Refine
Year of publication
Document Type
- Preprint (26)
- Article (13)
- Conference Proceeding (1)
- Working Paper (1)
Language
- English (41) (remove)
Has Fulltext
- yes (41)
Is part of the Bibliography
- no (41)
Keywords
- 900 GeV (1)
- ALICE (1)
- Charge fluctuations (1)
- LHC (1)
- PYTHIA (1)
- QGP (1)
- Relativistic heavy-ion collisions (1)
- Transverse momentum (1)
Institute
A non-monotonic energy dependence of the K + / pi + ratio with a sharp maximum close to 30 A GeV is observed in central Pb+Pb collisions. Within a statistical model of the early stage, this is interpreted as a sign of the phase transition to a QGP, which causes a sharp change in the energy dependence of the strangeness to entropy ratio. This observation naturally motivates us to study the production of multistrange hyperons (Xi, Omega) as a function of the beam energy. Furthermore it was suggested that the kinematic freeze-out of Omega takes place directly at QGP hadronization. If this is indeed the case, the transverse momentum spectra of the Omega directly reflect the transverse expansion velocity of a hadronizing QGP. In this report we show preliminary NA49 results on Omega - and Omega + production in central Pb+Pb collisions at 40 and 158 A GeV and compare them to measurements of Xi - and Xi + production in central Pb+Pb collisions at 30, 40, 80 and 158 A GeV.