### Conveners

#### Parallel Session 3.1: QCD at High Temperature

- Claudia Ratti (University of Houston)

Transport coefficients of QCD like the shear viscosity $\eta$ and the diffusion of baryon number $D$ have been determined at leading order in perturbation theory by Arnold, Moore and Yaffe (AMY). I will show how these transport coefficients are sensitive to $O(g)$ corrections arising from interactions with soft gluons. These NLO effects enter as corrections to the transverse momentum...

We develop an effective field theory for QCD at finite temperature which takes into account the global symmetries of the problem, including the fact that Lorentz invariance is broken. We discuss regularization and fixing of parameters in the theory. Some of the predictions of the theory are presented, for example the curvature of the critical line. The degree of agreement between the...

We want to study thermodynamical observables at finite density. Since direct lattice simulations at finite muB are hindered by the sign problem an efficient way to study the QCD phase diagram at small finite density is to extrapolate observables from imaginary chemical potential. In this talk we present results on several observables for the equation of state. The observables are calculated...

Many precision measurements of quarkonium suppression at the LHC, e.g. the nuclear modification factor R_AA of J/Psi, are well described by a multitude of different models [1]. Thus pinpointing the underlying physics is difficult and first principles guidance is needed. In-medium spectral properties, e.g. mass shifts or the broadening of states can help us to understand quarkonium production...

The QCD Equation of State (EoS) is fundamental for our understanding of the properties

of strong-interaction matter at non-zero temperature and density. In view of the

upcoming Beam Energy Scan II program at RHIC, it is important to gain control

over the EoS in the entire range of chemical potentials ($\mu_B$) accessible at

RHIC, $0\le \mu_B/T \le 3$. This will provide crucial input for...

We study the thermodynamics of the quark gluon plasma with

lattice simulations in the continuum limit up to 1 GeV

temperature where we show that a perturbative description

already applies. We calculate the effect of the presence

of charm quark in the equation of state and also describe

the topological features of quantum chromodynamics.

The talk is based on the paper 1606.07494 (Nature, in press).