A study of &lt;FONT FACE=Symbol&gt;á&lt;/FONT&gt;v2&lt;FONT FACE=Symbol&gt;ñ&lt;/FONT&gt; with NeXSPheRIO

Andrade, Raquel Dully; Hama, Yogiro; Grassi, F.; Socolowski, O.; Kodama, Takeshi

doi:10.1590/s0103-97332007000100029

Cited by 4 publications

(3 citation statements)

References 4 publications

(6 reference statements)

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“…Assuming a negligible non-flow component in equation 16, it is possible to take the difference v 2 {2} 2 − v 2 {4} 2 as an estimate of the absolute flow fluctuation. An estimate for the relative flow fluctuation can also be defined by using the equations 14 and 15 as:…”

Section: B Flow Fluctuationsmentioning

confidence: 99%

“…Furthermore, two or more particle correlations may carry important information on the initial state, hence on the mechanism of QCD dynamics at the very early stage of the collision. Recent studies [13][14][15][16][17][18][19][20][21] show that a scenario including fluctuations of the initial condition in addition to the geometrical eccentricity describes better the experimental data than without the inclusion of initial state fluctuations. These fluctuations in the initial condition will affect the eccentricity by changing the average value and also by introducing an additional fluctuation which will then affect the final observed v 2 values.…”

Section: Introductionmentioning

confidence: 99%

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Effects of initial state fluctuations in the final state elliptic flow measurements using the NeXSPheRIO model

et al. 2012

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We present a systematic study of the effects due to initial condition fluctuations in systems formed by heavy-ion collisions using the hydrodynamical simulation code NeXSPheRIO. The study was based on a sample of events generated simulating Au+Au collisions at center of mass energy of 200 GeV per nucleon pair with impact parameter ranging from most central to peripheral collisions. The capability of the NeXSPheRIO code to control and save the initial condition (IC) as well as the final state particles after the 3D hydrodynamical evolution allows for the investigation of the sensitivity of the experimental observables to the characteristics of the early IC. Comparisons of results from simulated events generated using fluctuating initial conditions and smooth initial condition are presented for the experimental observable elliptic flow parameter (v2) as a function of the transverse momentum, pt, and centrality. We compare v2 values estimated using different methods, and how each method responds to effects of fluctuations in the initial condition. Finally, we quantify the flow fluctuations and compare to the fluctuations of the initial eccentricity of the energy density distribution in the transverse plane.

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Section: B Flow Fluctuationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of initial state fluctuations in the final state elliptic flow measurements using the NeXSPheRIO model

et al. 2012

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“…In the soft transverse momentum region (p t < ∼ 2 GeV/c) measurements at mid-rapidity are found to be well described by hydrodynamical models [7,8]. By contrast, differential measurement of the pseudo-rapidity dependence of elliptic flow and its excitation function have resisted several attempts at a description in terms of hydrodynamical models (but see their description by the SPHERIO model [9,10] or the approximate descriptions in refs. [11,12]).…”

Section: A Introductionmentioning

confidence: 99%

Universal scaling of the elliptic flow data at RHIC

et al. 2008

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Abstract. Recent PHOBOS measurements of the excitation function for the pseudo-rapidity dependence of elliptic flow in Au+Au collisions at RHIC, have posed a significant theoretical challenge. We show here that these data are described by the Buda-Lund model. A universal scaling curve, predicted by the Buda-Lund hydro model, describes not only PHOBOS data, but also recent, detailed PHENIX and STAR elliptic flow data. This is a consequence of perfect fluid hydrodynamics as implemented in the Buda-Lund hydro model. [ 1, 2, 3, 4, 5]) reveal rich details in terms of its dependence on particle type, transverse (p T ) and longitudinal momentum (η) variables, and on the centrality and the bombarding energy of the collision. In the soft transverse momentum region (p T 2 GeV/c), the measurements at mid-rapidity are found to be reasonably well described by hydrodynamical models [ 6,7]. By contrast, differential measurement of the pseudo-rapidity dependence of elliptic flow v 2 (η), and its excitation function have resisted several attempts at a description in terms of hydrodynamical models (but see their new description by the SPHERIO model [ 8]). Here we show that these data are consistent with the theoretical and analytic predictions that are based on Eqs. (1-6) of Ref. [ 9], that is, on perfect fluid hydrodynamics.There is a confusion in the literature if perfect or perhaps an ideal fluid has

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A systematic study on direct photon production from central heavy-ion collisions

Liu

Werner

2009

J. Phys. G: Nucl. Part. Phys.

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A theoretical derivation of photon bremsstrahlung, induced by the interactions of an energetic quark in a hot and dense quark-gluon plasma, is given in the framework of the reaction operator approach. For the physically relevant case of hard jet production, followed by few in-medium interactions , we find that the Landau-Pomeranchuk-Migdal suppression of the bremsstrahlung photon intensity is much stronger than in the previously discussed limit of on-shell quarks and a large number of soft scatterings. This result is incorporated in the first systematic study of direct photon production in minimum bias d+Cu and d+Au and central Cu+Cu and Au+Au heavy ion collisions at the Relativistic Heavy Ion Collider at center of mass energies √ s = 62.4 GeV and 200 GeV. We find that the contribution of the photons created via final-state interactions is limited to 35% for 2 GeV< pT < 5 GeV and at high transverse momenta the modification of the direct photon cross section is dominated by initial-state cold nuclear matter effects.

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A study of <FONT FACE=Symbol>á</FONT>v2<FONT FACE=Symbol>ñ</FONT> with NeXSPheRIO

Cited by 4 publications

References 4 publications

Effects of initial state fluctuations in the final state elliptic flow measurements using the NeXSPheRIO model

Effects of initial state fluctuations in the final state elliptic flow measurements using the NeXSPheRIO model

Universal scaling of the elliptic flow data at RHIC

A systematic study on direct photon production from central heavy-ion collisions

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