Conveners
Fluctuation in initial conditions, collective flow and correlations: Afternoon (1)
- Roy Lacey (Stony Brook University)
- Wojciech Broniowski (IFJ PAN)
Fluctuation in initial conditions, collective flow and correlations: Afternoon (2)
- Wojciech Broniowski (IFJ PAN)
- Roy Lacey (Stony Brook University)
Fluctuation in initial conditions, collective flow and correlations: Morning (1)
- Roy Lacey (Stony Brook University)
- Wojciech Broniowski (IFJ PAN)
We study the particles emitted in the fireball following a Relativistic Heavy Ion Collision with the traditional angular analysis employed in cosmology and earth sciences, producing Mollweide plots of the p_t distribution of a few actual, publically released ALICE-collaboration events and calculating their angular power spectrum. With the limited statistics at hand, we do not find evidence for...
The strongly intensive observable involving multiplicities in two separated rapidity intervals (forward and backward) is analyzed in the model with particle production from the fragmentation of strings. In the case with independent identical strings the model calculation confirms that this observable does not depend on nor the number of string, nor its event-by-event fluctuation. The...
The pseudorapidity density of transverse energy per charged particle ($\frac{dE_T}{d\eta}/\frac{dN_{ch}}{d\eta} \equiv E_{T}/N_{ch}$) is an important
observable in high energy heavy-ion collisions, which reveals about the mechanism of particle production and the freeze-out criteria. Its collision energy and centrality dependence is exactly like the chemical freeze-out temperature till top RHIC...
The study of azimuthal anisotropy of particles produced in Heavy Ion collisions provides strong constrains to the evolution of the strongly coupled QCD medium and its event-by-event geometry fluctuations. The strength and predominance of these observables have long been identified as a manifestation of a strong collective behaviour in the formed medium.
However recent measurements of non-zero...
The formation of the QGP in heavy-ion collisions is well established by numerous measurements and their comparison to hydrodynamic models. This matter was not expected to be formed in smaller systems, such as p--Pb or pp collisions. However, in recent years, a growing number of results in small collision systems suggest that this hot and dense medium can be created in high multiplicity p--Pb...
Angular correlation measurements are powerful tools to study jets in a transverse momentum $(p_{\rm T})$ regime where jet reconstruction algorithms are difficult to use because of the large fluctuating background. In such measurements, the relative azimuthal angle $(\Delta\varphi)$ and relative pseudorapidity $(\Delta\eta)$ of particle pairs is measured. Jets manifest themselves as a peak...
Anisotropic flow is one of the key observables used to probe the properties and evolution of the hot and dense matter produced in heavy-ion collisions.
It was recently realized that event-by-event initial geometry fluctuations in heavy-ion collisions lead to a new type of correlation between different order anisotropic flow, which has unique sensitivity to initial conditions and shear...
The angular correlation function (CF) refers to the correlation of particles in the relative pseudorapidity and relative azimuthal angle. It is used to study strongly interacting matter properties at relativistic energies. Recent results from the ALICE experiment at LHC show unexpected structures of CF in the proton-proton and antiproton-antiproton correlations. Also results from the STAR...
Measurements of azimuthal anisotropic flow provide valuable information on the properties of the matter created in heavy-ion collisions. In this talk we present the elliptic, triangular and quadrangular flow of inclusive and identified charged particles measured in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV recorded by the ALICE detector. The measurements are presented for a wide...
We study the fluctuations and correlations of the average transverse momentum of particles emitted in heavy-ion collisions. The momentum fluctuations are related to event-by-event fluctuations of the size and entropy of the initial source. Hydrodynamic calculations using a Glauber model with quark degrees of freedom reproduce the data. We study correlation of the average transverse momentum in...
We present explicit implementation of effective kinetic theory
(“bottom-up”) thermalization scenario for the transverse perturbations
in a realistic boost invariant initial conditions for heavy ion
collisions. Linearized transverse energy and momentum perturbations are
propagated by leading order weak coupling kinetic theory response
functions to the time when system is described by...
Event-by-event elliptic flow harmonic distributions $p(v_{2})$ are measured in PbPb collisions at $\sqrt{s_{NN}} = 5.02$~TeV using the CMS detector for the integrated $p_{T}$ range $0.3 < p_{T} < 3.0$~GeV/$c$ and pseudorapidity range $\left| eta \right|<1.0$. In order to gain insight on the nature of the initial geometry fluctuations, cumulant flow harmonics are calculated from the moments of...
The hot matter excited in ultrarelativistic heavy-ion collisions exhibits a sizeable
anisotropy in particle production. We formulate a generalisation of the blast-wave model which is suitable for description of higher
order azimuthal anisotropies in hadron production. The model includes anisotropy in density profile as
well as an anisotropy in the transverse expansion velocity field. These two...
