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

Abelev, B.; Adam, J.; Adamová, Dagmar; Bielčík, J.; Bielčíková, Jana; Čepila, J.; Křelina, M.; Křížek, Filip; Krus, M.; Kučera, Vít; Kushpil, Svetlana; Kushpil, Vasilij; Mareš, Jiří A.; Pachr, M.; Petráček, V.; Petráň, M.; Polák, Karel; Pospíšil, V.; Schulc, M.; Šmakal, R.; Špaček, M.; Šumbera, Michal; Tlustý, D.; Vajzer, Michal; Wagner, V.; Zach, Č.; Závada, Petr

doi:https://dx.doi.org/10.1103/PhysRevLett.111.232302

Number of the records: 1

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

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SYSNO ASEP	0425246
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Directed Flow of Charged Particles at Midrapidity Relative to the Spectator Plane in Pb-Pb Collisions at root s(NN)=2.76TeV
Author(s)	Abelev, B. (US) Adam, J. (CZ) Adamová, Dagmar (UJF-V)_{RID, ORCID, SAI} Bielčík, J. (CZ) Bielčíková, Jana (UJF-V)_{RID, ORCID, SAI} Čepila, J. (CZ) Křelina, M. (CZ) Křížek, Filip (UJF-V)_{RID, ORCID, SAI} Krus, M. (CZ) Kučera, Vít (UJF-V)_RID Kushpil, Svetlana (UJF-V)_{RID, ORCID, SAI} Kushpil, Vasilij (UJF-V)_{ORCID, SAI} Mareš, Jiří A. (FZU-D)_{RID, ORCID} Pachr, M. (CZ) Petráček, V. (CZ) Petráň, M. (CZ) Polák, Karel (FZU-D) Pospíšil, V. (CZ) Schulc, M. (CZ) Šmakal, R. (CZ) Špaček, M. (CZ) Šumbera, Michal (UJF-V)_{RID, ORCID, SAI} Tlustý, D. (CZ) Vajzer, Michal (UJF-V)_RID Wagner, V. (CZ) Zach, Č. (CZ) Závada, Petr (FZU-D)_{RID, ORCID}
Number of authors	990
Source Title	Physical Review Letters. - : American Physical Society - ISSN 0031-9007 Roč. 111, č. 23 (2013), s. 232302
Number of pages	11 s.
Publication form	Print - P
Language	eng - English
Country	US - United States
Keywords	heavy ion collisions ; quark-gluon plasma ; ALICE
Subject RIV	BG - Nuclear, Atomic and Molecular Physics, Colliders
Subject RIV - cooperation	Institute of Physics - Elementary Particles and High Energy Physics
R&D Projects	LG13031 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
Institutional support	FZU-D - RVO:68378271 ; UJF-V - RVO:61389005
UT WOS	000328618300006
DOI	10.1103/PhysRevLett.111.232302
Annotation	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.
Workplace	Nuclear Physics Institute
Contact	Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228
Year of Publishing	2014

Number of the records: 1