2011/06/29 by Yukinao Akamatsu, Hideki Hamagaki, Tetsuo Hatsuda +1 · 1 citation
Physics and Astronomy · #nucl-th #hep-ph #nucl-ex
paper · pdf · doi:10.1088/0954-3899/38/12/124184
To appear in the conference proceedings for Quark Matter 2011, May 23 - May 28, Annecy, France
arxiv created 2011/06/29 · arxiv updated 2015/05/28
We propose a novel relation between the low-mass enhancement of dielectrons observed at PHENIX and transport coefficients of QGP such as the charge diffusion constant D and the relaxation time τ\rm J. We parameterize the transport peak in the spectral function using the second-order relativistic dissipative hydrodynamics by Israel and Stewart. Combining the spectral function and the full (3+1)-dimensional hydrodynamical evolution with the lattice EoS, theoretical dielectron spectra and the experimental data are compared. Detailed analysis suggests that the low-mass dilepton enhancement originates mainly from the high-temperature QGP phase where there is a large electric charge fluctuation as obtained from lattice QCD simulations.