Conveners
PA-Bulk matter phenomena, QCD phase diagram, and Critical point
- Olga Soloveva (Goethe University Frankfurt)
PA-Bulk matter phenomena, QCD phase diagram, and Critical point
- Mesut Arslandok (Yale University (US))
PA-Bulk matter phenomena, QCD phase diagram, and Critical point
- Min Jung Kweon (Inha University (KR))
PA-Bulk matter phenomena, QCD phase diagram, and Critical point
- Beomkyu Kim (Sungkyunkwan University)
PA-Bulk matter phenomena, QCD phase diagram, and Critical point
- Zi-Wei Lin (East Carolina University)
PA-Bulk matter phenomena, QCD phase diagram, and Critical point
- Vytautas Vislavicius (Lund University (SE))
PA-Bulk matter phenomena, QCD phase diagram, and Critical point
- Philipp Gubler (JAEA)
PA-Bulk matter phenomena, QCD phase diagram, and Critical point
- Aleksas Mazeliauskas (CERN)
The second-order Fourier coefficients ($v_{2}$) of $\Upsilon$(1S) and J/$\psi$ mesons in high-multiplicity pPb collisions is studied using data collected by the CMS experiment at a nucleon-nucleon center-of-mass energy 8.16 TeV. The dimuons used to reconstruct the quarkonium states are coupled with charged hadrons using the long-range two-particle correlation technique. The measurement of the...
By using gravity/gauge correspondence, we employ an Einstein-Maxwell-Dilaton model to compute the equilibrium and out-of-equilibrium properties of a hot and baryon rich strongly coupled quark-gluon plasma. The family of 5-dimensional holographic black holes, which are constrained to mimic the lattice QCD equation of state at zero density, is used to investigate the temperature and baryon...
To study the bulk properties of the quark-gluon-plasma (QGP) produced at the beam energy scan (BES) energies at the Relativistic Heavy Ion Collider (RHIC), we extend the (3+1)-dimensional viscous hydrodynamics CLVisc [1,2,3] to include net baryon number conservation and Israel-Stewart-like equation for baryon diffusion with the NEOS-BQS equation of state, fluctuating initial conditions from...
The production of quarkonia in hadronic collisions provides a unique testing ground for understanding quantum chromodynamics (QCD) since it involves both the perturbative and non-perturbative regimes of this theory. As the quarkonia formation is not yet fully understood, a variety of new experimental data serve as new insights and help to constrain the models. Additionally to the inclusive...
Intriguing experimental results on two-particle azimuthal correlations in ultra-peripheral Pb+Pb collisions (UPCs) have been measured at the Large Hadron Collider (LHC) [1]. In this talk, I will present the first full (3+1)D dynamical simulations to study collective behavior in UPC events at RHIC and the LHC with the 3DGlauber+MUSIC+UrQMD framework [2, 3]. First, extrapolating from asymmetric...
Angular correlations present in dijet photoproduction are studied, for the first time, using ultraperipheral lead-lead collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The second moment of the angular distribution, $\langle \cos(2\Phi) \rangle$, where $\Phi$ is the angle between the vector sum $\vec{Q}_\mathrm{T}$ and the vector difference $\vec{P}_\mathrm{T}$ of the...
In this contribution, the similarity between small and large collision systems will be explored using the underlying event (UE) charged particle density, $N_{T}$, and the self-normalized observable based on transverse region multiplicity, $R_{T}$. A study of KNO-like scaling properties of the $N_{T}$ distributions in pp collisions at $\sqrt{s}$ = 2.76, 5.02, 7 and 13 TeV will be presented....
We introduce a novel freeze-out procedure connecting the hydrodynamic evolution of a droplet of quark-gluon plasma (QGP) that has, as it expanded and cooled, passed close to a critical point on the QCD phase diagram with the subsequent kinetic description in terms of observable hadrons. The procedure converts out of equilibrium critical fluctuations described by extended hydrodynamics, known...
Relativistic heavy-ion collisions can study properties of nuclear matter in high-energy experiments like the STAR experiment. One of the methods to learn about bulk matter is the femtoscopy technique, which relies on information carried by the particles produced during the collisions. The emission source parameters, like space-time characteristics, are provided using femtoscopic quantities....
