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- W96282425 abstract "In this thesis we investigate thermal in-medium modifications of various mesonic correlation functions by lattice simulations of Quantum Chromodynamics for light valence quark masses and vanishing chemical potential. Mesonic properties are typically extracted from spatial correlation functions. The results presented are based on quenched gauge field configurations generated with the standard Wilson plaquette gauge action. Concerning the fermionic part of the action, we use the non-perturbative O(a) improved Sheikholeslami-Wohlert as well as the truncated hypercube perfect action. Furthermore we utilize the maximum entropy method in order to determine physically relevant pole masses and to investigate thermal modifications of physical states and possible lattice artefacts in the interacting case. The analyses of pole and screening masses, dispersion relations, wave functions, decay constants and spectral functions essentially yield no significant modifications of the zero-temperature behavior up to 0.55 Tc. Close to the phase transition in-medium effects seem to appear, which lead inter alia to significant differences between pole and screening masses. The decay constants are in good agreement with the experimental values. We have simulated above Tc at nearly zero quark masses. At 1.24 Tc, the occurrence of topological effects, a sign for the presence of a still broken U(1)A symmetry, prevent a more thorough analyses close to the phase transition. A complete continuum and infinite volume extrapolation of screening masses, guided by free lattice effective masses is done. It shows that the presence of collective phenomena at 1.5 and 3 Tc cannot be explained by pure lattice artefacts. Unlike the vector meson the pion is far from being considered an unbound state." @default.
- W96282425 created "2016-06-24" @default.
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- W96282425 date "2016-04-13" @default.
- W96282425 modified "2023-09-27" @default.
- W96282425 title "Mesonic Correlation Functions from Light Quarks and Their Spectral Representation in Hot Quenched Lattice QCD" @default.
- W96282425 hasPublicationYear "2016" @default.
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