Directed Flow of Charged Particles at Midrapidity Relative to the Spectator Plane in Pb-Pb Collisions at sqrt[s_{NN}]=2.76 TeV.

B Abelev, J Adam, D Adamová, A M Adare, M M Aggarwal, G Aglieri Rinella, M Agnello, A G Agocs, A Agostinelli, Z Ahammed, N Ahmad, A Ahmad Masoodi, I Ahmed, S A Ahn, S U Ahn, I Aimo, M Ajaz, A Akindinov, D Aleksandrov, B AlessandroD Alexandre, A Alici, A Alkin, J Alme, T Alt, V Altini, S Altinpinar, I Altsybeev, C Andrei, A Andronic, V Anguelov, J Anielski, C Anson, T Antičić, F Antinori, P Antonioli, L Aphecetche, H Appelshäuser, N Arbor, S Arcelli, A Arend, N Armesto, R Arnaldi, T Aronsson, I C Arsene, M Arslandok, A Asryan, A Augustinus, R Averbeck, T C Awes, J Aystö, M D Azmi, M Bach, A Badalà, Y W Baek, R Bailhache, R Bala, A Baldisseri, F Baltasar Dos Santos Pedrosa, J Bán, R C Baral, R Barbera, F Barile, G G Barnaföldi, L S Barnby, V Barret, J Bartke, M Basile, N Bastid, S Basu, B Bathen, G Batigne, B Batyunya, P C Batzing, C Baumann, I G Bearden, H Beck, N K Behera, I Belikov, F Bellini, R Bellwied, E Belmont-Moreno, G Bencedi, S Beole, I Berceanu, A Bercuci, Y Berdnikov, D 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S Choudhury, P Christakoglou, C H Christensen, Peter Christiansen, T Chujo, S U Chung, C Cicalo, L Cifarelli, F Cindolo, J Cleymans, F Colamaria, D Colella, A Collu, G Conesa Balbastre, Z Conesa Del Valle, M E Connors, G Contin, J G Contreras, T M Cormier, Y Corrales Morales, P Cortese, I Cortés Maldonado, M R Cosentino, F Costa, M E Cotallo, E Crescio, P Crochet, E Cruz Alaniz, R Cruz Albino, E Cuautle, L Cunqueiro, T R Czopowicz, A Dainese, R Dang, A Danu, D Das, I Das, S Das, K Das, A Dash, S Dash, S De, G O V de Barros, A De Caro, G de Cataldo, J de Cuveland, A De Falco, D De Gruttola, H Delagrange, A Deloff, N De Marco, E Dénes, S De Pasquale, A Deppman, G D'Erasmo, R de Rooij, M A Diaz Corchero, D Di Bari, T Dietel, C Di Giglio, S Di Liberto, A Di Mauro, P Di Nezza, R Divià, O Djuvsland, Alexandru Dobrin, T Dobrowolski, B Dönigus, O Dordic, A K Dubey, A Dubla, L Ducroux, P Dupieux, A K Dutta Majumdar, D Elia, B G Elwood, D Emschermann, H Engel, B Erazmus, H A Erdal, D Eschweiler, 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Abstract

The directed flow of charged particles at midrapidity is measured in Pb-Pb collisions at sqrt[s_{NN}]=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.
Original languageEnglish
Article number232302
JournalPhysical Review Letters
Volume111
Issue number23
DOIs
Publication statusPublished - 2013

Subject classification (UKÄ)

  • Subatomic Physics

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