Directed flow of charged particles at midrapidity relative to the spectator plane in Pb-Pb collisions at √sNN=2.76 TeV
The directed flow of charged particles at midrapidity is measured in Pb-Pb collisions at √sNN=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 t...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
6 December 2013
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| In: |
Physical review letters
Year: 2013, Jahrgang: 111, Heft: 23, Pages: 1-11 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.111.232302 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.111.232302 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.111.232302 
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| Verfasserangaben: | B. Abelev et al. (ALICE Collaboration) |
MARC
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| 245 | 1 | 0 | |a Directed flow of charged particles at midrapidity relative to the spectator plane in Pb-Pb collisions at √sNN=2.76 TeV |c B. Abelev et al. (ALICE Collaboration) |
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| 246 | 3 | 3 | |a Directed flow of charged particles at midrapidity relative to the spectator plane in Pb-Pb collisions at square root sNN=2.76 TeV |
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| 500 | |a The ALICE collaboration: B. Abelev, V. Angelov, O. Busch, M. Fasel, P. Glässel, R. Grajcarek, N. Herrmann, J. Klein, M.J. Kweon, D. Lohner, X.-G. Lu, A. Maire, J. Mercado-Pérez, H. Oeschler, K. Oyama, Y. Pachmayer, F. Reidt, K. Reygers, R. Schicker, J. Stachel, J.H. Stiller, J. Ulrich, M.A. Völkl, Y. Wang, J. Wilkinson, B. Windelband, M. Winn, A. Zimmermann und weitere 961 | ||
| 500 | |a Gesehen am 30.04.2021 | ||
| 520 | |a The directed flow of charged particles at midrapidity is measured in Pb-Pb collisions at √sNN=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 pT between 1.2 and 1.7 GeV/c. Combined with the observation of a vanishing rapidity-even pT 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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