Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2012-02-29
Physics
Nuclear Physics
Nuclear Theory
6 pages, 3 figures, Presented at the VII Workshop on Particle Correlations and Femtoscopy (WPCF2011), Tokyo, Japan, September
Scientific paper
We investigate the two-pion interferometry in ultrarelativistic heavy ion collisions in the granular source model of quark-gluon plasma droplets. The pion transverse momentum spectra and HBT radii of the granular sources agree well with the experimental data of the most central Au-Au collisions at $\sqrt{s_{NN}}=200$ GeV at RHIC and Pb-Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV at LHC. In the granular source model the larger initial system breakup time for the LHC collisions as compared to the RHIC collisions may lead to the larger HBT radii $R_{\rm out}$, $R_{\rm side}$, and $R_{\rm long}$. However, the large droplet transverse expansion and limited average relative emitting time of particles in the granular source lead to the ratio of the transverse HBT radii $R_{\rm out}/R_{\rm side} \sim 1$.
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