---
_id: '1590538'
abstract:
- lang: eng
text: We present an analysis of the quark spectral function above and below the
critical temperature for deconfinement performed at zero and nonzero momentum
in quenched lattice QCD using clover improved Wilson fermions in Landau gauge.
It is found that the temporal quark correlation function in the deconfined phase
near the critical temperature is well reproduced by a two-pole ansatz for the
spectral function. This indicates that excitation modes of the quark field have
small decay rates. The bare quark mass and momentum dependence of the spectral
function is analyzed with this ansatz. In the chiral limit we find that the quark
spectral function has two collective modes corresponding to the normal and plasmino
excitations in the high-temperature limit. Over a rather wide temperature range
in the deconfined phase the pole mass of these modes at zero momentum, which corresponds
to the thermal mass of the quark, is approximately proportional to temperature.
With increasing bare quark masses the plasmino mode gradually disappears, and
the spectral function is dominated by a single pole. We also discuss quasiparticle
properties of heavy quarks in the deconfined phase. In the confined phase, it
is found that the pole ansatz for the spectral function fails completely.
article_number: '056001'
article_type: original
arxiv: '1'
author:
- first_name: Frithjof
full_name: Karsch, Frithjof
id: '40326'
last_name: Karsch
- first_name: Masakiyo
full_name: Kitazawa, Masakiyo
last_name: Kitazawa
citation:
ama: 'Karsch F, Kitazawa M. Quark propagator at finite temperature and finite momentum
in quenched lattice QCD. *PHYSICAL REVIEW D*. 2009;80(5): 056001.'
angewandte-chemie: 'F. Karsch, and M. Kitazawa, “Quark propagator at finite temperature
and finite momentum in quenched lattice QCD”, *PHYSICAL REVIEW D*, **2009**,
*80*, : 056001.'
apa: Karsch, F., & Kitazawa, M. (2009). Quark propagator at finite temperature
and finite momentum in quenched lattice QCD. *PHYSICAL REVIEW D*, *80*(5),
056001. doi:10.1103/PhysRevD.80.056001
apa_indent: Karsch,
F., & Kitazawa, M. (2009). Quark propagator at finite temperature and finite
momentum in quenched lattice QCD. *PHYSICAL REVIEW D*, *80*(5),
056001. doi:10.1103/PhysRevD.80.056001

aps: ' F. Karsch and M. Kitazawa, Quark propagator at finite temperature and finite
momentum in quenched lattice QCD, PHYSICAL REVIEW D **80**, (2009).'
bio1: 'Karsch F, Kitazawa M (2009)

Quark propagator at finite temperature
and finite momentum in quenched lattice QCD.

PHYSICAL REVIEW D 80(5): 056001.'
chicago: 'Karsch,
Frithjof, and Kitazawa, Masakiyo. 2009. “Quark propagator at finite temperature
and finite momentum in quenched lattice QCD”. *PHYSICAL REVIEW D* 80 (5):
056001.

'
default: 'Karsch F, Kitazawa M (2009)

*PHYSICAL REVIEW D* 80(5): 056001.'
dgps: 'Karsch,
F. & Kitazawa, M. (2009). Quark propagator at finite temperature and finite
momentum in quenched lattice QCD. *PHYSICAL REVIEW D*, *80*(5):
056001. American Physical Society (APS). doi:10.1103/PhysRevD.80.056001.

'
frontiers: Karsch, F., and Kitazawa, M. (2009). Quark propagator at finite temperature
and finite momentum in quenched lattice QCD. *PHYSICAL REVIEW D* 80:056001.
harvard1: 'Karsch, F., & Kitazawa, M., 2009. Quark propagator at finite temperature
and finite momentum in quenched lattice QCD. *PHYSICAL REVIEW D*, 80(5):
056001.'
ieee: ' F. Karsch and M. Kitazawa, “Quark propagator at finite temperature and finite
momentum in quenched lattice QCD”, *PHYSICAL REVIEW D*, vol. 80, 2009,
: 056001.'
lncs: ' Karsch, F., Kitazawa, M.: Quark propagator at finite temperature and finite
momentum in quenched lattice QCD. PHYSICAL REVIEW D. 80, : 056001 (2009).'
mla: 'Karsch, Frithjof, and Kitazawa, Masakiyo. “Quark propagator at finite temperature
and finite momentum in quenched lattice QCD”. *PHYSICAL REVIEW D* 80.5
(2009): 056001.'
wels: 'Karsch, F.; Kitazawa, M. (2009): Quark propagator at finite temperature and
finite momentum in quenched lattice QCD *PHYSICAL REVIEW D*,80:(5):056001'
date_created: 2010-04-26T09:45:24Z
date_updated: 2018-07-24T12:58:40Z
department:
- _id: '23470456'
doi: 10.1103/PhysRevD.80.056001
edit_mode: expert
external_id:
arxiv:
- '0906.3941'
inspire:
- '823759'
isi:
- '000270384900108'
first_author: Karsch, Frithjof
inspire: '1'
intvolume: ' 80'
isi: '1'
issue: '5'
language:
- iso: eng
publication: PHYSICAL REVIEW D
publication_identifier:
eissn:
- 1550-2368
issn:
- 1550-7998
publication_status: published
publisher: American Physical Society (APS)
quality_controlled: '1'
status: public
title: Quark propagator at finite temperature and finite momentum in quenched lattice
QCD
type: journal_article
volume: '80'
year: '2009'
...