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

被引：53

作者：

Appelhäuser, H

Bächler, J

Bailey, SJ

Barna, D

Barnby, LS

Bartke, J

Barton, RA

Bialkowska, H

Billmeier, A

Blyth, CO

Bock, R

Bormann, C

Brady, FP

Brockmann, R

Brun, R

Buncic, P

Caines, HL

Carr, LD

Cebra, D

Cooper, GE

Cramer, JG

Cristinziani, M

Csato, P

Dunn, J

Eckardt, V

Eckhardt, F

Ferguson, MI

Fischer, HG

Flierl, D

Fodor, Z

Foka, P

Freund, P

Friese, V

Fuchs, M

Gabler, F

Ganz, R

Geist, W

Gal, J

Gazdzicki, M

Gladysz, E

Grebieszkow, J

Günther, J

Harris, JW

Hegyi, S

Henkel, T

Hill, LA

Hümmler, H

Igo, G

Irmscher, D

Jacobs, P

机构：

[1] Univ Athens, Dept Phys, GR-10679 Athens, Greece

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

[3] Univ Birmingham, Birmingham B15 2TT, W Midlands, England

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

[5] CERN, Geneva, Switzerland

[6] Inst Phys Nucl, Krakow, Poland

[7] Gesell Schwerionenforsch Inst Darmstadt, Darmstadt, Germany

[8] Univ Calif Davis, Davis, CA 95616 USA

[9] Joint Inst Nucl Res, Dubna, Russia

[10] Univ Frankfurt, Fachbereich Phys, Frankfurt, Germany

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

[12] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[13] Univ Marburg, Fachbereich Phys, Marburg, Germany

[14] Max Planck Inst Phys, D-80805 Munich, Germany

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

[16] Univ Warsaw, Inst Phys Expt, PL-00325 Warsaw, Poland

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

[18] Yale Univ, New Haven, CT 06520 USA

[19] Rudjer Boskovic Inst, Zagreb, Croatia

来源：

PHYSICS LETTERS B | 1998年 / 444卷 / 3-4期

基金：

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

关键词：

D O I：

10.1016/S0370-2693(98)01399-9

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report measurements of Xi(-) and (Xi)over-bar(+) hyperon absolute yields as a function of rapidity in 158 GeV/c Ph + Pb collisions. At midrapidity, dN/dy = 2.29 +/- 0 12 for Xi(-), and 0.52 +/- 0.05 for (Xi)over-bar(+), leading to the ratio of (Xi)over-bar(+)/Xi(-) = 0.23 +/- 0.03. Inverse slope parameters fitted to the measured transverse mass spectra are of the order of T approximate to 300 MeV near mid-rapidity. The estimated total yield of Xi(-) particles in Pb+ Pb central interactions amounts to 7.4 +/- 1.0 per collision. Comparison to Xi(-) production in properly scaled p + p reactions at the same energy reveals a dramatic enhancement (about one order of magnitude) of Xi(-) production in Pb + Pb central collisions over elementary hadron interactions. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：523 / 530

页数：8

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