Kaczmarek, Olaf and Karsch, Frithjof and Kitazawa, Masakiyo and Soeldner, Wolfgang (2012) Thermal mass and dispersion relations of quarks in the deconfined phase of quenched QCD. PHYSICAL REVIEW D, 86 (3): 036006. ISSN 1550-7998,
Full text not available from this repository. (Request a copy)Abstract
Temporal quark correlation functions are analyzed in quenched lattice QCD for two values of temperature above the critical temperature (T-c) for deconfinement, T = 1.5T(c) and 3T(c). A two-pole ansatz for the quark spectral function is used to determine the bare quark mass and the momentum dependence of excitation spectra on large lattices of size up to 128(3) x 16. The dependence of the quark correlator on these parameters as well as the finite volume dependence of the excitation energies are analyzed in detail in order to examine the reliability of our analysis. Our results suggest the existence of quasiparticle peaks in the quark spectrum. We furthermore find evidence that the dispersion relation of the plasmino mode has a minimum at nonzero momentum even in the nonperturbative region near T-c. We also elaborate on the enhancement of the quark correlator near the chiral limit which is observed at T = 1: 5T(c) on about half of the gauge configurations. We attribute this to the presence of near zero-modes of the fermion matrix that are associated with nontrivial topology of the gauge configurations.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | HOT GAUGE-THEORIES; GLUON PLASMA; FINITE-TEMPERATURE; T-C; SPECTRAL PROPERTIES; LATTICE QCD; COLLABORATION; FLUCTUATIONS; EXCITATIONS; PERSPECTIVE; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Gunnar Bali |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 11 May 2020 05:05 |
| Last Modified: | 11 May 2020 05:05 |
| URI: | https://pred.uni-regensburg.de/id/eprint/18284 |
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