### Speaker

Chiho Nonaka
(Nagoya University)

### Description

Recently the results of azimuthal HBT measurements with respect to
the second and third order event plane are presented by PHENIX [1].
They extract $\epsilon_2$ and $\epsilon_3$ from the HBT radii
which contain information about not only the source shape at freezeout
but also the space-time evolution of QGP matter.
They show the relation between initial $\epsilon_{2, 3}$ which are obtained
using a Glauber model and final $\epsilon_{2,3}$ which are extracted from
the HBT radii.
They find that the final $\epsilon_2$ from the HBT radii is finite and smaller
than the initial $\epsilon_2$.
On the other hand, the final $\epsilon_3$ is vanishing, in spite of existence of
finite initial $\epsilon_3$.
The interesting different response of $\epsilon_2$ and $\epsilon_3$ during
space-time evolution gives us a clue to understand the detailed QGP properties.
For analyses of such high statistics experimental results, we develop a
state of the art numerical scheme of causal viscous hydrodynamics for
relativistic heavy ion collisions, which has a shock-wave capturing scheme and less
numerical dissipation [2]. Furthermore, using the hydrodynamic algorithm,
we construct a hybrid model of hydrodynamic model plus UrQMD to include the realistic
freezeout processes.
Using the model we investigate the time evolution of spatial anisotropies $\epsilon_n$.
We find that the sign of $\epsilon_3$ changes from positive to negative during the space-time evolution,
which suggests a solution of the vanishing final $\epsilon_3$ from the HBT radii by PHENIX.
From detailed analyses from flow and correlations, we discuss the initial conditions of
hydrodynamic model and the detailed QGP properties such as transport coefficients.
[1] T. Niida for the PHENIX collaboration, Nucl. Phys. A 904-905C (2013) pp. 439-442 [arXiv:1304.2876]
[2] Y. Akamatsu, S. Inutsuka, C. Nonaka, M. Takamoto, J. Comp. Phys. (2014), pp. 34-54, [arXiv:1302.1665]

On behalf of collaboration: | None |
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### Primary author

Chiho Nonaka
(Nagoya University)

### Co-authors

Mr
Jonah Bernhard
(Duke Univesrity)
Prof.
Steffen A. Bass
(Duke University)
Yukinao Akamatsu
(Nagoya University)