Finite-temperature gluon spectral functions from Nf=2+1+1 lattice QCD

• Verfasst von: Ilgenfritz, Ernst-Michael [VerfasserIn]
• Verfasst von: Pawlowski, Jan M. [VerfasserIn]
• Verfasst von: Rothkopf, Alexander [VerfasserIn]
• Titel: Finite-temperature gluon spectral functions from Nf=2+1+1 lattice QCD
• Verf.angabe: Ernst-Michael Ilgenfritz, Jan M. Pawlowski, Alexander Rothkopf, Anton Trunin
• E-Jahr: 2018
• Jahr: 14 February 2018
• Umfang: 21 S.
• Fussnoten: Im Titel ist das f tiefgestellt ; Gesehen am 16.12.2020
• Titel Quelle: Enthalten in: The European physical journal / C
• Ort Quelle: Berlin : Springer, 1998
• Jahr Quelle: 2018
• Band/Heft Quelle: 78(2018,2) Artikel-Nummer 127, 21 Seiten
• ISSN Quelle: 1434-6052
• DOI: doi:10.1140/epjc/s10052-018-5593-7
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1570629625

Abstract

We investigate gluon correlation functions and spectral functions at finite temperature in Landau gauge on lattice QCD ensembles with Nf=2+1+1Nf=2+1+1N_f=2+1+1 dynamical twisted-mass quarks flavors, generated by the tmfT collaboration. They cover a temperature range from 0.8≤T/TC≤40.8≤T/TC≤40.8\le T/T_C\le 4 using the fixed-scale approach. Our study of spectral properties is based on a novel Bayesian approach for the extraction of non-positive-definite spectral functions. For each binned spatial momentum we take into account the gluon correlation functions at all available discrete imaginary frequencies. Clear indications for the existence of a well defined quasi-particle peak are obtained. Due to a relatively small number of imaginary frequencies available, we focus on the momentum and temperature dependence of the position of this spectral feature. The corresponding dispersion relation reveals different in-medium masses for longitudinal and transversal gluons at high temperatures, qualitatively consistent with weak coupling expectations.