$Z_3$ meta-stable states in PNJL model

**heavy**-

**ion**collisions, the likely scenario for the decay of the meta-stable states is via spinodal decomposition.

6/10 relevant

arXiv

What attracts to attractors?

**ions**of Bjorken-expanding systems become insensitive to aspects of their init

**ial**conditions is of great importance to the phenomenology of

**heavy**-

**ion**

**collisions**. Expand abstract.

**heavy**-

**ion**

**collisions**. Here we study 1+1D and phenomenologically relevant 3+1D systems in which initial conditions decay to a universal attractor solution. We show that this early-time decay is governed by a power-law, in marked contrast to the exponential decay to attractor solutions at late times. Therefore, the physical mechanisms of hydrodynamization operational at late times do not drive the approach to the attractor at early times, and the early-time attractor is reached prior to hydrodynamization. Hydrodynamization is subsequently achieved as the attractor approaches its fluid-dynamic approximation at late times.

6/10 relevant

arXiv

Strangeness neutrality and the QCD phase diagram

**ions**on the freeze-out conditions of

**heavy**-

**ion**

**collisions**by studying their dependence on temperature, baryon- and strangeness chem

**ical**potential. Expand abstract.

**heavy**-

**ion**

**collisions**do not carry strangeness, the global net strangeness of the detected hadrons has to vanish. We show that there is an intimate relation between strangeness neutrality and baryon-strangeness correlations. In the context of

**heavy**-

**ion**collisions, the former is a consequence of quark number conservation of the strong interactions while the latter are sensitive probes of the character of QCD matter. We investigate the sensitivity of baryon-strangeness correlations on the freeze-out conditions of

**heavy**-

**ion**

**collisions**by studying their dependence on temperature, baryon- and strangeness chemical potential. The impact of strangeness neutrality on the QCD equation of state at finite chemical potentials will also be discussed. We model the low-energy sector of QCD by an effective Polyakov loop enhanced quark-meson model with 2+1 dynamical quark flavors and use the functional renormalization group to account for the non-perturbative quantum fluctuations of hadrons.

10/10 relevant

arXiv

Testing product**ion** scenarios for (anti-)(hyper-)nuclei with
multiplicity-dependent measurements at the LHC

**collisions**. In particular, nuclei and hyper-nuclei are special objects with respect to non-composite hadrons (such as pions, kaons, protons, etc.), because their size is comparable to a fraction or the whole system created in the

**collision**. Their formation is typically described within the framework of coalescence and thermal-statistical production models. In order to distinguish between the two production scenarios, we propose to measure the coalescence parameter B$_{A}$ for different anti- and hyper-nuclei (that differ by mass, size and internal wave-function) as a function of the size of the particle emitting source. The latter can be controlled by performing systematic measurements of light (anti-)(hyper-)nuclei in different

**collision**systems (pp, pA, AA) and as a function of the multiplicity of particles created in the

**collision**. While it is often argued that the coalescence and the thermal model approach give very similar predictions for the production of light nuclei in

**heavy**-

**ion**collisions, our study shows that large differences can be expected for hyper-nuclei with extended wave-functions, as the hyper-triton. We compare the model predictions with data from the ALICE experiment and we discuss perspectives for future measurements with the upgraded detectors during the High-Luminosity LHC phase in the next decade.

7/10 relevant

arXiv

Influence of Backside Energy Leakages from Hadron**ic** Calorimeters on
Fluctu**ation** Measures in Relativistic **Heavy**-**Ion** **Collisions**

**ion**has a dramat

**ic**impact on multiplicity scal

**ed**variance. Expand abstract.

**heavy**systems such as Ar + Sc are much less prone to the effect.

10/10 relevant

arXiv

Matter And Gravit**ation** In **Collisions** of **heavy** **ions** and neutron stars:
equat**ion** of state

**ed**extremes of thermodynamics do match, to within 20\%, the values of densities and temperatures which we find in relativist

**ic**hydrodynamics and transport theory of

**heavy**

**ion**

**collisions**at the existing laboratories, if though at quite different... Expand abstract.

**heavy**

**ion**

**collisions**at the existing laboratories, if though at quite different rapidity windows, impact parameters and bombarding energies of the

**heavy**nuclear systems. We demonstrate how one unified equation of state can be constructed and used for both neutron star physics and hot QCD matter excited at laboratory facilities. The similarity in underlying QCD physics allows the gravitational wave signals from future advanced LIGO and Virgo events to be combined with the analysis of high multiplicity fluctuations and flow measurements in

