Angular hadron correlations probing the early medium evolution

Renk, Thorsten; Eskola, Kari J.

doi:10.1088/0954-3899/34/8/s68

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

2007

DOI: 10.1088/0954-3899/34/8/s68

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Angular hadron correlations probing the early medium evolution

Thorsten Renk¹,

Kari J. Eskola²

Abstract: Abstract. Hard processes are a well calibrated probe to study heavy-ion collisions. However, the information to be gained from the nuclear suppression factor R AA is limited, hene one has to study more differential observables to do medium tomography. The angular correlations of hadrons associated with a hard trigger appear suitable as they show a rich pattern when going from low p T to high p T . Of prime interest is the fate of away side partons with an in-medium pathlength O(several fm). At high p T the cor… Show more

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Cited by 2 publications

References 16 publications

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Hydrodynamic description of heavy ion collisions

Nonaka¹

2007

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

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Abstract. We give a short review of hydrodynamic models at heavy ion collisions from the point of view of initial conditions, an equation of states (EoS) and freezeout process. Then we show our latest results of a combined fully three-dimensional macroscopic/microscopic transport approach. In this model for the early, dense, deconfined stage relativistic 3D-hydrodynamics of the reaction and a microscopic nonequilibrium model for the later hadronic stage where the equilibrium assumptions are not valid anymore are employed. Within this approach we study the dynamics of hot, bulk QCD matter, which is being created in ultra-relativistic heavy ion collisions at RHIC. Hydrodynamic Models at RHICThe first five years of RHIC operations at √ s N N = 130 GeV and √ s N N = 200 GeV have yielded a vast amount of interesting and sometimes surprising results. There exists mounting evidence that RHIC has created a hot and dense state of deconfined QCD matter with properties similar to that of an ideal fluid [1, 2] -this state of matter has been termed the strongly interacting Quark-Gluon-Plasma (sQGP). One of the evidence is the success of ideal hydrodynamic models in various physical observables. Especially, for the first time, in elliptic flow the hydrodynamic limit shows good agreement with the experimental data at RHIC, though at AGS and SPS hydrodynamic models give larger value as compared to experimental data.The sophisticated 3D ideal hydrodynamic calculations, however, reveal that many of experimental data have not yet been fully evaluated or understood [5]. For example, elliptic flow at forward and backward rapidity ‡ and at peripheral collisions is overestimated by ideal hydrodynamical models. The Hanbury-Brown Twiss (HBT) puzzle is not completely understood from the point of view of hydrodynamics. These distinctions between hydrodynamic calculation and experimental data suggest that the ideal hydrodynamic picture is not applicable to all physical observables even in low transverse momentum region. At present our main interest in hydrodynamic models is the following: How perfect the sQGP is? ‡ Brazil group shows improved results of v 2 at forward/backward rapidity by using event-by-event fluctuated initial conditions [3].

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Hydrodynamic description of heavy ion collisions

Nonaka¹

2007

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

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Medium effects on jet correlations in Au+Au and Cu+Cu collisions at PHENIX-RHIC

Pei¹

2008

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

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Strong di-jet correlations have been observed in p+p and d+Au collisions at GeV at RHIC. It is important to study how this jet-correlation is affected by the hot, dense medium produced in heavy-ion collisions. In this contribution, we will study how the di-jet shape evolves in Au+Au and Cu+Cu collisions compared to p+p collisions, as well as examining the medium response to the jets. We will show the results and their dependence on the collision energy, geometry, trigger and associated particle pT, and particle types.

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Angular hadron correlations probing the early medium evolution

Cited by 2 publications

References 16 publications

Hydrodynamic description of heavy ion collisions

Hydrodynamic description of heavy ion collisions

Medium effects on jet correlations in Au+Au and Cu+Cu collisions at PHENIX-RHIC

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