Directed Flow of Charged Particles at Midrapidity Relative to the Spectator Plane in Pb-Pb Collisions at √sNN=2.76TeV

被引:67
作者
Abelev, B. [1 ]
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 ,111 ,118 ]
Ahammed, Z. [11 ]
Ahmad, N. [12 ]
Masoodi, A. Ahmad [12 ]
Ahmed, I. [13 ]
Ahn, S. A. [14 ]
Ahn, S. U. [14 ]
Aimo, I. [7 ,8 ,15 ]
Ajaz, M. [13 ]
Akindinov, A. [16 ]
Aleksandrov, D. [17 ]
Alessandro, B. [7 ]
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 ]
Andrei, C. [28 ]
Andronic, A. [30 ,31 ]
Anguelov, V. [32 ]
Anielski, J. [33 ]
Anson, C. [34 ]
Anticic, T. [35 ]
Antinori, F. [36 ]
Antonioli, P. [19 ]
Aphecetche, L. [37 ]
Appelshaeuser, H. [38 ]
Arbor, N. [39 ]
Arcelli, S. [10 ]
Arend, A. [38 ]
Armesto, N. [40 ,41 ]
Arnaldi, R. [7 ]
Aronsson, T. [4 ]
Arsene, I. C. [30 ,31 ]
Arslandok, M. [38 ]
Asryan, A. [28 ]
Augustinus, A. [6 ]
Averbeck, R. [30 ,31 ]
机构
[1] Lawrence Livermore Natl Lab, Livermore, CA 94550 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] Sezione Ist Nazl Fis Nucl, Turin, Italy
[8] Politecn Torino, Turin, Italy
[9] Hungarian Acad Sci, Wigner Res Ctr Phys, Budapest, Hungary
[10] Univ & Sez INFN, Dipartimento Fis & Astron, Bologna, Italy
[11] Ctr Variable Energy Cyclotron, Kolkata, India
[12] Aligarh Muslim Univ, Dept Phys, Aligarh 202002, Uttar Pradesh, India
[13] COMSATS Inst Informat Technol CIIT, Islamabad, Pakistan
[14] Korea Inst Sci & Technol Informat, Taejon, South Korea
[15] Univ & Sez INFN, Dipartimento Fis, Turin, Italy
[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] Sezione Ist Nazl Fis Nucl, Bologna, Italy
[20] Ctr Fermi Museo Storico Fis, Rome, Italy
[21] Ctr Ric Enrico Fermi, Rome, 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] Natl Inst Phys & Nucl Engn, Bucharest, Romania
[30] GSI Helmholtzzentrum Schwerionenforsch, Div Res, Darmstadt, Germany
[31] GSI Helmholtzzentrum Schwerionenforsch, EMMI, Darmstadt, Germany
[32] Heidelberg Univ, Inst Phys, Heidelberg, Germany
[33] Univ Munster, Inst Kernphys, D-48149 Munster, Germany
[34] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA
[35] Rudjer Boskovic Inst, Zagreb, Croatia
[36] Sezione Ist Nazl Fis Nucl, Padua, Italy
[37] Univ Nantes, CNRS IN2P3, Ecole Mines Nantes, SUBATECH, Nantes, France
[38] Goethe Univ Frankfurt, Inst Kernphys, D-60054 Frankfurt, Germany
[39] Univ Grenoble 1, CNRS IN2P3, Inst Polytech Grenoble, LPSC, Grenoble, France
[40] Univ Santiago Compostela, Dept Fis Particulas, Santiago De Compostela, Spain
[41] Univ Santiago Compostela, IGFAE, Santiago De Compostela, Spain
[42] Oak Ridge Natl Lab, Oak Ridge, TN USA
[43] HIP, Jyvaskyla, Finland
[44] Univ Jyvaskyla, Jyvaskyla, Finland
[45] Univ Cape Town, Dept Phys, Somerset West, South Africa
[46] Natl Res Fdn, iThemba LABS, Somerset West, South Africa
[47] Sezione Ist Nazl Fis Nucl, Catanzaro, Italy
[48] Univ Blaise Pascal, Univ Clermont, LPC, CNRS IN2P3, Clermont Ferrand, France
[49] Gangneung Wonju Natl Univ, Kangnung, South Korea
[50] Univ Jammu, Dept Phys, Jammu 180004, India
基金
中国国家自然科学基金; 巴西圣保罗研究基金会; 美国国家科学基金会; 新加坡国家研究基金会; 欧洲研究理事会; 芬兰科学院;
关键词
ELLIPTIC FLOW; COLLECTIVE FLOW;
D O I
10.1103/PhysRevLett.111.232302
