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Paul Seibert (1921-1997)
(1997)
Am 14. Juni 1997 verstarb Universitätsprofessor Dr. rer. nat. Paul Seibert im 77. Lebensjahr. Sowohl Geobotanik als auch Forstwissenschaft haben einen hervorragenden Vertreter verloren. Der vorliegende Nachruf würdigt den Verstorbenen und setzt das Verzeichnis der Schriften von Paul Seibert (begonnen in Tuexenia 11) fort.
Using the NA49 main TPC, the central production of hyperons has been measured in CERN SPS Pb - Pb collisions at 158 GeV c-1. The preliminary ratio, studied at 2.0 < y < 2.6 and 1 < pT < 3 GeV c-1, equals ~ (13 ± 4)% (systematic error only). It is compatible, within errors, with the previously obtained ratios for central S + S [1], S + W [2], and S + Au [3] collisions. The fit to the transverse momentum distribution resulted in an inverse slope parameter T of 297 MeV. At this level of statistics we do not see any noticeable enhancement of hyperon production with the increased volume (and, possibly, degree of equilibration) of the system from S + S to Pb + Pb. This result is unexpected and counterintuitive, and should be further investigated. If confirmed, it will have a significant impact on our understanding of mechanisms leading to the enhanced strangeness production in heavy-ion collisions.