Finite-temperature gluon spectral functions from Nf=2+1+1 lattice QCD
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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| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
14 February 2018
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| In: |
The European physical journal. C, Particles and fields
Year: 2018, Jahrgang: 78, Heft: 2 |
| ISSN: | 1434-6052 |
| DOI: | 10.1140/epjc/s10052-018-5593-7 |
| Online-Zugang: | 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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| Verfasserangaben: | Ernst-Michael Ilgenfritz, Jan M. Pawlowski, Alexander Rothkopf, Anton Trunin |
MARC
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| 520 | |a 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. | ||
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