Ξ- and (Ξ)over-bar+ production in central Pb+Pb collisions at 158 GeV/c per nucleon

被引：78

作者：

Afanasiev, SV ^{[1
]}

Anticic, T

Barna, D

Bartke, J

Barton, RA

Betev, L

Bialkowska, H

Billmeier, A

Blume, C

Blyth, CO

Boimska, B

Botje, M

Bracinik, J

Bramm, R

Brun, R

Buncic, P

Cerny, V

Cramer, JG

Csató, P

Dinkelaker, P

Eckardt, V

Filip, P

Fischer, HG

Fodor, Z

Foka, P

Freund, P

Friese, V

Gál, J

Gazdzicki, M

Georgopoulos, G

Gladysz, E

Hegyi, S

Höhme, C

Igo, G

Jones, PG

Kadija, K

Karev, A

Kolesnikov, VI

Kollegger, T

Kowalski, M

Kraus, I

Kreps, M

van Leeuwen, M

Lévai, P

Malakhov, AI

Margetis, S

Markert, C

Mayes, BW

Melkumov, GL

Mischke, A

机构：

[1] Joint Inst Nucl Res, Dubna, Russia

[2] NIKHEF H, NL-1009 DB Amsterdam, Netherlands

[3] Univ Athens, Dept Phys, Athens, Greece

[4] Univ Birmingham, Birmingham, W Midlands, England

[5] Comenius Univ, Bratislava, Slovakia

[6] KFKI Res Inst Particle & Nucl Phys, Budapest, Hungary

[7] MIT, Cambridge, MA 02139 USA

[8] Inst Nucl Phys, Krakow, Poland

[9] Gesell Schwerionenforsch mbH, GSI, Darmstadt, Germany

[10] Goethe Univ Frankfurt, Fachbereich Phys, D-6000 Frankfurt, Germany

[11] CERN, Geneva, Switzerland

[12] Univ Houston, Houston, TX USA

[13] Kent State Univ, Kent, OH 44242 USA

[14] Univ Calif Los Angeles, Los Angeles, CA USA

[15] Univ Marburg, Fachbereich Phys, D-3550 Marburg, Germany

[16] Inst Nucl Studies, PL-00681 Warsaw, Poland

[17] Univ Warsaw, Inst Expt Phys, Warsaw, Poland

[18] Univ Washington, Nucl Phys Lab, Seattle, WA 98195 USA

[19] Rudjer Boskovic Inst, Zagreb, Croatia

[20] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

来源：

PHYSICS LETTERS B | 2002年 / 538卷 / 3-4期

基金：

匈牙利科学研究基金会; 美国国家科学基金会; 英国工程与自然科学研究理事会;

关键词：

cascade; anticascade; strangeness enhancement; multi-strange hyperons; integrated yields; heavy-ion collisions; NA49;

D O I：

10.1016/S0370-2693(02)01970-6

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Results of the production of Xi(-) and (Xi) over bar (+) hyperons are presented for the 10% most central Pb+Pb interactions at 158 GeV/c per nucleon where the average number of participants N-part is about 335. This analysis utilises a global reconstruction procedure, which allows a measurement of 4pi integrated yields to be made for the first time. Inverse slope parameters, which are determined from an exponential fit to the transverse mass spectra, are found to be 267 +/- 9 MeV and 296 +/- 17 MeV for Xi(-) and (Xi) over bar (+) hyperons, respectively. Mid-rapidity densities (dN/dy) are found to be 1.49 +/- 10.08 and 0.33 +/- 0.04 particles per event per unit rapidity for Xi(-) and (Xi) over bar (+) respectively. The ratio R((Xi) over bar (+)Xi(-)) at mid-rapidity, R(y = y(cm)), is found to be 0.22 +/- 0.03.Yields integrated to full phase space are found to be 4.12 +/- 0.20 and 0.77 +/- 0.04 particles per event for Xi(-) and (Xi) over bar and respectively. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：275 / 281

页数：7

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