**heavy**

**ion**detectors in the lab to pin down the EoS and the phase structure of dense matter.

10/10 relevant

arXiv

Highly occupi**ed** gauge theories in 2+1 dimensions: self-similar attractor

**heavy**-

**ion**collisions, we perform classical-statistical simulations of SU(2) gauge theory in 2+1 dimensional space-time both with and without a scalar field in the adjoint representation. We show that irrespective of the details of the initial condition, the far-from-equilibrium evolution of these highly occupied systems approaches a unique universal attractor at high momenta that is the same for the gauge and scalar sectors. We extract the scaling exponents and the form of the distribution function close to this non-thermal fixed point. We find that the dynamics are governed by an energy cascade to higher momenta with scaling exponents $\alpha = 3\beta$ and $\beta = -1/5$. We argue that these values can be obtained from parametric estimates within kinetic theory indicating the dominance of small momentum transfer in the scattering processes. We also extract the Debye mass non-perturbatively from a longitudinally polarized correlator and observe an IR enhancement of the scalar correlation function for low momenta below the Debye mass.

7/10 relevant

arXiv

Measurement of flow harmonics correlat**ions** with mean transverse momentum
in lead-lead and proton-lead **collisions** at $\sqrt{s_{NN}}=5.02$ TeV with the
ATLAS detector

**heavy**-

**ion**collisions, the ATLAS experiment at the LHC measures a correlation between the mean transverse momentum and the magnitudes of the flow harmonics. The analysis uses data samples of lead-lead and proton-lead

**collisions**obtained at the centre-of-mass energy per nucleon pair of 5.02 TeV, corresponding to total integrated luminosities of $22 ~\mu b^{-1}$ and $28~nb^{-1}$, respectively. The measurement is performed using a modified Pearson correlation coefficient with the charged-particle tracks on an event-by-event basis. The modified Pearson correlation coefficients for the $2^{nd}$-, 3$^{rd}$-, and 4$^{th}$-order harmonics are measured as a function of event centrality quantified as the number of charged particles or the number of nucleons participating in the

**collision**. The measurements are performed for several intervals of the charged-particle transverse momentum. The correlation coefficients for all studied harmonics exhibit a strong centrality evolution in the lead-lead collisions, which only weakly depends on the charged-particle momentum range. In the proton-lead collisions, the modified Pearson correlation coefficient measured for the second harmonics shows only weak centrality dependence. The data is qualitatively described by the predictions based on the hydrodynamical model.

9/10 relevant

arXiv

Deciphering the $z_g$ distribution in ultrarelativist**ic** **heavy** **ion** **collisions**

10/10 relevant

arXiv

Parton-Hadron-Quantum-Molecular Dynamics (PHQMD) -- A Novel Microscopic
N-Body Transport Approach for **Heavy**-**Ion** **Collisions**, Dynam**ical** Cluster
Form**ation** and Hypernuclei Production

**heavy**-

**ion**

**collisions**is presently under active experimental and theoretical investigation. Since clusters are weekly bound objects, their production is very sensitive to the dynamical evolution of the system and its interactions. The theoretical description of cluster formation is related to the n-body problem. Here we present the novel n-body dynamical transport approach PHQMD (Parton-Hadron-Quantum-Molecular Dynamics) which is designed to provide a microscopic description of nuclear cluster and hypernucleus formation as well as of general particle production in

**heavy**-

**ion**reactions at relativistic energies. In difference to the coalescence or statistical models, often used for the cluster formation, in PHQMD clusters are formed dynamically due to the interactions between baryons described on a basis of Quantum Molecular Dynamics (QMD)which allows to propagate the n-body Wigner density and n-body correlations in phase-space, essential for the cluster formation. The clusters are identified by the MST (Minimum Spanning Tree) or the SACA ('Simulated Annealing Cluster Algorithm') algorithm which finds the most bound configuration of nucleons and clusters.

**Collisions**among hadrons as well as Quark-Gluon-Plasma formation and parton dynamics in PHQMD are treated in the same way as in the established PHSD (Parton-Hadron-String Dynamics)transport approach. In order to verify our approach with respect to the general dynamics we present here the first PHQMD results for general 'bulk' observables such as rapidity distributions and transverse mass spectra for hadrons ($\pi, K, \bar K, p, \bar p, \Lambda, \bar \Lambda$) from SIS to RHIC energies. We find a good description of the 'bulk' dynamics which allows us to proceed with the results on cluster production, including hypernuclei.

10/10 relevant

arXiv