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Event-by-event hydrodynamics and elliptic flow from fluctuating initial state

Hannu Holopainen
(
- Jyvaskyla U. and
- Helsinki Inst. of Phys.
)
,
Harri Niemi
(
- Frankfurt U., FIAS
)
,
Kari J. Eskola
(
- Jyvaskyla U. and
- Helsinki Inst. of Phys.
)

Jul, 2010

10 pages

Published in:

Phys.Rev.C 83 (2011) 034901

e-Print:

1007.0368 [hep-ph]

DOI:

10.1103/PhysRevC.83.034901

Report number:

INT-PUB-10-031

View in:

reference search219 citations

Citations per year

Abstract: (arXiv)

We develop a framework for event-by-event ideal hydrodynamics to study the differential elliptic flow which is measured at different centralities in Au+Au collisions at Relativistic Heavy Ion Collider (RHIC). Fluctuating initial energy density profiles, which here are the event-by-event analogues of the eWN profiles, are created using a Monte Carlo Glauber model. Using the same event plane method for obtaining

v_2

as in the data analysis, we can reproduce both the measured centrality dependence and the

p_T

shape of charged-particle elliptic flow up to

p_T\sim2

~GeV. We also consider the relation of elliptic flow to the initial state eccentricity using different reference planes, and discuss the correlation between the physical event plane and the initial participant plane. Our results demonstrate that event-by-event hydrodynamics with initial state fluctuations must be accounted for before a meaningful lower limit for viscosity can be obtained from elliptic flow data.

Note:

10 pages, 7 figures/ v2: figures updated and v2{PP} results added

47.75.+f
25.75.Dw
25.75.Ld
charged particle: elliptic flow
energy: density
model: Glauber
hydrodynamics
Brookhaven RHIC Coll
correlation
Monte Carlo

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PHOBOS

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(
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)
,
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(
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)
,
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(
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)
,
Yogiro Hama
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)
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T. Kodama
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R.P.G. Andrade
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,
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)
,
Yogiro Hama
(
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T. Kodama
(
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)
,
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(
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,
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,
T. Pierog
(
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)
,
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(
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•
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