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The directed flow of charged particles at midrapidity is measured in Pb-Pb collisions at root s(NN) p 2: 76 TeV relative to the collision symmetry plane defined by the spectator nucleons. A negative slope of the rapidity-odd directed flow component with approximately 3 times smaller magnitude than found at the highest RHIC energy is observed. This suggests a smaller longitudinal tilt of the initial system and disfavors the strong fireball rotation predicted for the LHC energies. The rapidity-even directed flow component is measured for the first time with spectators and found to be independent of pseudorapidity with a sign change at transverse momenta p(T) between 1.2 and 1: 7 GeV/c. Combined with the observation of a vanishing rapidity-even p(T) shift along the spectator deflection this is strong evidence for dipolelike initial density fluctuations in the overlap zone of the nuclei. Similar trends in the rapidity-even directed flow and the estimate from two-particle correlations at midrapidity, which is larger by about a factor of 40, indicate a weak correlation between fluctuating participant and spectator symmetry planes. These observations open new possibilities for investigation of the initial conditions in heavy-ion collisions with spectator nucleons.
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页数:11
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共 52 条
[1]   Measurement of the azimuthal anisotropy for charged particle production in √sNN=2.76 TeV lead-lead collisions with the ATLAS detector [J].
Aad, G. ;
Abbott, B. ;
Abdallah, J. ;
Khalek, S. Abdel ;
Abdelalim, A. A. ;
Abdesselam, A. ;
Abdinov, O. ;
Abi, B. ;
Abolins, M. ;
AbouZeid, O. S. ;
Abramowicz, H. ;
Abreu, H. ;
Acerbi, E. ;
Acharya, B. S. ;
Adamczyk, L. ;
Adams, D. L. ;
Addy, T. N. ;
Adelman, J. ;
Aderholz, M. ;
Adomeit, S. ;
Adragna, P. ;
Adye, T. ;
Aefsky, S. ;
Aguilar-Saavedra, J. A. ;
Aharrouche, M. ;
Ahlen, S. P. ;
Ahles, F. ;
Ahmad, A. ;
Ahsan, M. ;
Aielli, G. ;
Akdogan, T. ;
Akesson, T. P. A. ;
Akimoto, G. ;
Akimov, A. V. ;
Akiyama, A. ;
Alam, M. S. ;
Alam, M. A. ;
Albert, J. ;
Albrand, S. ;
Aleksa, M. ;
Aleksandrov, I. N. ;
Alessandria, F. ;
Alexa, C. ;
Alexander, G. ;
Alexandre, G. ;
Alexopoulos, T. ;
Alhroob, M. ;
Aliev, M. ;
Alimonti, G. ;
Alison, J. .
PHYSICAL REVIEW C, 2012, 86 (01) :014907-1
[2]   Harmonic decomposition of two particle angular correlations in Pb-Pb collisions at √sNN=2.76 TeV [J].
Aamodt, K. ;
Abelev, B. ;
Abrahantes Quintana, A. ;
Adamova, D. ;
Adare, A. M. ;
Aggarwal, M. M. ;
Rinella, G. Aglieri ;
Agocs, A. G. ;
Agostinelli, A. ;
Aguilar Salazar, S. ;
Ahammed, Z. ;
Ahmad, N. ;
Masoodi, A. Ahmad ;
Ahn, S. U. ;
Akindinov, A. ;
Aleksandrov, D. ;
Alessandro, B. ;
Molina, R. Alfaro ;
Alici, A. ;
Alkin, A. ;
Almaraz Avina, E. ;
Alme, J. ;
Alt, T. ;
Altini, V. ;
Altinpinar, S. ;
Altsybeev, I. ;
Andrei, C. ;
Andronic, A. ;
Anguelov, V. ;
Anielski, J. ;
Anticic, T. ;
Antinori, F. ;
Antonioli, P. ;
Aphecetche, L. ;
Appelshaeuser, H. ;
Arbor, N. ;
Arcelli, S. ;
Arend, A. ;
Armesto, N. ;
Arnaldi, R. ;
Aronsson, T. ;
Arsene, I. C. ;
Arslandok, M. ;
Asryan, A. ;
Augustinus, A. ;
Averbeck, R. ;
Awes, T. C. ;
Aysto, J. ;
Azmi, M. D. ;
Bach, M. .
