Review of results from the NA49 Collaboration

Abstract

New results of the NA49 Collaboration on strange particle production are presented. Rapidity and transverse mass spectra as well as total multiplicities are discussed. The study of their evolution from AGS over SPS to the highest RHIC energy reveals a couple of interesting features. These include a sudden change in the energy dependence of the mt-spectra and of the yields of strange hadrons around 30 A GeV. Both are found to be difficult to be reproduced in a hadronic scenario, but might be an indication for a phase transition to a quark–gluon plasma.

Recent results from the NA49 experiment

“…PoS(HEP2005)125 Figure 5: Left: The total number of strange quarks and anti-quarks as carried by kaons and hyperons versus the collision energy for central Pb+Pb (Au+Au) reactions (details see [12]). The line represents a linear fit to the low energy data.…”

ΛΛCorrelation Function inAu+AuCollisions atsAdamczyk1, Adkins2, Agakishiev3 et al. 2015Phys. Rev. Lett.125111341View full textAdd to dashboardCite

“…The STAR experiment has searched for strangelet production close to the beam rapidity at RHIC and has reported an upper limit for strangelets [16]. The NA49 experiment at the super proton synchrotron attempted to measure the ΛΛ correlation function in heavyion collisions, but their statistics were insufficient to draw physics conclusions [17]. The observed high yield of multistrange hyperons in central nucleus-nucleus collisions at RHIC [18] and recent high-statistics data for Au þ Au collisions at RHIC provide a unique opportunity to study ΛΛ correlations and search for exotic particles like the H dibaryon.…”

Multiplicity fluctuations in the string clustering approach

“…Event-by-event fluctuations of transverse momentum have been measured both at CERN SPS [1][2][3][4][5][6] and BNL RHIC [7][8][9][10][11]. The data show a non-trivial behaviour as a function of the centrality of the collision.…”