Higher-order cumulants of net-proton distributions are sensitive to the details of the phase structure of the QCD phase diagram. Lattice QCD and QCD-based model calculations indicate that the signs of sixth and eighth order cumulants have different combinations in the hadronic phase, partonic phase, and near the transition temperature.
We report the first measurements of seventh and eighth...
In heavy-ion collisions, the observation of the global and local polarization of hyperons has revealed the existence of large vorticities perpendicular to reaction plane due to systems’s orbital angular momentum and along beam direction due to collective velocity field, respectively. With the high-statistics data from isobar collisions of Ru+Ru and Zr+Zr at $\sqrt{s_{NN}}$ = 200 GeV collected...
Particle flow measurements, which provide evidence of the QGP medium, are a powerful tool to study the QGP evolution in heavy-ion collisions. Using the two-particle correlation technique, LHCb has observed the ridge structure due to particle flow, in the forward pseudorapidity range $2<\eta<5$ alongside the leading jet peak in long-range correlations ($|\eta|>2$). This talk will detail the...
Elliptic flow coefficient, $v_2$, is sensitive to the dynamics at the early stages of the system evolution in heavy-ion collisions and equation of state of the medium.
Triangular flow $v_3$ is particularly sensitive to the initial geometry fluctuations.
The hadronic interaction cross sections of multi-strange hadrons and $\phi$ mesons are expected to be small. Hence, anisotropic flow of...
Global spin alignment is a preferential alignment of a particle’s spin along the orbital an6 gular momentum produced in heavy-ion collisions. The global spin alignment of vector mesons ($J^P$ = $1^−$) $\phi$ and $K^{\ast 0}$ may be sensitive to the vorticity and hadronization mechanism in the medium. The second phase of RHIC Beam Energy Scan (BES-II) program provides new and higher statistics...
Strange and multi-strange hadrons have a small hadronic cross-section compared to light hadrons, making them an excellent probe for understanding the initial stages of relativistic heavy-ion collisions and QCD dynamics. Isobar collisions, $^{96}_{44}$Ru+$^{96}_{44}$Ru and $^{96}_{40}$Zr+$^{96}_{40}$Zr, at $\sqrt{s_{\mathrm {NN}}}$ = 200 GeV have been performed at RHIC. These collisions are...
The interplay of the chiral anomaly and the strong magnetic field (~10$^{15}$ T) created in the off-central heavy-ion collisions could give rise to a collective excitation in the quark-gluon plasma called the Chiral Magnetic Wave (CMW), which can be experimentally sought by the charge asymmetry ($A_{\rm ch}$) dependence of elliptic flow $v_2$ of positively and negatively charged hadrons....
We discuss the QCD phase diagram in the presence of strong magnetic fields. It is known that the chiral symmetry is inevitably broken via the celebrated mechanism of the "magnetic catalysis"; the quarks confined in the cyclotron orbits are forced to form the chiral condensate due to the effective low dimensionality. In addition, we take into account the existence of heavy quarks as impurities...
Including the finite nuclear thickness has been shown to significantly affect the calculated energy density $\epsilon(t)$ [1] from the primary collisions of heavy ions at moderate or low energies. As a result, the peak density reached during the collisions can be much lower than the predicted initial density from the Bjorken formula. Recently we have extended the model to also calculate the...
The polarization of the $\Lambda$ hyperon has become an important probe of the Quark-Gluon Plasma produced in relativistic heavy-ion collisions. Recently, it has been found that polarization receives a substantial contribution from a local equilibrium term proportional to the symmetric derivative of the four-temperature vector, the thermal shear tensor. We show that, at very high energies,...
In this talk we present a resummation of the QCD equation of state from
lattice simulations at imaginary chemical potentials. We utilize a
generalization of the scheme introduced in 2102.06660, moving to the case of
non-zero strangeness chemical potential. We present continuum extrapolated
results for thermodynamic observables in the temperature range
130 MeV $\le T \le$ 280 MeV, for...
The search for experimental signatures of the critical point (CP) of strongly interacting matter is one of the main objectives of the NA61/SHINE experiment at CERN SPS. One such candidate observable is local fluctuations of the proton density in transverse space, constituting an order parameter of the chiral phase transition, and expected to scale according to a universal power-law in the...
