12-18 August 2012
US/Eastern timezone

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Event-by-event distribution of azimuthal asymmetries in ultrarelativistic heavy-ion collisions

16 Aug 2012, 16:00
Regency 1/3 and Ambassador ()

Regency 1/3 and Ambassador

Poster Global and collective dynamics Poster Session Reception


Dr Harri Niemi (University of Jyväskylä, Department of Physics)


Nowadays, relativistic dissipative fluid dynamics is a common tool to describe the space-time evolution of the quark-gluon plasma (QGP) created in ultrarelativistic heavy-ion collisions. The validity of the fluid-dynamical approach is experimentally confirmed by the fact that initial-state anisotropies are directly converted into nonvanishing (event-averaged) Fourier coefficients $\langle v_n \rangle$ of the decomposition of the single-inclusive momentum distribution of hadrons with respect to the azimuthal angle. From the magnitude of the $\langle v_n \rangle$ one can obtain information about the size of dissipative corrections and thus infer the value of the viscous coefficients of the QGP. It has been realized that, for a proper comparison to experimental data and a reliable extraction of viscosity, fluid-dynamical calculations have to be performed on an event-by-event basis. Therefore, fluid dynamics should not only be able to predict the correct event-averaged $\langle v_n\rangle$, but also their distributions. In this paper, we investigate the event-by-event distribution of the initial-state eccentricities $\varepsilon_n$, and show how they correlate with the event-by-event distribution of the Fourier coefficients $v_n$. In order to generate the initial state, we use the Monte-Carlo Glauber model of Ref.\ [1]. For the fluid-dynamical evolution, we use the model of Refs.\ [2]. The final hadron spectra are calculated with the Cooper-Frye freeze-out procedure. We demonstrate that the event-by-event distributions of the $v_n$, and not only their average values, are promising observables to gain information about the initial state of the fluid-dynamical evolution and the transport properties of the hot and dense, strongly interacting matter created in heavy-ion collisions. [1] H.~Holopainen, H.~Niemi, and K.~J.~Eskola, Phys.\ Rev.\ {\bf C83}, 034901 (2011), [arXiv:1007.0368 [hep-ph]]. [2] H.~Niemi, G.~S.~Denicol, P.~Huovinen, E.~Molnar, and D.~H.~Rischke, Phys.\ Rev.\ Lett.\ {\bf 106}, 212302 (2011), [arXiv:1101.2442 [nucl-th]]; H.~Niemi, G.~S.~Denicol, P.~Huovinen, E.~Molnar and D.~H.~Rischke, arXiv:1203.2452 [nucl-th].

Primary author

Dr Harri Niemi (University of Jyväskylä, Department of Physics)


Dirk Rischke (University Frankfurt) Dr Etele Molnar (MTA Wigner Research Centre for Physics) Gabriel Denicol (Frankfurt University) Hannu Holopainen (Frankfurt Institute for Advanced Studies) Pasi Huovinen (Johann Wolfgang Goethe-Universität)

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