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

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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...

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Bibliographic Details
Main Authors: Ilgenfritz, Ernst-Michael (Author) , Pawlowski, Jan M. (Author) , Rothkopf, Alexander (Author)
Format: Article (Journal)
Language:English
Published: 14 February 2018
In: The European physical journal. C, Particles and fields
Year: 2018, Volume: 78, Issue: 2
ISSN:1434-6052
DOI:10.1140/epjc/s10052-018-5593-7
Online Access:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1140/epjc/s10052-018-5593-7
Verlag, kostenfrei, Volltext: https://link.springer.com/article/10.1140/epjc/s10052-018-5593-7
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Author Notes:Ernst-Michael Ilgenfritz, Jan M. Pawlowski, Alexander Rothkopf, Anton Trunin
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Summary: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.
Item Description:Im Titel ist das f tiefgestellt
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Physical Description:Online Resource
ISSN:1434-6052
DOI:10.1140/epjc/s10052-018-5593-7

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