QGP properties from flow and correlations

21 May 2014, 12:50
europium (darmstadtium)



Schlossgraben 1 64283 Darmstadt Germany
Contributed Talk Collective Dynamics Correlations and fluctuations


Chiho Nonaka (Nagoya University)


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

Primary author

Chiho Nonaka (Nagoya University)


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

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