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Bayesian analysis of quark spectral properties from the Dyson-Schwinger equation

Christian S. Fischer, Jan M. Pawlowski, Alexander Rothkopf, and Christian A. Welzbacher

We report results on the quark spectral function in the Landau gauge at finite temperature determined from its Dyson-Schwinger equation. Compared to earlier quenched results this study encompasses unquenched $N_f=2+1$ fermion flavors in the medium. For the reconstruction of real-time spectra we depl... Full description

Main Author: Fischer, Christian S.
Contributors: Pawlowski, Jan M. | Author
Rothkopf, Alexander | Author
Published: 2017
Contained in: De.arxiv.org [S.l.] : Arxiv.org, 1991 (2017) Artikel-Nummer 1705.03207, 18 Seiten
Journal Title: De.arxiv.org
Fulltext access: Fulltext access (direct link - free access)
Availability is being checked...
Links: Volltext (arxiv.org)
Keywords: High Energy Physics - Phenomenology
Nuclear Theory
Language: English
Notes: Gesehen am 30.11.2017
Physical Description: 18
PPN (Catalogue-ID): 1565768825
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520 |a We report results on the quark spectral function in the Landau gauge at finite temperature determined from its Dyson-Schwinger equation. Compared to earlier quenched results this study encompasses unquenched $N_f=2+1$ fermion flavors in the medium. For the reconstruction of real-time spectra we deploy a recent Bayesian approach (BR method) and develop a new prior in order to better assess the inherent systematic uncertainties. We identify the quark quasi-particle spectrum and analyze the (non-)appearance of zero modes at or around the pseudo-critical temperature. In both, the fully unquenched system and a simpler truncation using a model for the gluon propagator we observe a characteristic three-peak structure at zero three-momentum. The temperature dependence of these structures in case of the gluon propagator model is different than observed in previous studies. For the back-coupled and unquenched case we find interesting modifications at and around the pseudo-critical transition temperature. 
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