In this paper, the authors report on the observed differences in production rates of strange and multistrange baryons in Au+Au collisions at √sNN=200 GeV compared to p+p interactions at the same energy.
Abstract:
We report on the observed differences in production rates of strange and multistrange baryons in Au+Au collisions at √sNN=200 GeV compared to p+p interactions at the same energy. The strange baryon yields in Au+Au collisions, when scaled down by the number of participating nucleons, are enhanced relative to those measured in p+p reactions. The enhancement observed increases with the strangeness content of the baryon, and it increases for all strange baryons with collision centrality. The enhancement is qualitatively similar to that observed at the lower collision energy √sNN=17.3 GeV. The previous observations are for the bulk production, while at intermediate pT,1<pT<4 GeV/c, the strange baryons even exceed binary scaling from p+p yields.
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Q2. What is the reason for the deviation from theory?
One explanation for this deviation from theory is that the volume responsible for strangeness production is not linearly proportional to the geometrical overlap region, as assumed in the model.
Q3. What is the effect of radial flow in the Au+Au data?
Effects due to radial flow in the Au+Au data are significant at RHIC energies, even for the multistrange baryons [24], but flow dominates only at low pT .
Q4. What is the effect of the GC ensemble?
A GC model, with a chemical freeze-out temperature of T = 165 MeV and a baryon chemical potential µb = 29 MeV, calculates enhancements of E( −) = 10.7 and E( ) = 2.6 for the most central Au+Au events at √sNN = 200 GeV [12].
Q5. What is the effect of the pT distributions of the particles?
Since the pT distributions of the particles are approximately exponential, these results are dominated by the physics occurring at pT <∼ 2 GeV/c. Differences in the pT distributions for p+p and Au+Au data are studied by calculating the nuclear modification factor, i.e.,RAA(pT , i) = d 2NAA(i)/dpT dyTAA d2σNN (i)/dpT dy , (2)where TAA = 〈Nbin〉/σNNinel .
Q6. What is the effect of the GC ensemble approach?
This model allows for an oversaturation of strange quarks, which varies with centrality, and thus does not invoke chemical equilibration.
Q7. What are the contributions to the systematic uncertainty of particle yields?
Several contributions to the systematic uncertainty of particle yields were studied: detector simulation and efficiency calculations, inhomogeneities of the detector responses, pileup effects, and the extrapolation of the data fits to zero pT .