark model, called the Thomas-Fermi quark model, is reviewed. After a modified approach to spin in the model is introduced, I present the calculation of the spectra of octet and decuplet baryons. The six-quark doubly strange H-dibaryon state is …
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Use of simple-harmonic forces in the non-relativistic quark model
… spectrum is similar to that predicted by a paraquark harmonic-oscillator shell model. ""Exact three-body Schroedinger wave functions are used to compute the N~partial decay widths, assuming the pion emission takes place via a one-quark de-excitat~on, . The agreement with experiment is …
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A relativistic quark model for mesons based on numerical solutions of the bethe-salpoter equation.
Massachusetts Institute of Technology. Dept. of Physics. Thesis. 1972. Ph.D.
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An equation for meson states in the quark model and its application to a meson bootstrap
… equation under the conditions of the quark model. The equation is shown to imply mass relations of the form K* 2 - P2 = K2 2 - 1£ • The equation is used to attempt bootstrap calculations of the vector and pseudo-scalar meson parameters in the quark model. A bootstrap is found for the …
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All Dressed Up And Ready To Go: A Tale Of Two Quarks.
… 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 reconcile with the conventional …
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Cold, dense quark matter
This thesis discusses the properties of cold quark matter as exists in the core of massive neutron stars, with baryon densities several times of nuclear saturation density, n_0 ≈ 0.16 fm^-3, at zero temperature. Specifically, we study effective quark models, the symmetry pattern of different quark …
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Chiral symmetry breaking transitions in holographic duals
… theories. We use the D3/D7 and D3/D5 systems to model both 3+1 and 2+1 dimensional, strongly coupled, gauge theories with quark fields. We show that chiral symmetry breaking is induced by either an imposed running coupling/dilaton profile or a background magnetic field. We explore the low energy …
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An analysis of pion photoproduction
… are also compared with previous solutions and quark model predictions.
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Meson Photo-Couplings From Lattice Quantum Chromodynamics
… arising within the context of the constituent quark model before transitioning to a lattice calculation of the spectrum of isovector mesons in a version of QCD featuring three flavors of quarks all tuned to approximately the physical strange quark mass. We then proceed to calculate radiative …
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A Study of the Λ(1405) in Lattice QCD
… though it contains a heavier valence strange quark and has odd parity, with an energy of 1405 MeV it lies lower than any other excited spin-1/2 baryon. In the almost 50 years since its discovery there has been significant effort expended to describe the structure of the Λ(1405), however there …
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The Structure of Baryon Resonances
… data, insight is gained into the degree of model-dependence in the infinite-volume and finite-volume quantities. This formalism is extended for the first time to systems with multiple quark- model like baryon states. By considering the effect of a second bare basis state on both the …
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Quantum Monte Carlo Calucations Of Three And Six-Quark States
Quantum Monte Carlo techniques are applied to quark descriptions of single baryon and nuclear systems using a non-relativistic constituent quark model Hamiltonian. The assumed interaction includes a three-body term arising due to flux-tube confinement, and two-body interactions arising from …
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Spin Structure Functions of the Deuteron Measured with CLAS in and Above the Resonance Region
… to the nucleon spin fraction carried by quarks. The interesting behavior in the transition region is dominated by baryon resonance excitations. We concluded an experiment to measure these observables for deuterium as part of the “EG1” run group in Jefferson Lab's Hall B. We used a highly …
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Thomas Fermi model for mesons and new noise subtraction techniques in lattice QCD.
Lattice QCD calculations of quark loop operators are extremely time-consuming to evaluate. To calculate these diagrams we use stochastic noise methods, which employ a randomly generated set of noise vectors to project out physical signals. This is done with linear equation solvers like GMRES-DR …
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Electromagnetic Form Factors of Hadrons in the Space-Like Region
… nement hypothesis. This hypothesis states that quarks and gluons, the fundamental degrees of freedom in the strong force form together into complex bound states called hadrons, rather than appearing as free particles. Thus the study of the strong force becomes the study of hadrons and their …
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Electromagnetic properties of baryons from lattice QCD
… simulations to be performed efficiently at quark masses as low as 300 MeV. By combining FLIC fermions with an improved conserved vector current we ensure that discretization errors occur only at Ο ( α ² ) while maintaining current conservation. Magnetic moments, charge radii and magnetic …
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The scattering of spinning hadrons from lattice QCD
… calculation. I work at heavier than physical quark masses at the $\text{SU}(3)_{\text{F}}$ point where the up, down and strange quarks are mass degenerate. Finite-volume spectra are calculated and, utilising the relationship between the discrete energy spectrum and the infinite-volume …
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Few body problems in nuclear and particle physics
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-08T16:17:27Z No. of bitstreams: 1 1983_carlson.pdf: 4348858 bytes, checksum: 6ce5277d5cb0c37d5c05c29b8172fc7c (MD5)