Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2002-04-09
Acta Phys.Polon. B33 (2002) 1935-1948
Physics
Nuclear Physics
Nuclear Theory
Discussion of the crossing of antiproton and pi- spectra modified, a reference added
Scientific paper
We show, by means of a simple compilation of the available experimental results, that the pT-spectra obtained at RHIC and SPS are strikingly similar up to pT ~ 1.5-2 GeV. In fact, the discrepancies between various experimental groups working at the same experiment are of the same size as the differences between RHIC and SPS. Our observation is complementary to the well known fact of the equality of the measured R_side and R_out HBT radii at RHIC and SPS. In essence, it points out that the transverse size of the firecylinder and the strength of the transverse flow are not significantly changed between SPS and RHIC. This suggests that a saturation mechanism is effective already at SPS. We also point out that the dominance of protons over pi^+ at large pT can be seen not only in the RHIC data, but already in the SPS data.
Broniowski Wojciech
Florkowski Wojciech
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