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Full-Text Articles in Physics
Exotic Mesons In Quenched Lattice Qcd, James E. Hetrick, C. Bernard
Exotic Mesons In Quenched Lattice Qcd, James E. Hetrick, C. Bernard
All Faculty Articles - School of Engineering and Computer Science
Since gluons in QCD are interacting fundamental constituents just as quarks are, we expect that in addition to mesons made from a quark and an antiquark, there should also be glueballs and hybrids (bound states of quarks, antiquarks and gluons). In general, these states would mix strongly with the conventional q-bar-q mesons. However, they can also have exotic quantum numbers inaccessible to q-bar-q mesons. Confirmation of such states would give information on the role of "dynamical" color in low energy QCD. In the quenched approximation we present a lattice calculation of the masses of mesons with exotic quantum numbers. These …
The Equation Of State For Two Flavor Qcd At N_T=6, James E. Hetrick, C. Bernard
The Equation Of State For Two Flavor Qcd At N_T=6, James E. Hetrick, C. Bernard
All Faculty Articles - School of Engineering and Computer Science
We improve the calculation of the equation of state for two flavor QCD by simulating on Nt = 6 lattices at appropriate values of the couplings for the deconfinement/chiral symmetry restoration crossover. For amq = 0.0125 the energy density rises rapidly to approximately 1 GeV/fm3 just after the crossover (mπ/mρ ≈ 0.4 at this point). Comparing with our previous result for Nt = 4 [1], we find large finite Nt corrections as expected from free field theory on finite lattices. We also provide formulae for extracting the speed of sound from the measured quantities.
Improving Flavor Symmetry In The Kogut-Susskind Hadron Spectrum, James E. Hetrick, T. Blum
Improving Flavor Symmetry In The Kogut-Susskind Hadron Spectrum, James E. Hetrick, T. Blum
All Faculty Articles - School of Engineering and Computer Science
We study the effect of modifying the coupling of Kogut-Susskind quarks to the gauge field by replacing the link matrix in the quark action by a “fat link,” or sum of link plus three-link paths. Flavor symmetry breaking, determined by the mass difference between the Goldstone and non-Goldstone local pions, is reduced by approximately a factor of 2 by this modification.