Results from NA49

Centrality and rapidity dependence of particle ratios in Au+Au and Cu+Cu collisions at \sqrt{s_{\rm NN}} = 62.4 GeV

“…We also observe that the K/π ratios measured in peripheral Au+Au reactions are smaller than the ones measured at the same number of participants but in central Cu+Cu collisions. This observation was also made at SPS energies and interpreted as being due to the different mean number of N+N collisions per projectile [7]. The theoretical calculations shown are made only for Au+Au collisions over the entire N part interval covered by nucleus-nucleus data.…”

“…The ratio of strange to non-strange particles measured in all A+A collisions shows an enhancement compared to the N+N reactions considered at the same energy. This enhancement depends on energy [4,5], system size [6,7], and collision geometry [8]. In this work we will concentrate on the dependence of the average transverse momenta, ratios of yields of anti-hadrons to hadrons (π − /π + , K − /K + , andp/p), and K/π ratios on the system size and geometry at mid-and forward rapidity.…”

Strangeness Saturation: Dependence on System-Size, Centrality and Energy

“…2 that the thermal model delivers for pp andpp collisions [ 11] values of γ s compatible with peripheral collisions. [ 12,13] and central C+C and Si+Si data [ 9] under various fit conditions, assuming 50% feeding from weak decays. Also shown is the fraction of participants which underwent multiple collisions, f 2 .…”

QCD equation of state: Physical quark masses and asymptotic temperatures

“…Within the past years, physicists aimed at revealing the very nature of strongly interacting matter experimentally by ultra-relativistic heavy-ion collisions performed at CERN-SPS and BNL-RHIC (see e. g. [1,2]). At the large local energy densities reached during the collision process, a new state of deconfined matter, dubbed quark-gluon plasma (QGP), is thought to be created.…”