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System size dependence of strangeness production at 158 GeV/n | | I.Kraus
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17 Jun 2003 | | Journal: | J.Phys. G30 (2004) S583-S588 | | Subject: | nucl-ex | | Affiliation: | for the NA49 collaboration | | Abstract: | An enhanced production of strange particles per pion in heavy ion collisions compared to elementary p+p interactions was observed in Pb+Pb reactions at the CERN SPS. New results obtained on small colliding systems, C+C and Si+Si, also show an enhancement. It increases steeply with system size and reaches in the larger system almost the level measured in Pb+Pb reactions. The shapes of the transverse mass spectra of strange mesons (K+, K-, phi) and baryons (Lambda, Antilambda) are consistent with the presence of collective transverse flow, which is already visible in small systems (C+C) and increases with the system size. The Antilambda/Lambda ratio together with the K+/K- ratio yields information about the baryochemical potential mu_B. The potential, determined at midrapidity, increases with the system size since the stronger stopping shifts baryons from near beam and projectile rapidity towards midrapidity. For the 4pi yields mu_B is almost independent of the size of the colliding system. | | Source: | arXiv, nucl-ex/0306022 | | Services: | Forum | Review | PDF | Favorites | |
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