KS0 and Λ Production in Pb-Pb Collisions at √sNN=2: 76 TeV

被引：271

作者：

Abelev, B. ^{[1
]}

Adam, J. ^{[2
]}

Adamova, D. ^{[3
]}

Adare, A. M. ^{[4
]}

Aggarwal, M. M. ^{[5
]}

Rinella, G. Aglieri ^{[6
]}

Agnello, M. ^{[7
,8
]}

Agocs, A. G. ^{[9
]}

Agostinelli, A. ^{[10
,11
]}

Ahammed, Z. ^{[12
]}

Ahmad, N. ^{[13
]}

Masoodi, A. Ahmad ^{[13
]}

Ahmed, I. ^{[14
]}

Ahn, S. U. ^{[15
]}

Ahn, S. A. ^{[15
]}

Aimo, I. ^{[7
,8
]}

Aiola, S. ^{[4
]}

Ajaz, M. ^{[14
]}

Akindinov, A. ^{[16
]}

Aleksandrov, D. ^{[17
]}

Alessandro, B. ^{[8
]}

Alexandre, D. ^{[18
]}

Alici, A. ^{[19
,20
,21
]}

Alkin, A. ^{[22
]}

Alme, J. ^{[23
]}

Alt, T. ^{[24
]}

Altini, V. ^{[25
,26
]}

Altinpinar, S. ^{[27
]}

Altsybeev, I. ^{[28
]}

Alves Garcia Prado, C. ^{[29
]}

Andrei, C. ^{[30
]}

Andronic, A. ^{[31
,32
]}

Anguelov, V. ^{[33
]}

Anielski, J. ^{[34
]}

Anticic, T. ^{[35
]}

Antinori, F. ^{[36
]}

Antonioli, P. ^{[21
]}

Aphecetche, L. ^{[37
]}

Appelshaeuser, H. ^{[38
]}

Arbor, N. ^{[39
]}

Arcelli, S. ^{[10
,11
]}

Armesto, N. ^{[40
,41
]}

Arnaldi, R. ^{[8
]}

Aronsson, T. ^{[4
]}

Arsene, I. C. ^{[31
,32
]}

Arslandok, M. ^{[38
]}

Augustinus, A. ^{[6
]}

Averbeck, R. ^{[31
,32
]}

Awes, T. C. ^{[42
]}

Azmi, M. D. ^{[43
]}

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA USA

[2] Czech Tech Univ, Fac Nucl Sci & Phys Engn, CR-11519 Prague, Czech Republic

[3] Acad Sci Czech Republ, Inst Nucl Phys, Prague, Czech Republic

[4] Yale Univ, New Haven, CT USA

[5] Panjab Univ, Dept Phys, Chandigarh 160014, India

[6] CERN, European Org Nucl Res, CH-1211 Geneva, Switzerland

[7] Politecn Torino, Turin, Italy

[8] Sezione Ist Nazl Fis Nucl, Turin, Italy

[9] Hungarian Acad Sci, Wigner Res Ctr Phys, Budapest, Hungary

[10] Univ Bologna, Dipartimento Fis & Astron, Bologna, Italy

[11] Sezione Ist Nazl Fis Nucl, Bologna, Italy

[12] Ctr Variable Energy Cyclotron, Kolkata, India

[13] Aligarh Muslim Univ, Dept Phys, Aligarh 202002, Uttar Pradesh, India

[14] CIIT Ctr Hlth Res, Islamabad, Pakistan

[15] Korea Inst Sci & Technol Informat, Taejon, South Korea

[16] Inst Theoret & Expt Phys, Moscow 117259, Russia

[17] Russian Res Ctr, Kurchatov Inst, Moscow, Russia

[18] Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands, England

[19] Ctr Fermi Museo Stor Fis, Rome, Italy

[20] Ctr Studi & Ric Enrico Fermi, Rome, Italy

[21] Sezione Ist Nazl Fis Nucl, Bologna, Italy

[22] Bogolyubov Inst Theoret Phys, Kiev, Ukraine

[23] Bergen Univ Coll, Fac Engn, Bergen, Norway

[24] Goethe Univ Frankfurt, Frankfurt Inst Adv Studies, D-60054 Frankfurt, Germany

