The PHOBOS experiment at RHIC has measured large samples of Au+Au and Cu+Cu collisions using a detector with uniquely large angular acceptance. These data enable studies of particle production over a very wide pseudorapidity interval which reveal une
xpected features. In the analysis of correlations with a high-$p_{_{T}}$ trigger particle ($p_{_{T}}>2.5$ GeV/c) a ridge extending at least 4 units of pseudorapidity was found. The results on forward-backward and two-particle correlations suggest that particles are produced in very large clusters which are wider in pseudorapidity than is expected for isotropic decays. Explanation of these experimental results requires models in which both short-range and long-range correlations are present.
The PHOBOS experiment at the Relativistic Heavy Ion Collider (RHIC) has collected a large dataset of Au+Au, Cu+Cu, d+Au and p+p collisions in the center of mass energy range spanning from 19 GeV/nucleon to 200 GeV/nucleon. The almost full angular cov
erage of the PHOBOS detector allows the study of particle production over 10 units pseudorapidity. The unique design of the spectrometer enables reconstruction and identification of charged particles down to very low transverse momenta. In this paper properties of the strongly interacting Quark-Gluon Plasma (sQGP) created in the nucleus-nucleus collisions at the highest energy available in laboratory are discussed. Results from the PHOBOS experiment on jet suppression, very low pt particles production and elliptic flow are shown. In more details are presented the most recent studies of the correlations of charged particles with respect to a high-pt trigger particle, elliptic flow fluctuations and two particle correlations.
