Energy dependence of kaon-to-proton ratio fluctuations in central Pb plus Pb collisions from √sNN=6.3 to 17.3 GeV

被引：26

作者：

Anticic, T. ^{[1
]}

Baatar, B. ^{[9
]}

Barna, D. ^{[5
]}

Bartke, J. ^{[7
]}

Beck, H. ^{[10
]}

Betev, L. ^{[11
]}

Bialkowska, H. ^{[20
]}

Blume, C. ^{[10
]}

Bogusz, M. ^{[22
]}

Boimska, B. ^{[20
]}

Book, J. ^{[10
]}

Botje, M. ^{[2
]}

Buncic, P. ^{[11
]}

Cetner, T. ^{[22
]}

Christakoglou, P. ^{[2
]}

Chung, P. ^{[19
]}

Chvala, O. ^{[15
]}

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

Eckardt, V. ^{[14
]}

Fodor, Z. ^{[5
]}

Foka, P. ^{[8
]}

Friese, V. ^{[8
]}

Gazdzicki, M. ^{[10
,12
]}

Grebieszkow, K. ^{[22
]}

Hoehne, C. ^{[8
]}

Kadija, K. ^{[1
]}

Karev, A. ^{[11
]}

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

Kollegger, T. ^{[10
]}

Kowalski, M. ^{[7
]}

Kresan, D. ^{[8
]}

Laszlo, A. ^{[5
]}

Lacey, R. ^{[19
]}

van Leeuwen, M. ^{[2
]}

Mackowiak, M. ^{[22
]}

Makariev, M. ^{[18
]}

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

Mateev, M. ^{[17
]}

Melkumov, G. L. ^{[9
]}

Mitrovski, M. ^{[10
]}

Mrowczynski, St. ^{[12
]}

Nicolic, V. ^{[1
]}

Palla, G. ^{[5
]}

Panagiotou, A. D. ^{[3
]}

Peryt, W. ^{[22
]}

Pluta, J. ^{[22
]}

Prindle, D. ^{[16
]}

Puehlhofer, F. ^{[13
]}

Renfordt, R. ^{[10
]}

Roland, C. ^{[6
]}

机构：

[1] Rudjer Boskovic Inst, Zagreb, Croatia

[2] NIKHEF, Amsterdam, Netherlands

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

[4] Eotvos Lorand Univ, Budapest, Hungary

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

[6] MIT, Cambridge, MA 02139 USA

[7] Polish Acad Sci, H Niewodniczanski Inst Nucl Phys, Krakow, Poland

[8] Gesell Schwerionenforsch GSI, Darmstadt, Germany

[9] Joint Inst Nucl Res, Dubna, Russia

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

[11] CERN, Geneva, Switzerland

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

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

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

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

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

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

[18] BAS, Inst Nucl Res & Nucl Energy, Sofia, Bulgaria

[19] SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA

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

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

[22] Warsaw Univ Technol, Fac Phys, Warsaw, Poland

来源：

PHYSICAL REVIEW C | 2011年 / 83卷 / 06期

关键词：

D O I：

10.1103/PhysRevC.83.061902

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：

Kaons and protons carry large parts of two conserved quantities: strangeness and baryon number. It is argued that their correlation and thus also fluctuations are sensitive to conditions prevailing at the anticipated parton- hadron phase boundary. Fluctuations of the (K+ + K-)/(p + (p) over bar) and K+/p ratios have been measured for the first time by NA49 in central Pb + Pb collisions at five CERN Super Proton Synchrotron energies between root s(NN) = 6.3 and root s(NN) = 17.3 GeV. Both ratios exhibit a change of sign in sigma(dyn), a measure of nonstatistical fluctuations, around root s(NN) = 8 GeV. Below this energy, sdyn is positive, indicating higher fluctuation compared to a mixed event background sample, while for higher energies, sigma(dyn) is negative, indicating correlated emission of kaons and protons. The results are compared to hadronic transport model calculations which fail to reproduce the energy dependence.

引用

页数：5

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