Spectral Properties of Quarks at Finite Temperature in Lattice QCD
Abstract
We analyze the quark spectral function above and below the critical temperature for deconfinement and at finite momentum in quenched lattice QCD. It is found that the temporal quark correlation function in the deconfined phase near the critical temperature is well reproduced by a twopole ansatz for the spectral function. The bare quark mass and momentum dependences of the spectral function are analyzed with this ansatz. In the chiral limit we find that even near the critical temperature the quark spectral function has two collective modes corresponding to the normal and plasmino excitations in the high temperature (T) limit. The pole mass of these modes at zero momentum, which should be identified to be the thermal mass of the quark, is approximately proportional to T in a rather wide range of T in the deconfined phase.
 Publication:

Nuclear Physics A
 Pub Date:
 November 2009
 DOI:
 10.1016/j.nuclphysa.2009.09.024
 arXiv:
 arXiv:0908.3079
 Bibcode:
 2009NuPhA.830..223K
 Keywords:

 High Energy Physics  Lattice
 EPrint:
 4 pages, 2 figures  To appear in the conference proceedings for Quark Matter 2009, March 30  April 4, Knoxville, Tennessee