The directed flow of charged particles at midrapidity is measured in Pb-Pb collisions at 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.

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

ARNALDI, Roberta;BALA, RENU;BEOLE', Stefania;BERZANO, DARIO CARLO DOMENICO;BIANCHI, LIVIO;BOTTA, Elena;BRUNA, ELENA;BUFALINO, STEFANIA;CORRALES MORALES, YASSER;FERRETTI, Alessandro;GAGLIARDI, Martino;GALLIO, Mauro;INNOCENTI, GIAN MICHELE;LEONCINO, MARCO;MASERA, Massimo;MILANO, LEONARDO;RAMELLO, Luciano;RIVETTI, Angelo;RUSSO, RICCARDO;SCOMPARIN, ENRICO;SITTA, Mario;VALLERO, Sara;VERCELLIN, Ermanno;
2013

Abstract

The directed flow of charged particles at midrapidity is measured in Pb-Pb collisions at 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.
PHYSICAL REVIEW LETTERS
111
232302
232302
direct flow
B. Abelev;J. Adam;D. Adamová;A. Adare;M. Aggarwal;G. Aglieri Rinella;M. Agnello;A. Agocs;A. Agostinelli;Z. Ahammed;N. Ahmad;A. Ahmad Masoodi;I. Ahmed;S. Ahn;S. Ahn;I. Aimo;M. Ajaz;A. Akindinov;D. Aleksandrov;B. Alessandro;D. 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. Arsene;M. Arslandok;A. Asryan;A. Augustinus;R. Averbeck;T. Awes;J. Äystö;M. Azmi;M. Bach;A. Badalà;Y. Baek;R. Bailhache;R. Bala;A. Baldisseri;F. Baltasar Dos Santos Pedrosa;J. Bán;R. Baral;R. Barbera;F. Barile;G. Barnaföldi;L. Barnby;V. Barret;J. Bartke;M. Basile;N. Bastid;S. Basu;B. Bathen;G. Batigne;B. Batyunya;P. Batzing;C. Baumann;I. Bearden;H. Beck;N. Behera;I. Belikov;F. Bellini;R. Bellwied;E. Belmont-Moreno;G. Bencedi;S. Beole;I. Berceanu;A. Bercuci;Y. Berdnikov;D. Berenyi;A. Bergognon;R. 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