[25] Dipartimento Interateneo Fis M Merlin, Bari, Italy

[26] Sezione Ist Nazl Fis Nucl, Bari, Italy

[27] Univ Bergen, Dept Phys & Technol, Bergen, Norway

[28] St Petersburg State Univ, V Fock Inst Phys, St Petersburg 199034, Russia

[29] Univ Sao Paulo, Sao Paulo, Brazil

[30] Natl Inst Phys & Nucl Engn, Bucharest, Romania

[31] GSI Helmholtzzentrum Schwerionenforsch, Div Res, Darmstadt, Germany

[32] GSI Helmholtzzentrum Schwerionenforsch, ExtreMe Matter Inst EMMI, Darmstadt, Germany

[33] Heidelberg Univ, Inst Phys, Heidelberg, Germany

[34] Univ Munster, Inst Kernphys, D-48149 Munster, Germany

[35] Rudjer Boskovic Inst, Zagreb, Croatia

[36] Sezione Ist Nazl Fis Nucl, Padua, Italy

[37] Univ Nantes, SUBATECH, Ecole Mines Nantes, CNRS,IN2P3, Nantes, France

[38] Goethe Univ Frankfurt, Inst Kernphys, Frankfurt, Germany

[39] Univ Grenoble 1, LPSC, CNRS IN2P3, Inst Polytech Grenoble, Grenoble, France

[40] Univ Santiago de Compostela, Dept Fis Particulas, Santiago De Compostela, Spain

[41] Univ Santiago de Compostela, IGFAE, Santiago De Compostela, Spain

[42] Oak Ridge Natl Lab, Oak Ridge, TN USA

[43] Univ Cape Town, Dept Phys, ZA-7925 Cape Town, South Africa

[44] Sezione Ist Nazl Fis Nucl, Catania, Italy

[45] Univ Blaise Pascal, Clermont Univ, LPC, CNRS IN2P3, Clermont Ferrand, France

[46] Gangneung Wonju Natl Univ, Kangnung, South Korea

[47] Univ Rajasthan, Dept Phys, Jaipur 302004, Rajasthan, India

[48] Univ Jammu, Dept Phys, Jammu 180004, India

[49] IRFU, Commissariat Energie Atom, Saclay, France

[50] Slovak Acad Sci, Inst Expt Phys, Kosice 04353, Slovakia

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 22期

基金：

美国国家科学基金会; 巴西圣保罗研究基金会; 新加坡国家研究基金会; 芬兰科学院; 瑞典研究理事会; 美国能源部; 俄罗斯基础研究基金会; 欧洲研究理事会; 英国科学技术设施理事会; 中国国家自然科学基金;

关键词：

PARTICLE-PRODUCTION;

D O I：

10.1103/PhysRevLett.111.222301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The ALICE measurement of K-S(0) and Lambda production at midrapidity in Pb-Pb collisions at root sNN = 2.76 TeV is presented. The transverse momentum (p(T)) spectra are shown for several collision centrality intervals and in the p(T) range from 0: 4 GeV/c (0: 6 GeV/c for Lambda) to 12 GeV/c. The p(T) dependence of the Lambda/K-S(0) ratios exhibits maxima in the vicinity of 3 GeV/c, and the positions of the maxima shift towards higher p(T) with increasing collision centrality. The magnitude of these maxima increases by almost a factor of three between most peripheral and most central Pb-Pb collisions. This baryon excess at intermediate p(T) is not observed in pp interactions at root s = 0.9 TeV and at root s = 7 TeV. Qualitatively, the baryon enhancement in heavy-ion collisions is expected from radial flow. However, the measured p(T) spectra above 2 GeV/c progressively decouple from hydrodynamical-model calculations. For higher values of p(T), models that incorporate the influence of the medium on the fragmentation and hadronization processes describe qualitatively the p(T) dependence of the Lambda/K-S(0) ratio.

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页数：10

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