PHYSICS LETTERS B, 2012, 708 (3-5) :249-264
[3]   Higher Harmonic Anisotropic Flow Measurements of Charged Particles in Pb-Pb Collisions at √sNN=2.76 TeV [J].
Aamodt, K. ;
Abelev, B. ;
Abrahantes Quintana, A. ;
Adamova, D. ;
Adare, A. M. ;
Aggarwal, M. M. ;
Rinella, G. Aglieri ;
Agocs, A. G. ;
Agostinelli, A. ;
Aguilar Salazar, S. ;
Ahammed, Z. ;
Ahmad, N. ;
Masoodi, A. Ahmad ;
Ahn, S. U. ;
Akindinov, A. ;
Aleksandrov, D. ;
Alessandro, B. ;
Alfaro Molina, R. ;
Alici, A. ;
Alkin, A. ;
Almaraz Avina, E. ;
Alt, T. ;
Altini, V. ;
Altsybeev, I. ;
Andrei, C. ;
Andronic, A. ;
Anguelov, V. ;
Anson, C. ;
Anticic, T. ;
Antinori, F. ;
Antonioli, P. ;
Aphecetche, L. ;
Appelshaeuser, H. ;
Arbor, N. ;
Arcelli, S. ;
Arend, A. ;
Armesto, N. ;
Arnaldi, R. ;
Aronsson, T. ;
Arsene, I. C. ;
Arslandok, M. ;
Asryan, A. ;
Augustinus, A. ;
Averbeck, R. ;
Awes, T. C. ;
Aysto, J. ;
Azmi, M. D. ;
Bach, M. ;
Badala, A. ;
Baek, Y. W. .
PHYSICAL REVIEW LETTERS, 2011, 107 (03)
[4]   Elliptic Flow of Charged Particles in Pb-Pb Collisions at √sNN=2.76 TeV [J].
Aamodt, K. ;
Abelev, B. ;
Abrahantes Quintana, A. ;
Adamova, D. ;
Adare, A. M. ;
Aggarwal, M. M. ;
Rinella, G. Aglieri ;
Agocs, A. G. ;
Aguilar Salazar, S. ;
Ahammed, Z. ;
Masoodi, A. Ahmad ;
Ahmad, N. ;
Ahn, S. U. ;
Akindinov, A. ;
Aleksandrov, D. ;
Alessandro, B. ;
Alfaro Molina, R. ;
Alici, A. ;
Alkin, A. ;
Almaraz Avina, E. ;
Alt, T. ;
Altini, V. ;
Altinpinar, S. ;
Altsybeev, I. ;
Andrei, C. ;
Andronic, A. ;
Anguelov, V. ;
Anson, C. ;
Anticic, T. ;
Antinori, F. ;
Antonioli, P. ;
Aphecetche, L. ;
H. Appelshaeuser ;
Arbor, N. ;
Arcelli, S. ;
Arend, A. ;
Armesto, N. ;
Arnaldi, R. ;
Aronsson, T. ;
Arsene, I. C. ;
Asryan, A. ;
Augustinus, A. ;
Averbeck, R. ;
Awes, T. C. ;
Aysto, J. ;
Azmi, M. D. ;
Bach, M. ;
Badala, A. ;
Baek, Y. W. ;
Bagnasco, S. .
PHYSICAL REVIEW LETTERS, 2010, 105 (25)
[5]   The ALICE experiment at the CERN LHC [J].
