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Article overview
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Multistrange Hyperon Production in Pb+Pb collisions at 30, 40, 80 and 158 A$cdot$GeV | Michael Mitrovski
; for the NA49 collaboration
; | Date: |
29 Dec 2003 | Journal: | Prog.Part.Nucl.Phys. 53 (2004) 269-272 | Subject: | nucl-ex | Abstract: | A non-monotonic energy dependence of the $K^{+} / pi^{+}$ ratio with a sharp maximum close to 30 A$cdot$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 $ar{Omega}^{+}$ production in central Pb+Pb collisions at 40 and 158 A$cdot$GeV and compare them to measurements of $Xi^{-}$ and $ar{Xi}^{+}$ production in central Pb+Pb collisions at 30, 40, 80 and 158 A$cdot$GeV. | Source: | arXiv, nucl-ex/0312022 | Services: | Forum | Review | PDF | Favorites |
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