Pion, Kaon, and Proton Production in Central Pb-Pb Collisions at √sNN=2.76 TeV

被引：129

作者：

Abelev, B. ^{[1
]}

Adam, J. ^{[2
]}

Adamova, D. ^{[3
]}

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

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

Rinella, G. Aglieri ^{[6
]}

Agocs, A. G. ^{[7
]}

Agostinelli, A. ^{[8
,9
]}

Aguilar Salazar, S. ^{[10
]}

Ahammed, Z. ^{[11
]}

Ahmad, N. ^{[12
]}

Masoodi, A. Ahmad ^{[12
]}

Ahn, S. A. ^{[13
]}

Ahn, S. U. ^{[14
]}

Akindinov, A. ^{[15
]}

Aleksandrov, D. ^{[16
]}

Alessandro, B. ^{[17
]}

Alfaro Molina, R. ^{[10
]}

Alici, A. ^{[9
,18
,19
]}

Alkin, A. ^{[20
]}

Almaraz Avina, E. ^{[10
]}

Alme, J. ^{[21
]}

Alt, T. ^{[22
]}

Altini, V. ^{[23
,24
]}

Altinpinar, S. ^{[25
]}

Altsybeev, I. ^{[26
]}

Andrei, C. ^{[27
]}

Andronic, A. ^{[28
,29
]}

Anguelov, V. ^{[30
]}

Anielski, J. ^{[31
]}

Anson, C. ^{[32
]}

Anticic, T. ^{[33
]}

Antinori, F. ^{[34
]}

Antonioli, P. ^{[9
]}

Aphecetche, L. ^{[35
]}

Appelshaeuser, H. ^{[36
]}

Arbor, N. ^{[37
]}

Arcelli, S. ^{[8
,9
]}

Arend, A. ^{[36
]}

Armesto, N. ^{[38
,39
]}

Arnaldi, R. ^{[17
]}

Aronsson, T. ^{[4
]}

Arsene, I. C. ^{[28
,29
]}

Arslandok, M. ^{[36
]}

Asryan, A. ^{[26
]}

Augustinus, A. ^{[6
]}

Averbeck, R. ^{[28
,29
]}

Awes, T. C. ^{[40
]}

Aysto, J. ^{[41
,42
]}

Azmi, M. D. ^{[12
,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, CZ-25068 Rez, Czech Republic

[4] Yale Univ, New Haven, CT USA

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

[6] European Org Nucl Res CERN, Geneva, Switzerland

[7] Hungarian Acad Sci, KFKI Res Inst Particle & Nucl Phys, Budapest, Hungary

[8] Univ Bologna, Dipartimento Fis, Bologna, Italy

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

[10] Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico

[11] Ctr Variable Energy Cyclotron, Kolkata, India

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

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

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

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

[16] IV Kurchatov Atom Energy Inst, Russian Res Ctr, Moscow 123182, Russia

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

[18] Ctr Studi & Ric, Ctr Fermi, Rome, Italy

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

[20] Bogolyubov Inst Theoret Phys, Kiev, Ukraine

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

[22] Goethe Univ Frankfurt, Frankfurt Inst Adv Studies, Frankfurt, Germany

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

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

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

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

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

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

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

[30] Heidelberg Univ, Inst Phys, D-6900 Heidelberg, Germany

[31] Univ Munster, Inst Kernphys, D-4400 Munster, Germany

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

[33] Rudjer Boskovic Inst, Zagreb, Croatia

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

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

[36] Goethe Univ Frankfurt, Inst Kernphys, D-6000 Frankfurt, Germany

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

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

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

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

[41] Univ Jyvaskyla, Jyvaskyla, Finland

[42] Helsinki Inst Phys, Jyvaskyla, Finland

[43] Univ Cape Town, Dept Phys, iThemba LABS, 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] CEA, IRFU, Saclay, France

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

[48] Inst Phys, Bhubaneswar 751007, Orissa, India

[49] Univ Catania, Dipartimento Fis & Astron, Catania, Italy

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

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 25期

基金：

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

关键词：

TOTAL CROSS-SECTIONS; QUARK-GLUON PLASMA; HADRON-PRODUCTION; MONTE-CARLO; FREEZE-OUT; QCD; SPECTRUM;

D O I：

10.1103/PhysRevLett.109.252301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In this Letter we report the first results on pi(+/-), K-+/-, p, and (p) over bar production at midrapidity (vertical bar y vertical bar < 0.5) in central Pb-Pb collisions at root s(NN) = 2.76 TeV, measured by the ALICE experiment at the LHC. The p(T) distributions and yields are compared to previous results at root s(NN) = 200 GeV and expectations from hydrodynamic and thermal models. The spectral shapes indicate a strong increase of the radial flow velocity with root s(NN), which in hydrodynamic models is expected as a consequence of the increasing particle density. While the K/pi ratio is in line with predictions from the thermal model, the p/pi ratio is found to be lower by a factor of about 1.5. This deviation from thermal model expectations is still to be understood.

引用

页数：11

共 51 条

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