Directed flow of charged particles at mid-rapidity relative to the spectator plane in Pb-Pb collisions at sqrt{s_NN}=2.76 TeV
B. Abelev
,
Laurent Aphecetche
(1)
,
A. Baldisseri
(2)
,
Guillaume Batigne
(1)
,
I. Belikov
(3)
,
A.A.E. Bergognon
(1)
,
H. Borel
(2)
,
M. Bregant
(1)
,
J. Castillo Castellanos
(2)
,
J.L. Charvet
(2)
,
B. Cheynis
(4)
,
H. Delagrange
(1)
,
L. Ducroux
(4)
,
B. Erazmus
(1)
,
Magali Estienne
(1)
,
Marie Germain
(1)
,
J.-Y. Grossiord
(4)
,
Maxime Guilbaud
(4)
,
B. Hippolyte
(3)
,
C. Kuhn
(3)
,
A. Lardeux
(1)
,
J. Martin Blanco
(1)
,
Gines Martinez Garcia
(1)
,
A. Mas
(1)
,
L. Massacrier
(1)
,
L. Molnar
(3)
,
H. Pereira da Costa
(2)
,
Philippe Pillot
(1)
,
A. Rakotozafindrabe
(1)
,
X. Sanchez Castro
(3)
,
Y. Schutz
(1)
,
S. Senyukov
(3)
,
Alexandre Shabetai
(1)
,
Diego Stocco
(1)
,
A. Uras
(4)
,
R. Vernet
(5)
,
Y. Zoccarato
(4)
,
N. Arbor
(6)
,
G. Conesa Balbastre
(6)
,
J. Faivre
(6)
,
C. Furget
(6)
,
R. Guernane
(6)
,
S. Kox
(6)
,
J.S. Real
(6)
,
C. Silvestre
(6)
,
Y.W. Baek
(7)
,
V. Barret
(7)
,
N. Bastid
(7)
,
P. Crochet
(7)
,
P. Dupieux
(7)
,
R. Ichou
(7)
,
S. Li
(7)
,
X. Lopez
(7)
,
F. Manso
(7)
,
M. Marchisone
(7)
,
S. Porteboeuf-Houssais
(7)
,
P. Rosnet
(7)
,
B. Vulpescu
(7)
,
X. Zhang
(7)
,
Z. Conesa Del Valle
(8)
,
I. Das
(8)
,
B. Espagnon
(8)
,
C. Hadjidakis
(8)
,
I. Lakomov
(8)
,
C. Suire
(8)
,
J. D. Tapia Takaki
(8)
,
L. Valencia Palomo
(8)
1
SUBATECH -
Laboratoire SUBATECH Nantes
2 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
3 DRS-IPHC - Département Recherches Subatomiques
4 IPNL - Institut de Physique Nucléaire de Lyon
5 CC-IN2P3 - Centre de Calcul de l'IN2P3
6 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
7 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
8 IPNO - Institut de Physique Nucléaire d'Orsay
2 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
3 DRS-IPHC - Département Recherches Subatomiques
4 IPNL - Institut de Physique Nucléaire de Lyon
5 CC-IN2P3 - Centre de Calcul de l'IN2P3
6 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
7 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
8 IPNO - Institut de Physique Nucléaire d'Orsay
B. Abelev
- Function : Author
Laurent Aphecetche
- Function : Author
- PersonId : 2010
- IdHAL : laurent-aphecetche
- ORCID : 0000-0001-7662-3878
- IdRef : 113847653
Guillaume Batigne
- Function : Author
- PersonId : 175820
- IdHAL : guillaume-batigne
- ORCID : 0000-0001-8638-6300
- IdRef : 077207874
B. Cheynis
- Function : Author
- PersonId : 750577
- IdHAL : brigitte-cheynis
- IdRef : 032215606
Magali Estienne
- Function : Author
- PersonId : 179790
- IdHAL : magali-estienne
- ORCID : 0000-0003-0687-5580
Marie Germain
- Function : Author
- PersonId : 170960
- IdHAL : marie-germain
- ORCID : 0000-0001-7382-1609
- IdRef : 176579958
Maxime Guilbaud
- Function : Author
- PersonId : 177174
- IdHAL : maxime-guilbaud
- ORCID : 0000-0001-5990-482X
- IdRef : 236157566
Gines Martinez Garcia
- Function : Author
- PersonId : 169952
- IdHAL : gines-martinez
- ORCID : 0000-0002-8657-6742
- IdRef : 068952961
Philippe Pillot
- Function : Author
- PersonId : 175815
- IdHAL : ppillot
- ORCID : 0000-0002-9067-0803
Alexandre Shabetai
- Function : Author
- PersonId : 181202
- IdHAL : alexandre-shabetai
- ORCID : 0000-0003-3069-726X
Diego Stocco
- Function : Author
- PersonId : 170966
- IdHAL : diego-stocco
- ORCID : 0000-0002-5377-5163
- IdRef : 204479150
G. Conesa Balbastre
- Function : Author
- PersonId : 737477
- IdHAL : conesa-balbastre-gustavo
- ORCID : 0000-0001-5283-3520
J. Faivre
- Function : Author
- PersonId : 1491080
- ORCID : 0009-0007-8219-3334
C. Furget
- Function : Author
- PersonId : 1400531
- ORCID : 0009-0004-9666-7156
J.S. Real
- Function : Author
- PersonId : 737490
- IdHAL : jean-sebastien-real
- ORCID : 0000-0003-1584-783X
- IdRef : 156873133
S. Porteboeuf-Houssais
- Function : Author
- PersonId : 1350722
- IdHAL : sarah-porteboeuf
- ORCID : 0000-0002-2646-6189
Abstract
The directed flow of charged particles at mid-rapidity is measured in Pb-Pb collisions at sqrt{s_NN}=2.76 TeV relative to the collision plane defined by the spectator nucleons. Both, the rapidity odd (v_1^odd) and even (v_1^even) directed flow components are reported. The v_1^odd component has a negative slope as a function of pseudorapidity similar to that observed at the highest RHIC energy, but with about a three times smaller magnitude. The v^even component is found to be non-zero and independent of pseudorapidity. Both components show little dependence on the collision centrality and change sign at transverse momenta around 1.2-1.7 GeV/c for midcentral collisions. The shape of v_1^even as a function of transverse momentum and a vanishing transverse momentum shift along the spectator deflection for v_1^even are consistent with dipole-like initial density fluctuations in the overlap zone of the nuclei.