Thermal dilepton rate and electrical conductivity: An analysis of vector current correlation functions in quenched lattice QCD
By H. Ding, A. Francis, O. Kaczmarek, F. Karsch, E. Laermann, W. Soeldner. 2010
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We calculate the vector current correlation function for light valence quarks in the deconfined phase of QCD. The calculations have been performed in quenched lattice QCD at T ≃ 1.45Tc for four values of the lattice cut-off on lattices up to size 128 3 × 48. This allows to perform a continuum extrapolation of the correlation function in the Euclidean time interval 0.2 ≤ τT ≤ 0.5, which extends to the largest temporal separations possible at finite temperature, to better than 1% accuracy. In this interval, at the value of the temperature investigated, we find that the vector correlation function never deviates from the free correlator for massless quarks by more than 9%. We also determine the first two non-vanishing thermal moments of the vector meson spectral function. The second thermal moment deviates by less than 7% from the free value. With these constraints, we then proceed to extract information on the spectral representation of the vector correlator and discuss resulting consequences for the electrical conductivity and the thermal dilepton rate in the plasma phase.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/8c1c6e3294b0a993929984b85a9637a735a7ef33
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In Nuclear and High Energy Physics
Citations in the corpus
- Particle Production in Strong Electromagnetic Fields in Relativistic Heavy-Ion Collisions (2013, background): “Evidently, magnetic field rapidly decreases as a power of time, so that after first 3 fm it drops by more than three orders of magnitude.”
- Transport properties of the quark-gluon plasma (2011, methodology): “ interval [184], which has a stabilizing effect. An example of a spectral function in the vector channel of quenched QCD obtained from a MEM analysis is reported in Fig. (34). See the recent reference [145] for further examples. The choice of non-quadratic regulator (316) has an information-theoretic”
- Electrical conductivity and charge diffusion in thermal QCD from the lattice (2014, background): “[62], where a continuum extrapolated lattice QCD calculation was performed (see, however, Ref.”