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Frankfurt am Main, Germany

Cassing W.,Justus Liebig University | Linnyk O.,Justus Liebig University | Steinert T.,Justus Liebig University | Ozvenchuk V.,Frankfurt Institute for Advanced Studies
Physical Review Letters | Year: 2013

We study the electric conductivity of hot QCD matter at various temperatures T within the off-shell parton-hadron-string dynamics transport approach for interacting partonic, hadronic or mixed systems in a finite box with periodic boundary conditions. The response of the strongly interacting system in equilibrium to an external electric field defines the electric conductivity σ0. We find a sizable temperature dependence of the ratio σ0/T well in line with calculations in a relaxation time approach for Tc Source


Strickland M.,Gettysburg College | Strickland M.,Frankfurt Institute for Advanced Studies
Physical Review Letters | Year: 2011

I compute the thermal suppression of the Υ(1s) and χb1 states in √sNN=2.76TeV Pb-Pb collisions. Using the suppression of each of these states I estimate the total RAA for the Υ(1s) state as a function of centrality, rapidity, and transverse momentum. I find less suppression of the χb1 state than would be traditionally assumed; however, my final results for the total Υ(1s) suppression are in good agreement with recent preliminary CMS data. © 2011 American Physical Society. Source


Sasaki C.,Frankfurt Institute for Advanced Studies | Sasaki C.,Wroclaw University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2014

The chiral thermodynamics of charmed mesons is formulated at a finite temperature within a (2+1+1)-flavored effective Lagrangian incorporating heavy quark symmetry. The charmed-meson mean fields act as an extra source which breaks the chiral symmetry explicitly. This leads to effective interactions between the light and heavy-light mesons, which intrinsically depend on temperature. Effective masses of the scalar and pseudoscalar charmed mesons tend to approach each other as temperature increases, so that the splitting between the chiral partners is reduced. These chiral splittings are shown to be less sensitive to the light quark flavors, attributed to the underlying heavy quark symmetry. Consequently, chiral symmetry restoration is more manifest for the strange charmed mesons than for the strange light mesons. The effective masses are also compared with the results in the one-loop chiral perturbation theory. A substantial difference is found at a relatively low temperature, T∼fπ. © 2014 American Physical Society. Source


Huovinen P.,Frankfurt Institute for Advanced Studies
International Journal of Modern Physics E | Year: 2013

Fluid dynamical description of elementary particle collisions has a long history dating back to the works of Landau and Fermi. Nevertheless, it is during the last 10-15 years when fluid dynamics has become the standard tool to describe the evolution of matter created in ultrarelativistic heavy-ion collisions. In this paper, I briefly describe the hydrodynamical models, what we have learned when analyzing the RHIC and LHC data using these models, and what the latest developments and challenges are. © 2013 World Scientific Publishing Company. Source


Sasaki C.,Frankfurt Institute for Advanced Studies | Redlich K.,Wroclaw University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2012

We derive the partition function for the SU(3) Yang-Mills theory in the presence of a uniform gluon field within the background field method. We show that the n-body gluon contributions in the partition function are characterized solely by the Polyakov loop. We express the effective action through characters of different representations of the color gauge group resulting in a form deduced in the strong-coupling expansion. A striking feature of this potential is that at low temperature gluons are physically disfavored, and therefore they do not yield the correct thermodynamics. We suggest a hybrid approach to Yang-Mills thermodynamics, combining the effective gluon potential with glueballs implemented as dilaton fields. © 2012 American Physical Society. Source

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