Vector spectral functions and transport properties in quenched QCD

Dec 18, 2014
7 pages
Published in:
  • PoS LATTICE2014 (2015) 216
Contribution to:
  • Published: May 20, 2015 by SISSA
e-Print:
Report number:
  • BI-TP-2014-27

Citations per year

201520172019202120239210
Abstract: (arXiv)
We present new results on the reconstruction of mesonic spectral functions for three temperatures 1.1Tc1.1T_c, 1.2Tc1.2T_c and 1.4Tc1.4T_c in quenched QCD. Making use of non-perturbatively improved clover Wilson valence quarks allows for a clean extrapolation of correlator data to the continuum limit. For the case of vanishing momentum the spectral function is obtained by fitting the data to a well motivated ansatz, using the full covariance matrix of the continuum extrapolated data in the fit. We found that vector correlation function is almost temperature independent in the current temperature window. The electrical conductivity of the hot medium, related to the origin of the vector spectral function at zero momentum, is computed from the resulting parameters at all three temperatures, leading to an estimate of 0.2Cemσ/T0.4Cem0.2C_{em}\lesssim \sigma/T\lesssim0.4C_{em}. The dilepton rates resulting from the obtained spectral functions show no significant temperature dependence.
Note:
  • 7 pages, 5 figures, PoS LATTICE 2014
  • spectral representation: vector
  • quantum chromodynamics: quenching
  • correlation function: vector
  • quark: valence
  • temperature dependence
  • transport theory
  • continuum limit
  • conductivity: electric
  • dilepton
  • fermion: clover