Aamodt, K. ;
Quintana, A. Abrahantes ;
Achenbach, R. ;
Acounis, S. ;
Adamova, D. ;
Adler, C. ;
Aggarwal, M. ;
Agnese, F. ;
Rinella, G. Aglieri ;
Ahammed, Z. ;
Ahmad, A. ;
Ahmad, N. ;
Ahmad, S. ;
Akindinov, A. ;
Akishin, P. ;
Aleksandrov, D. ;
Alessandro, B. ;
Alfaro, R. ;
Alfarone, G. ;
Alici, A. ;
Alme, J. ;
Alt, T. ;
Altinpinar, S. ;
Amend, W. ;
Andrei, C. ;
Andres, Y. ;
Andronic, A. ;
Anelli, G. ;
Anfreville, M. ;
Angelov, V. ;
Anzo, A. ;
Anson, C. ;
Anticic, T. ;
Antonenko, V. ;
Antonczyk, D. ;
Antinori, F. ;
Antinori, S. ;
Antonioli, P. ;
Aphecetche, L. ;
Appelshaeuser, H. ;
Aprodu, V. ;
Arba, M. ;
Arcelli, S. ;
Argentieri, A. ;
Armesto, N. ;
Arnaldi, R. ;
Arefiev, A. ;
Arsene, I. ;
Asryan, A. ;
Augustinus, A. .
JOURNAL OF INSTRUMENTATION, 2008, 3 (08)
[6]   Centrality determination of Pb-Pb collisions at √sNN=2.76 TeV with ALICE [J].
Abelev, B. ;
Adam, J. ;
Adamova, D. ;
Adare, A. M. ;
Aggarwal, M. M. ;
Rinella, G. Aglieri ;
Agnello, M. ;
Agocs, A. G. ;
Agostinelli, A. ;
Ahammed, Z. ;
Ahmad, N. ;
Masoodi, A. Ahmad ;
Ahn, S. U. ;
Ahn, S. A. ;
Ajaz, M. ;
Akindinov, A. ;
Aleksandrov, D. ;
Alessandro, B. ;
Alici, A. ;
Alkin, A. ;
Avina, E. Almaraz ;
Alme, J. ;
Alt, T. ;
Altini, V. ;
Altinpinar, S. ;
Altsybeev, I. ;
Andrei, C. ;
Andronic, A. ;
Anguelov, V. ;
Anielski, J. ;
Anson, C. ;
Anticic, T. ;
Antinori, F. ;
Antonioli, P. ;
Aphecetche, L. ;
Appelshaeuser, H. ;
Arbor, N. ;
Arcelli, S. ;
Arend, A. ;
Armesto, N. ;
Arnaldi, R. ;
Aronsson, T. ;
Arsene, I. C. ;
Arslandok, M. ;
Asryan, A. ;
Augustinus, A. ;
Averbeck, R. ;
Awes, T. C. ;
Aeystoe, J. ;
Azmi, M. D. .
PHYSICAL REVIEW C, 2013, 88 (04)
[7]   Charge separation relative to the reaction plane in Pb-Pb collisions at √sNN=2.76 TeV [J].
Abelev, B. ;
Adam, J. ;
Adamova, D. ;
Adare, A. M. ;
Aggarwal, M. M. ;
Rinella, G. Aglieri ;
Agocs, A. G. ;
Agostinelli, A. ;
Salazar, S. Aguilar ;
Ahammed, Z. ;
Ahmad, N. ;
Masoodi, A. Ahmad ;
Ahn, S. A. ;
Ahn, S. U. ;
Akindinov, A. ;
Aleksandrov, D. ;
Alessandro, B. ;
Molina, R. Alfaro ;
Alici, A. ;
Alkin, A. ;
Almaraz Avina, E. ;
Alme, J. ;
Alt, T. ;
Altini, V. ;
Altinpinar, S. ;
Altsybeev, I. ;
Andrei, C. ;
Andronic, A. ;
Anguelov, V. ;
Anielski, J. ;
Anson, C. ;
Anticic, T. ;
Antinori, F. ;
Antonioli, P. ;
Aphecetche, L. ;
Appelshaeuser, H. ;
Arbor, N. ;
Arcelli, S. ;
Arend, A. ;
Armesto, N. ;
Arnaldi, R. ;
Aronsson, T. ;
Arsene, I. C. ;
Arslandok, M. ;
Asryan, A. ;
Augustinus, A. ;
Averbeck, R. ;
Awes, T. C. ;
Aysto, J. ;
Azmi, M. D. .
PHYSICAL REVIEW LETTERS, 2013, 110 (01)
[8]   Measurement of the Cross Section for Electromagnetic Dissociation with Neutron Emission in Pb-Pb Collisions at √sNN=2.76 TeV [J].