The quark susceptibilities are a very useful tool to understand the nature
of the degrees of freedom in the vicinity of the QCD phase transition while Heavy-Quarks (HQs) transport coefficients give us information on their thermalization time in the Quark-Gluon Plasma (QGP). Recently, new lattice results for the equation of state of QCD with $2+1+1$ dynamical flavors have become available....
We present equilibrium as well as out-of-equilibrium properties of the strongly interacting QGP medium under extreme conditions of high temperature $T$ and high baryon densities or baryon chemical potentials $\mu_B$ within a kinetic approach. We will explore first the thermodynamic and transport properties of the QGP close to equilibrium in the framework of effective models with $N_f=3$ active...
Motivated by strangeness enhancement implying the possible QGP (quark-gluon plasma) formation in small colliding systems, we extend the hydro-based framework incorporating non-equilibrated components which play an essential role in small colliding systems. It has been widely accepted that relativistic hydrodynamics well describes the dynamics of the QGP at low $p_{\mathrm{T}}$ regimes in large...
A major focus of recent experiments in heavy-ion collisions is to reveal rich phase structure in high baryon density matter: the first-order chiral transition line with the QCD critical point, CSC phase transition and so on. Such experiments include the beam-energy scan program at RHIC, and HADES and NA61/SHINE collaborations as well as those to be performed in future experimental facilities...
We analyze the behavior of cumulants of conserved charges in a subvolume of a thermal system with exact global conservation laws by extending [1] a recently developed [2] subensemble acceptance method (SAM) to multiple conserved charges. Explicit expressions for all diagonal and off-diagonal cumulants up to sixth order that relate them to the grand canonical susceptibilities are obtained. The...
This talk presents new measurements of longitudinal flow decorrelations in 5.02 TeV and 13 TeV pp collisions and 5.44 TeV Xe+Xe collisions with the ATLAS detector. The measurements are performed using the two-particle correlation method with charged-particle tracks within |eta| < 2.5 and clusters within 4.0 < |eta| < 4.9. Due to the larger influence of non-flow effects in small collision...
First experimental results on the third-order cumulants of net-proton fluctuations, as well as second-order cumulants of net-pion and net-kaon fluctuations, in Pb-Pb collisions recorded by the ALICE detector at the CERN LHC are presented. Resonance contributions are shown to pose the main challenge in the study of fluctuations in net-electric charge and net-strangeness. The results on...
Two-particle charge-dependent correlations (balance functions) are sensitive to the production and transport of conserved quantum numbers in the medium created in hadronic collisions. In this contribution, recent ALICE measurements of the balance functions of charge, strangeness, and baryon numbers are presented. Balance functions for all combinations of identified charged-hadron ($\pi$,K,p)...
Transport properties of the matter created in heavy-ion collisions, the quark-gluon plasma (QGP), contain essential information about quantum chromodynamics (QCD). In this talk, we present our latest study in inferring the transport properties of QGP by an improved Bayesian analysis using the CERN Large Hadron Collider Pb-Pb data. The uncertainties of the extracted properties are reduced by...
For the first time, a single equation of state is used for dynamical simulations of binary neutron-star mergers and heavy-ion collisions [1]. That is done by employing the Chiral Mean Field (CMF) equation of state (EOS) [2] in self-consistent relativistic-hydrodynamic calculations for both systems. A direct comparison of the evolution of physical quantities like temperature, entropy, and...
We present a novel approach to nonperturbatively estimate the heavy quark momentum diffusion coefficient, which is a key input for the theoretical description of heavy quarkonium production in heavy ion collisions, and is important for the understanding of the elliptic flow and nuclear suppression factor of heavy flavor hadrons. In the heavy quark limit, this coefficient is encoded in the...
In a non-central nucleus-nucleus collision, the colliding system carries large orbital angular momentum, part of which remains within the hot dense matter created by the collision. This angular momentum turns into complex fluid vorticity structures in the bulk fluid, and eventually manifests itself through nontrivial rotational polarization effects. Such quantum phenomena were known in...
