Speaker
Mr
Florian Meyer
(Bielefeld University, Germany)
Description
We present new results on the reconstruction of mesonic continuum spectral
functions for three temperatures between 1.1Tc and 1.5Tc in quenched QCD. Making use of
non-perturbatively improved clover Wilson valence quarks allows for a clean
extrapolation of measured correlator data to the continuum. We found that the vector
correlation function is almost temperature independent in the current
temperature window. For the case of
vanishing momentum the vector spectral function is obtained by fitting the data to
a well motivated ansatz. The electrical conductivity of the hot medium, related to the slope of the
vector spectral function, is computed from the resulting
parameters leading to a temperature independent estimate for all three temperatures.
The dilepton rates resulting from
the obtained spectral functions are compared to a perturbative expression, obtained
by combining the results of different computations in different frequency regimes.
Our results qualitatively yield a larger rate in the intermediate frequency regime,
and also show no significant temperature dependence.
The continuum extrapolated transversally and longitudinally polarized correlation functions at
different momenta are compared to the corresponding perturbative expressions.
Primary author
Mr
Florian Meyer
(Bielefeld University, Germany)
Co-authors
Prof.
Heng-Tong DING
(Central China Normal University)
Olaf Kaczmarek
(Bielefeld University, Germany)