Abelev, B. ;
Adam, J. ;
Adamova, D. ;
Adare, A. M. ;
Aggarwal, M. M. ;
Rinella, G. Aglieri ;
Agocs, A. G. ;
Agostinelli, A. ;
Aguilar Salazar, S. ;
Ahammed, Z. ;
Masoodi, A. Ahmad ;
Ahmad, N. ;
Ahn, S. U. ;
Akindinov, A. ;
Aleksandrov, D. ;
Alessandro, B. ;
Alfaro Molina, R. ;
Alici, A. ;
Alkin, A. ;
Almaraz Avina, E. ;
Alme, J. ;
Alt, T. ;
Altini, V. ;
Altinpinar, S. ;
Altsybeev, I. ;
Andrei, C. ;
Andronic, A. ;
Anguelov, V. ;
Anielski, J. ;
Anticic, T. ;
Antinori, F. ;
Antonioli, P. ;
Aphecetche, L. ;
Appelshaeuser, H. ;
Arbor, N. ;
Arcelli, S. ;
Arend, A. ;
Armesto, N. ;
Arnaldi, R. ;
Aronsson, T. ;
Arsene, I. C. ;
Arslandok, M. ;
Augustinus, A. ;
Averbeck, R. ;
Awes, T. C. ;
Aysto, J. ;
Azmi, M. D. ;
Bach, M. ;
Badala, A. ;
Baek, Y. W. .
PHYSICAL REVIEW LETTERS, 2012, 109 (25)
[9]   System-Size Independence of Directed Flow Measured at the BNL Relativistic Heavy-Ion Collider [J].
Abelev, B. I. ;
Aggarwal, M. M. ;
Ahammed, Z. ;
Anderson, B. D. ;
Arkhipkin, D. ;
Averichev, G. S. ;
Bai, Y. ;
Balewski, J. ;
Barannikova, O. ;
Barnby, L. S. ;
Baudot, J. ;
Baumgart, S. ;
Beavis, D. R. ;
Bellwied, R. ;
Benedosso, F. ;
Betts, R. R. ;
Bhardwaj, S. ;
Bhasin, A. ;
Bhati, A. K. ;
Bichsel, H. ;
Bielcik, J. ;
Bielcikova, J. ;
Biritz, B. ;
Bland, L. C. ;
Bombara, M. ;
Bonner, B. E. ;
Botje, M. ;
Bouchet, J. ;
Braidot, E. ;
Brandin, A. V. ;
Bueltmann, S. ;
Burton, T. P. ;
Bystersky, M. ;
Cai, X. Z. ;
Caines, H. ;
Sanchez, M. Calderon de la Barca ;
Callner, J. ;
Catu, O. ;
Cebra, D. ;
Cendejas, R. ;
Cervantes, M. C. ;
Chajecki, Z. ;
Chaloupka, P. ;
Chattopadhyay, S. ;
Chen, H. F. ;
Chen, J. H. ;
Chen, J. Y. ;
Cheng, J. ;
Cherney, M. ;
Chikanian, A. .
PHYSICAL REVIEW LETTERS, 2008, 101 (25)
[10]   Elliptic flow in Au plus Au collisions at √sNN=130 GeV [J].
Ackermann, KH ;
Adams, N ;
Adler, C ;
Ahammed, Z ;
Ahmad, S ;
Allgower, C ;
Amsbaugh, J ;
Anderson, M ;
Anderssen, E ;
Arnesen, H ;
Arnold, L ;
Averichev, GS ;
Baldwin, A ;
Balewski, J ;
Barannikova, O ;
Barnby, LS ;
Baudot, J ;
Beddo, M ;
Bekele, S ;
Belaga, VV ;
Bellwied, R ;
Bennett, S ;
Bercovitz, J ;
Berger, J ;
Betts, W ;
Bichsel, H ;
Bieser, F ;
Bland, LC ;
Bloomer, M ;
Blyth, CO ;
Boehm, J ;
Bonner, BE ;
Bonnet, D ;
Bossingham, R ;
Botlo, M ;
Boucham, A ;
Bouillo, N ;
Bouvier, S ;
Bradley, K ;
Brady, FP ;
Braithwaite, ES ;
Braithwaite, W ;
Brandin, A ;
Brown, RL ;
Brugalette, G ;
Byrd, C ;
Caines, H ;
Sánchez, MCD ;
Cardenas, A ;
Carr, L .
PHYSICAL REVIEW LETTERS, 2001, 86 (03) :402-407