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3 Nukleonika

3 2004

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Stable Bose-Einstein correlations

Csörgo T., Hegyi S., Zajc W.

Nukleonika

2004

Vol. 49,suppl.2

7-10

The shape of Bose-Einstein (or HBT) correlation functions is determined for the case when particles are emitted from a stable source, obtained after convolutions of large number of elementary random processes. The two-particle correlation function is shown to have a stretched exponential shape, characterized by the Lévy index of stability 0 < alfa less-than or equal to 2 and the scale parameter R. The normal, Gaussian shape corresponds to a particular case, when alfa = 2 is selected. The asymmetry parameter of the stable source, beta is shown to be proportional to the angle, measured by the normalized three-particle cumulant correlations.

Buda-Lund hydro model and the elliptic flow at RHIC

Csanád M., Csörgo T., Lörstad B., Ster A.

Nukleonika

2004

Vol. 49,suppl.2

45-48

The ellipsoidally symmetric Buda-Lund hydrodynamic model describes naturally the transverse momentum and the pseudorapidity dependence of the elliptic flow in Au+Au collisions at sNN = 130 and 200 GeV. The result confirms the indication of quark deconfinement in Au+Au collisions at RHIC, obtained from Buda-Lund hydro model fits to combined spectra and HBT radii of BRAHMS, PHOBOS, PHENIX and STAR.

A hint at quark deconfinement in 200 GeV Au+Au data at RHIC

Csanád M., Csörgo T., Lörstad B., Ster A.

Nukleonika

2004

Vol. 49,suppl.2

49-55

We give the emission function of the axially symmetric Buda-Lund hydro model and present its simultaneous, high quality fits to identified particle spectra, two-particle Bose-Einstein or HBT correlations and charged particle pseudorapidity distributions as measured by BRAHMS and PHENIX in 0 30% central, square root sNN = 200 GeV Au+Au collisions at RHIC. The best fit is achieved when the most central region of the particle emitting volume is superheated to T0 = 200 š 9 MeV greater-than or equal to Tc = 172 š 3 MeV, a 3sigma effect.