Relatorio tecnico

Directed flow of charged particles at mid-rapidity relative to the spectator plane in Pb–Pb collisions at p sNN = 2.76 TeV (2013)

• Authors:
  • Abelev, B
  • Carlin Filho, Nelson
  • Barros, Gabriel Oliveira Valeriano de
  • Deppman, Airton
  • Figueredo, Marcel Araujo Silva
  • Jahnke, Cristiane
  • Fernandes, Caio Lagana
  • Godoy, Denise Aparecida Moreira de
  • Munhoz, Marcelo Gameiro
  • Silva, Antonio Carlos Oliveira da
  • Oliveira Filho, Elienos Pereira de
  • Suaide, Alexandre Alarcon do Passo
  • Szanto de Toledo, Alejandro
• USP affiliated authors: CARLIN FILHO, NELSON - IF ; DEPPMAN, AIRTON - IF ; MUNHOZ, MARCELO GAMEIRO - IF ; SUAIDE, ALEXANDRE ALARCON DO PASSO - IF ; TOLEDO, ALEJANDRO SZANTO DE - IF
• Unidade: IF
• Assunto: COLISÕES DE ÍONS PESADOS RELATIVÍSTICOS
• Language: Inglês
• Abstract: The directed flow of charged particles at mid-rapidity was measured in Pb–Pb collisions at p sNN = 2.76 TeV relative to the collision plane defined by the spectator nucleons. The observed negative slope of the rapidity-odd directed flow component with about a three times smaller magnitude than observed at the highest RHIC energy suggests a smaller longitudinal tilt of initial system and disfavors a picture of strong fireball rotation predicted at the LHC energies. Measured for a first time with spectators, the rapidity-even directed flow component is found to be independent of pseudorapidity and change sign at transverse momenta around 1:2 - 1:7 GeV/c. Combined with an observation of a vanishing rapidity-even transverse momentum shift along the spectator deflection this forms a strong evidence for dipole-like initial density fluctuations in the overlap zone of the nuclei. Similar trends and a factor of forty smaller magnitude of the rapidity-even directed flow measured relative to the spectator plane and that previously estimated from correlation of two particles emitted at midrapidity indicates a weak correlation between fluctuating participant and spectator collision symmetry planes. These observations open a new direction for experimental probes of the initial conditions in heavy-ion collision with spectator nucleons.
• Imprenta:
  • Publisher place: São Paulo
  • Date published: 2013


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How to cite

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• ABNT

  ABELEV, B et al. Directed flow of charged particles at mid-rapidity relative to the spectator plane in Pb–Pb collisions at p sNN = 2.76 TeV. . São Paulo: Instituto de Física, Universidade de São Paulo. Disponível em: http://lanl.arxiv.org/pdf/1306.4145.pdf. Acesso em: 03 jan. 2026. , 2013

• APA

  Abelev, B., Carlin Filho, N., Barros, G. O. V. de, Deppman, A., Figueredo, M. A. S., Jahnke, C., et al. (2013). Directed flow of charged particles at mid-rapidity relative to the spectator plane in Pb–Pb collisions at p sNN = 2.76 TeV. São Paulo: Instituto de Física, Universidade de São Paulo. Recuperado de http://lanl.arxiv.org/pdf/1306.4145.pdf

• NLM

  Abelev B, Carlin Filho N, Barros GOV de, Deppman A, Figueredo MAS, Jahnke C, Fernandes CL, Godoy DAM de, Munhoz MG, Silva ACO da, Oliveira Filho EP de, Suaide AA do P, Szanto de Toledo A. Directed flow of charged particles at mid-rapidity relative to the spectator plane in Pb–Pb collisions at p sNN = 2.76 TeV [Internet]. 2013 ;[citado 2026 jan. 03 ] Available from: http://lanl.arxiv.org/pdf/1306.4145.pdf

• Vancouver

  Abelev B, Carlin Filho N, Barros GOV de, Deppman A, Figueredo MAS, Jahnke C, Fernandes CL, Godoy DAM de, Munhoz MG, Silva ACO da, Oliveira Filho EP de, Suaide AA do P, Szanto de Toledo A. Directed flow of charged particles at mid-rapidity relative to the spectator plane in Pb–Pb collisions at p sNN = 2.76 TeV [Internet]. 2013 ;[citado 2026 jan. 03 ] Available from: http://lanl.arxiv.org/pdf/1306.4145.pdf

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