Ξ(Ω) production in Pb+Pb collisions at 158 GeV c-1

被引：0

作者：

Odyniec, G ^{[1
]}

机构：

[1] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

来源：

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS | 1997年 / 23卷 / 12期

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中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Using the NA49 main TPC, the central production of (Xi + <(Xi)over bar>) hyperons has been measured in CERN SPS Pb-Pb collisions at 158 GeV c(-1). The preliminary (Xi + <(Xi)over bar>)/(Lambda + <(<Lamda>)over bar>) ratio, studied at 2.0 < y < 2.6 and I < p(T) < 3 GeV c(-1), equals similar to(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.

引用

页码：1827 / 1835

页数：9

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