Conveners
CD: 1
- Sergey Voloshin (Wayne State University (US))
CD: 2
- Jean-Yves Ollitrault (CNRS)
CD: 3
- Michael Andreas Winn (Universitรฉ Paris-Saclay (FR))
CD: 4
- Soumya Mohapatra (Columbia University (US))
CD: 5
- Roy Lacey (Stony Brook University)
In this contribution we will present the latest results on two-particle number and transverse momentum correlations from the ALICE Collaboration in order to study the initial stages and dynamic evolution of nucleus-nucleus collisions from small to large systems.
In pp and p-Pb collisions, the physical origin of long-range flow-like correlations remains an open question, with implications...
We present the time resolved evolutions of the anisotropic flow coefficient $v_n$ with consideration of both the linear and non-linear dependence on the initial eccentricities $\epsilon_m$. The relativistic Boltzmann equation is utilized in the few collision regime in order to model the evolution of the phase space distribution.
Our analytically calculated time-dependent flow harmonics are...
Measurements of two-particle correlations in $pp$ collisions show features that are strikingly similar to those seen in heavy-ion collisions, suggesting that a tiny droplet of the QGP is produced even in such collisions. In the $pp$ collisions models that attribute the correlations to semi-hard processes can also qualitatively reproduce the measurements. In this talk, we report on a series of...
The understanding of heavy ion collisions and its quark-gluon plasma (QGP) formation requires a complicated interplay of rich physics in a wealth of experimental data. In this talk I will show how for identified particles as a function of transverse momentum both the spectra as well as the anisotropic flow coefficients for both PbPb and $p$Pb collisions can be compared in a global analysis of...
In this presentation, measurements of $v_2$ and $v_3$, in the p/d/$^3$He+Au collisions at 200 GeV will be shown as a function of $p_{T}$ and multiplicity from STAR. The non-flow is studied with several different methods using p+p collision as a reference. It has been found that non-flow subtracted $v_{n}$ signals are not sensitive to these methods. The $v_2$ signals are also extracted using...
Momentum anisotropies caused by collective flow phenomena in HICs have been known to convey a rich amount of information on the collision geometry. In pp and pA collisions the system size is too small for the hydrodynamic description of these anisotropies to be applicable. Instead, a microscopic description of the non-equilibrium dynamics has to be employed. Indeed, kinetic theory simulations...
Charged particle multiplicity spectra and hadron entropies are measured using the H1 detector at HERA, where positrons of energy 27.6 GeV collided with protons of energy 920 GeV. For the analysis, data on deep-inelastic scattering in the momentum transfer range $5< Q^2< 100$ GeV$^2$ and inelasticity range $0.0375< y< 0.6$ are used. The observed multiplicity spectra of charged hadrons are...
Medium induced parton energy loss is not conclusively established neither in very peripheral heavy-ion collisions nor in proton-ion collisions. However, the standard interpretation of azimuthal momentum anisotropies in theses systems implies some partonic rescattering. The upcoming light-ion runs at the LHC provide a unique opportunity to search for parton energy loss in different systems of...
We present the recent results of J/$\psi$-jet correlation and the cross-sections Y(nS) states in heavy-ion collisions, using the data collected by the CMS experiment at $\sqrt{s_{\rm{NN}}}=5.02$~TeV.
J/$\psi$ production has long been known to be modified in heavy-ion collisions, via, among many, the Debye screening effect. Indirect evidence of, in particular, the non-vanishing $v_{2}$ of...
Using Bayesian inference, we present state-of-the-art quantifications of initial conditions as well as pre-hydrodynamic and hydrodynamic transport properties of quark-gluon plasma based on hadronic observables from both the Relativistic Heavy Ion Collider and the Large Hadron Collider [1,2]. Estimations of initial state properties are performed by marginalizing over the theoretical...
The observation of fluid-like behavior in nucleus-nucleus (AA), proton-nucleus (pA) and high-multiplicity proton-proton (pp) collisions motivates systematic studies of how different measurements approach their fluid-dynamic limit. We have developed numerical methods to solve the ultra-relativistic Boltzmann equation for systems of arbitrary size and transverse geometry. Here, we apply these...
We present the elliptic azimuthal anisotropy coefficient ($v_2$) of the identified strange hadrons ($K_{S}^{0}$ and $\Lambda$) in pPb and PbPb collisions at 5.02 TeV, and the heavy-flavor hadrons ( J/psi, D$^0$) in pPb at 8.16 TeV and high-multiplicity pp at 13 TeV, using data collected by the CMS experiment at the LHC.
The $v_2$ values of identified strange hadrons were measured for the...
Heavy-ion collisions at ultra-relativistic energies at the LHC provide a unique opportunity to study the strongly interacting quark-gluon plasma (QGP). Anisotropic flow phenomena provide valuable information on the initial conditions of heavy-ion collisions, the transport coefficients, and the dynamic evolution of the created QGP. In this talk, we present investigations of the...
In this talk, we present our recent investigations on hydrodynamic collectivity in high-multiplicity proton--proton collisions at 13 TeV using the VISHNU hybrid model with different initial condition models, called HIJING, super-MC and TRENTo. We find that with carefully tuned parameters, hydrodynamic simulations can give reasonable descriptions of the measured two-particle correlations....
Multiparticle azimuthal correlations have proved their usefulness to study and constrain the properties of the quark-gluon plasma (QGP) produced in ultrarelativistic heavy-ion collisions. Recently, the event-by-event correlated fluctuations between two different flow amplitudes have been measured using Symmetric Cumulants. These results exhibit a better sensitivity to the transport properties...
In this presentation, we show measurements of the second Fourier coefficient of the azimuthal distribution (elliptic flow, v2) of prompt D0 and D0bar mesons using the four-particle cumulants technique at midrapidity (|y| < 1). These measurements are performed using data from PbPb collisions at 5.02 TeV collected by the CMS detector at the LHC in 2018. The v2 of prompt D0 and D0bar mesons are...
Building upon Ref. [1], we present an improved three-dimensional dynamical initialization model for heavy-ion collisions, implementing local energy-momentum conservation and baryon charge fluctuations at string junctions [2]. These improvements lead to an excellent description of the charged hadron and net proton rapidity distributions in Au+Au collisions from 7.7 to 200 GeV. Based on these...
