Space-time evolution of the hadronic source in peripheral to central Pb plus Pb collisions

被引：15

作者：

Bearden, IG

Boggild, H

Boissevain, J

Christiansen, PHL

Conin, L

Dodd, J

Erazmus, B

Esumi, S

Fabjan, CW

Ferenc, D

Franz, A

Gaardhoje, JJ

Hansen, AG

Hansen, O

Hardtke, D

van Hecke, H

Holzer, EB

Humanic, TJ

Hummel, P

Jacak, BV

Kaimi, K

Kaneta, M

Kohama, T

Kopytine, M

Leltchouk, M

Ljubicic, A

Lörstad, B

Maeda, N

Martin, L

Medvedev, A

Murray, M

Ohnishi, H

Paic, G

Pandey, SU

Piuz, F

Pluta, J

Polychronakos, V

Potekhin, M

Poulard, G

Reichhold, D

Sakaguchi, A

Schmidt-Sorensen, J

Simon-Gillo, J

Sondheim, W

Sugitate, T

Sullivan, JP

Sumi, Y

Willis, WJ

Wolf, K

Xu, N

机构：

[1] Niels Bohr Inst, DK-2100 Copenhagen, Denmark

[2] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[3] Columbia Univ, Dept Phys, New York, NY 10027 USA

[4] Nucl Phys Lab Nantes, F-44072 Nantes, France

[5] Hiroshima Univ, Higashihiroshima 7398526, Japan

[6] CERN, CH-1211 Geneva 23, Switzerland

[7] Rudjer Boskovic Inst, Zagreb, Croatia

[8] Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA

[9] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[10] SUNY Stony Brook, Stony Brook, NY 11973 USA

[11] Lund Univ, Dept Phys, S-22362 Lund, Sweden

[12] Brookhaven Natl Lab, Upton, NY 11973 USA

来源：

EUROPEAN PHYSICAL JOURNAL C | 2000年 / 18卷 / 02期

关键词：

D O I：

10.1007/s100520000543

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

Two-particle correlations of negative pions as a function of charged particle multiplicity are studied in Pb+Pb collisions at roots = 17.3GeV per nucleon using the NA44 experiment at the CERN Super Proton Synchrotron(SPS). We find that the source size parameters increase with the charged particle multiplicity. However the slope of the: source size parameters plotted as a function of charged multiplicity is slightly larger at high multiplicity than at low multiplicity. The value of lambda is independent of charged multiplicity. For Pb+Pb collisions, R-L is larger than R-TS and R-TO for all multiplicity intervals, whereas these three radius parameters were approximately equal in S+Nucleus collisions. The ratios (R-L/R-TS) and (R-L/R-TO) for Pb+Pb data show almost no dependence on charged multiplicity. The duration of pion emission Delta tau is constant at 3.8+/-1.1 fm/c as a function of the charged multiplicity in Pb+Pb collisions. Effective volume (V) is also calculated as V=pi x R-TS(2) x R-L; assuming a cylindrically shaped source. We found, within the limited statistics, the effective Volume rapidly increases at high multiplicity.

引用

页码：317 / 325

页数：9

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