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Title: Zero Mode in a Strongly Coupled Quark Gluon Plasma

Abstract

In connection with massless two-flavor QCD, we analyze the chiral symmetry restoring phase transition using three distinct gluon-quark vertices and two different assumptions about the long-range part of the quark-quark interaction. In each case, we solve the gap equation, locate the transition temperature T-c, and use the maximum entropy method to extract the dressed-quark spectral function at T>T-c. Our best estimate for the chiral transition temperature is T-c=147 +/- 8 MeV, and the deconfinement transition is coincident. For temperatures markedly above Tc, we find a spectral density that is consistent with those produced using a hard thermal loop expansion, exhibiting both a normal and plasmino mode. On a domain T is an element of[T-c, T-s] , with T-s approximate to 1.5T(c), however, with each of the six kernels we considered, the spectral function contains a significant additional feature. Namely, it displays a third peak, associated with a zero mode, which is essentially nonperturbative in origin and dominates the spectral function at T=Tc. We suggest that the existence of this mode is a signal for the formation of a strongly coupled quark-gluon plasma and that this strongly interacting state of matter is likely a distinctive feature of the QCD phase transition.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Nuclear Physics; National Natural Science Foundation of China (NNSFC); Helmholtz Association of German Research Centres
OSTI Identifier:
1530873
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 89; Journal Issue: 7
Country of Publication:
United States
Language:
English

Citation Formats

Gao, Fei, Qin, Si-xue, Liu, Yu-xin, Roberts, Craig D., and Schmidt, Sebastian M. Zero Mode in a Strongly Coupled Quark Gluon Plasma. United States: N. p., 2014. Web. doi:10.1103/PhysRevD.89.076009.
Gao, Fei, Qin, Si-xue, Liu, Yu-xin, Roberts, Craig D., & Schmidt, Sebastian M. Zero Mode in a Strongly Coupled Quark Gluon Plasma. United States. doi:10.1103/PhysRevD.89.076009.
Gao, Fei, Qin, Si-xue, Liu, Yu-xin, Roberts, Craig D., and Schmidt, Sebastian M. Wed . "Zero Mode in a Strongly Coupled Quark Gluon Plasma". United States. doi:10.1103/PhysRevD.89.076009.
@article{osti_1530873,
title = {Zero Mode in a Strongly Coupled Quark Gluon Plasma},
author = {Gao, Fei and Qin, Si-xue and Liu, Yu-xin and Roberts, Craig D. and Schmidt, Sebastian M.},
abstractNote = {In connection with massless two-flavor QCD, we analyze the chiral symmetry restoring phase transition using three distinct gluon-quark vertices and two different assumptions about the long-range part of the quark-quark interaction. In each case, we solve the gap equation, locate the transition temperature T-c, and use the maximum entropy method to extract the dressed-quark spectral function at T>T-c. Our best estimate for the chiral transition temperature is T-c=147 +/- 8 MeV, and the deconfinement transition is coincident. For temperatures markedly above Tc, we find a spectral density that is consistent with those produced using a hard thermal loop expansion, exhibiting both a normal and plasmino mode. On a domain T is an element of[T-c, T-s] , with T-s approximate to 1.5T(c), however, with each of the six kernels we considered, the spectral function contains a significant additional feature. Namely, it displays a third peak, associated with a zero mode, which is essentially nonperturbative in origin and dominates the spectral function at T=Tc. We suggest that the existence of this mode is a signal for the formation of a strongly coupled quark-gluon plasma and that this strongly interacting state of matter is likely a distinctive feature of the QCD phase transition.},
doi = {10.1103/PhysRevD.89.076009},
journal = {Physical Review. D, Particles Fields},
number = 7,
volume = 89,
place = {United States},
year = {2014},
month = {4}
}

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