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2012 | 10 | 4 | 850-857
Tytuł artykułu

Equation of state and initial temperature of quark gluon plasma at RHIC

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
In gold-gold collisions of the Relativistic Heavy Ion Collider a perfect fluid of strongly interacting quark gluon plasma (sQGP) is created. The time evolution of this fluid can be described by hydrodynamical models. After an expansion, hadrons are created during the freeze-out period. Their distribution reveals information about the final state. To investigate the time evolution one needs to analyze penetrating probes: e.g. direct photon observations. In this paper we analyze a 1+3 dimensional solution of relativistic hydrodynamics. We calculate momentum distribution, azimuthal asymmetry and momentum correlations of direct photons. Based on earlier fits to hadronic spectra, we compare photon calculations to measurements to determine the equations of state and the initial temperature of sQGP. We find that the initial temperature in the center of the fireball is 507±12 MeV, while for the sound speed we get c s=0.36±0.02. We also estimate a systematic error of these results. We find that the measured azimuthal asymmetry is also compatible with this model. We also predict a photon source that is significantly larger in the out direction than in the side direction.
Słowa kluczowe
Wydawca

Czasopismo
Rocznik
Tom
10
Numer
4
Strony
850-857
Opis fizyczny
Daty
wydano
2012-08-01
online
2012-07-17
Twórcy
  • Department of Atomic Physics, Eötvös University, Pázmány Péter s. 1/A, H-1117, Budapest, Hungary, csanad@elte.hu
autor
  • Department of Atomic Physics, Eötvös University, Pázmány Péter s. 1/A, H-1117, Budapest, Hungary
Bibliografia
  • [1] R.A. Lacey et al., Phys. Rev. Lett. 98, 092301 (2007) http://dx.doi.org/10.1103/PhysRevLett.98.092301[Crossref]
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  • [12] M. Csanád, M. Vargyas, Eur. Phys. J. A 44, 473 (2010) http://dx.doi.org/10.1140/epja/i2010-10973-3[Crossref]
  • [13] Z. Fodorm S. D. Katz, In: The Landolt-Börnstein Database, edited by R. Stock (Springer-Verlag, Heidelberg, 2010), 1, 0908.3341
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  • [21] A. Adare et al. (PHENIX Collaboration) (2011)
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_s11534-012-0060-9
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