Quark Matter 2015 - XXV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

Session

Collective Dynamics IV

30-4

30 Sept 2015, 10:50

Kobe, Fashion Mart, Japan

Conveners

Collective Dynamics IV

• Raimond Snellings (Nikhef National institute for subatomic physics (NL))

370. PHENIX results on centrality dependence of yields and correlations in $d$$+$Au collisions

Takao Sakaguchi (BNL)

30/09/2015, 10:50

Collective Dynamics

Contributed talk

Measurements of the $v_2$ of identified hadrons and of azimuthal correlations between rapidity separated soft particles strongly suggest the presence of collective effects in central $d$$+$Au collisions at $\sqrt{s_{NN}}$=200 GeV. The good agreement between low viscosity hydrodynamic calculations and experimental results also suggests a close relationship between the effects observed...

475. Higher harmonic anisotropic flow of identified particles in Pb-Pb collisions with the ALICE detector

Naghmeh Mohammadi (Nikhef National institute for subatomic physics (NL))

30/09/2015, 11:10

Collective Dynamics

Contributed talk

Anisotropic flow plays a critical role in establishing the equation of state for the Quark Gluon Plasma. The results at the LHC have demonstrated that the matter created in heavy-ion collisions behaves as a nearly perfect fluid reflected in the low value of the shear viscosity over entropy density ratio ($\eta$/s). The higher flow harmonics are particularly sensitive to the value of $\eta$/s...

698. Principle Component Analysis of two-particle correlations in PbPb and pPb collisions at CMS

Jovan Milosevic (University of Belgrade (RS))

30/09/2015, 11:30

Collective Dynamics

Contributed talk

A Principle Component Analysis (PCA) of two-particle azimuthal correlations as a function of transverse momentum ($p_T$) is presented in PbPb collisions at 2.76 TeV and high-multiplicity pPb collisions at 5.02 TeV. The data were recorded using the CMS detector at the LHC. It has recently been shown that factorization breaking of two-particle azimuthal correlations can be attributed to the...

119. Pinning down QCD-matter shear viscosity in A+A collisions via EbyE fluctuations using pQCD + saturation + hydrodynamics

Harri Niemi (Johann Wolfgang Goethe-Universität)

30/09/2015, 11:50

Collective Dynamics

Contributed talk

We compute the initial fluctuating QCD-matter energy densities produced in ultrarelativistic heavy-ion collisions from NLO perturbative QCD using a saturation conjecture to control soft particle production [1], and describe the subsequent space-time evolution of the system with dissipative fluid dynamics [2], event by event [3]. The resulting centrality dependence of hadronic multiplicities,...

90. Elliptic Anisotropy $v_2$ May Be Dominated by Particle Escape instead of Hydrodynamic Flow

Zi-Wei Lin (ECU)

30/09/2015, 12:10

Collective Dynamics

Contributed talk

It is commonly believed that azimuthal anisotropies in relativistic heavy ion collisions are generated by hydrodynamic evolution of the strongly interacting quark-gluon plasma. Recently, apparent anisotropy signals have been observed in small systems of proton- and deuteron-nucleus collisions, and the signals can again be described by hydrodynamics. A natural question is why hydrodynamics...