Energy dependence of particle ratio fluctuations in central Pb plus Pb collisions from √SNN=6.3 to 17.3 GeV

被引：75

作者：

Alt, C. ^{[1
]}

Anticic, T. ^{[21
]}

Baatar, B. ^{[9
]}

Barna, D. ^{[5
]}

Bartke, J. ^{[7
]}

Betev, L. ^{[10
]}

Bialkowska, H. ^{[19
]}

Blume, C. ^{[1
]}

Boimska, B. ^{[19
]}

Botje, M. ^{[2
]}

Bracinik, J. ^{[4
]}

Bramm, R. ^{[1
]}

Bunccic, P. ^{[10
]}

Cerny, V. ^{[4
]}

Christakoglou, P. ^{[2
]}

Chvala, O. ^{[14
]}

Cramer, J. G. ^{[16
]}

Csato, P. ^{[5
]}

Dinkelaker, P. ^{[1
]}

Eckardt, V. ^{[13
]}

Flierl, D. ^{[1
]}

Fodor, Z. ^{[5
]}

Foka, P. ^{[8
]}

Friese, V. ^{[8
]}

Gal, J. ^{[5
]}

Gazdzicki, M. ^{[1
,11
]}

Genchev, V. ^{[18
]}

Georgopoulos, G. ^{[3
]}

Gladysz, E. ^{[7
]}

Grebieszkow, K. ^{[20
]}

Hegyi, S. ^{[5
]}

Hoehne, C. ^{[8
]}

Kadija, K. ^{[21
]}

Karev, A. ^{[13
]}

Kliemant, M. ^{[1
]}

Kniege, S. ^{[1
]}

Kolesnikov, V. I. ^{[9
]}

Kornas, E. ^{[7
]}

Korus, R. ^{[11
]}

Kowalski, M. ^{[7
]}

Kraus, I. ^{[8
]}

Kreps, M. ^{[4
]}

Kresan, D. ^{[8
]}

van Leeuwen, M. ^{[2
]}

Levai, P. ^{[5
]}

Litov, L. ^{[17
]}

Lungwitz, B. ^{[1
]}

Makariev, M. ^{[17
]}

Malakhov, A. I. ^{[9
]}

Mateev, M. ^{[17
]}

机构：

[1] Goethe Univ Frankfurt, Fachbereich Phys, Frankfurt, Germany

[2] Nikhef, Amsterdam, Netherlands

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

[4] Comenius Univ, Bratislava, Slovakia

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

[6] MIT, Cambridge, MA 02139 USA

[7] Inst Nucl Phys, Krakow, Poland

[8] Gesell Schwerionenforsch GSI, Darmstadt, Germany

[9] Joint Inst Nucl Res, Dubna, Russia

[10] CERN, Geneva, Switzerland

[11] Jan Kochanowski Univ Humanities & Sci, Inst Phys, Kielce, Poland

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

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

[14] Charles Univ Prague, Inst Particle & Nucl Phys, Prague, Czech Republic

[15] Pusan Natl Univ, Dept Phys, Pusan 609735, South Korea

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

[17] Sofia Univ St Kliment Ohridski, Dept Atom Phys, Sofia, Bulgaria

[18] Bulgarian Acad Sci, Inst Nucl Res & Nucl Energy, Sofia, Bulgaria

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

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

[21] Rudjer Boskovic Inst, Zagreb, Croatia

[22] Polish Acad Sci, Henryk Niewodniczanski Inst Nucl Phys, Krakow, Poland

来源：

PHYSICAL REVIEW C | 2009年 / 79卷 / 04期

基金：

美国国家科学基金会;

关键词：

DECONFINEMENT PHASE-TRANSITION; BY-EVENT FLUCTUATIONS; QUARK-GLUON PLASMA; NUCLEUS; STRANGENESS; PERSPECTIVE; MATTER;

D O I：

10.1103/PhysRevC.79.044910

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：

We present measurements of the energy dependence of event-by-event fluctuations in the K/pi and (p + (p) over bar)/pi multiplicity ratios in heavy-ion collisions at the CERN SPS. The particle ratio fluctuations were obtained for central Pb + Pb collisions at five collision energies, root(S)(NN), between 6.3 and 17.3 GeV. After accounting for the effects of finite-number statistics and detector resolution, we extract the strength of nonstatistical fluctuations at each energy. For the K/pi ratio, larger fluctuations than expected for independent particle production are found at all collision energies. The fluctuations in the (p + (p) over bar)/pi ratio are smaller than expectations from independent particle production, indicating correlated pion and proton production from resonance decays. For both ratios, the deviation from purely statistical fluctuations shows an increase toward lower collision energies. The results are compared to transport model calculations, which fail to describe the energy dependence of the K/pi ratio fluctuations.

引用

页数：11

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