Measurement of the azimuthal anisotropy for charged particle production in sqrt(s_NN) = 2.76 TeV lead-lead collisions with the ATLAS detector
G. Aad
,
L. Aperio Bella
(1)
,
B. Aubert
(1)
,
N. Berger
(1)
,
J. Colas
(1)
,
M. Delmastro
(1)
,
L. Di Ciaccio
(1)
,
T.K.O. Doan
(1)
,
S. Elles
(1)
,
C. Goy
(1)
,
L. Helary
(1)
,
T. Hryn'Ova
(1)
,
A. Jérémie
(1)
,
S. Jézéquel
(1)
,
M. Kataoka
(1)
,
J. Labbe
(1)
,
R. Lafaye
(1)
,
J. Leveque
(1)
,
V.P. Lombardo
(1)
,
N. Massol
(1)
,
P. Perrodo
(1)
,
E. Petit
(1)
,
H. Przysiezniak
(1)
,
G. Sauvage
(1)
,
E. Sauvan
(1)
,
M. Schwoerer
(1)
,
T. Todorov
(1)
,
D. Tsionou
(1)
,
I. Wingerter-Seez
(1)
,
R. Zitoun
(1)
,
Y. Zolnierowski
(1)
,
C. Biscarat
(2)
,
E. Cogneras
(2)
,
G. Rahal
(2)
,
S. Abdel Khalek
(3)
,
H. Abreu
(3)
,
N. Andari
(3)
,
C. Arnault
(3)
,
E. Augé
(3)
,
P. Barrillon
(3)
,
M. Benoit
(3)
,
S. Binet
(3)
,
C. Bourdarios
(3)
,
C. de La Taille
(3)
,
J.B. de Vivie de Regie
(3)
,
L. Duflot
(3)
,
M. Escalier
(3)
,
L. Fayard
(3)
,
D. Fournier
(3)
,
J.-F. Grivaz
(3)
,
S. Henrot-Versillé
(3)
,
J. Hrivnac
(3)
,
L. Iconomidou-Fayard
(3)
,
J. Idarraga
(3)
,
M. Kado
(3)
,
N. Lorenzo Martinez
(3)
,
A. Lounis
(3)
,
N. Makovec
(3)
,
P. Matricon
(3)
,
F. Niedercorn
(3)
,
L. Poggioli
(3)
,
P. Puzo
(3)
,
A. Renaud
(3)
,
D. Rousseau
(3)
,
G. Rybkin
(3)
,
J.B. Sauvan
(3)
,
J. Schaarschmidt
(3)
,
A.C. Schaffer
(3)
,
E. Scifo
(3)
,
L. Serin
(3)
,
S. Simion
(3)
,
R. Tanaka
(3)
,
M. Teinturier
(3)
,
J.J. Veillet
(3)
,
I. Vukotic
(3)
,
F. Wicek
(3)
,
D. Zerwas
(3)
,
Z. Zhang
(3)
,
D. Boumediene
(4)
,
Emmanuel Busato
(4)
,
D. Calvet
(4)
,
S. Calvet
(4)
,
Reina Coromoto Camacho Toro
(4)
,
Diane Cinca
(5)
,
J. Donini
(4)
,
R. Febbraro
(4)
,
N. Ghodbane
(4)
,
C. Guicheney
(4)
,
H. Liao
(4)
,
D. Pallin
(4)
,
Daniela Paredes Hernández
(4)
,
F. Podlyski
(4)
,
C. Santoni
(4)
,
L. P. Says
(4)
,
F. Vazeille
(4)
,
S. Albrand
(6)
,
M.L. Andrieux
(6)
,
Q. Buat
(6)
,
B. Clement
(6)
,
J. Collot
(6)
,
S. Crépé-Renaudin
(6)
,
B. Dechenaux
(6)
,
T. Delemontex
(6)
,
P.A. Delsart
(6)
,
M.H. Genest
(6)
,
J.Y. Hostachy
(6)
,
E. Laisne
(6)
,
F. Ledroit-Guillon
(6)
,
A. Lleres
(6)
,
A. Lucotte
(6)
,
F. Malek
(6)
,
P. Martin
(6)
,
F. Polci
(6)
,
J. Stark
(6)
,
X. Sun
(6)
,
B. Trocmé
(6)
,
J. Wang
(6)
,
C. Weydert
(6)
,
S. Aoun
(7)
,
C. P. Bee
(7)
,
C. Bertella
(7)
,
N. Bousson
(7)
,
J. C. Clémens
(7)
,
Y. Coadou
(7)
,
F. Djama
(7)
,
F. Etienne
(7)
,
L. Feligioni
(7)
,
F. Henry-Couannier
(7)
,
D. Hoffmann
(7)
,
F. Hubaut
(7)
,
E. B. F. G. Knoops
(7)
,
E. Le Guirriec
(7)
,
B. Li
(7)
,
J. Maurer
(7)
,
E. Monnier
(7)
,
J. Odier
(7)
,
P. Pralavorio
(7)
,
Z. Qian
(7)
,
A. Rozanov
(7)
,
M. Talby
(7)
,
N. Tannoury
(7)
,
S. Tisserant
(7)
,
J. Toth
(7)
,
F. Touchard
(7)
,
L. Vacavant
(7)
1
LAPP -
Laboratoire d'Annecy de Physique des Particules
2 CC-IN2P3 - Centre de Calcul de l'IN2P3
3 LAL - Laboratoire de l'Accélérateur Linéaire
4 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
5 Laboratoire de Physique Corpusculaire
6 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
7 CPPM - Centre de Physique des Particules de Marseille
2 CC-IN2P3 - Centre de Calcul de l'IN2P3
3 LAL - Laboratoire de l'Accélérateur Linéaire
4 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
5 Laboratoire de Physique Corpusculaire
6 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
7 CPPM - Centre de Physique des Particules de Marseille
G. Aad
- Function : Author
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- ORCID : 0000-0002-6665-4934
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N. Berger
- Function : Author
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C. Goy
- Function : Author
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T. Hryn'Ova
- Function : Author
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- ORCID : 0000-0001-5914-8614
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S. Jézéquel
- Function : Author
- PersonId : 739301
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E. Cogneras
- Function : Author
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E. Augé
- Function : Author
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J.B. de Vivie de Regie
- Function : Author
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- IdHAL : jean-baptiste-de-vivie
- ORCID : 0000-0001-9163-2211
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S. Henrot-Versillé
- Function : Author
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- IdRef : 191080403
D. Rousseau
- Function : Author
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- IdHAL : david-rousseau
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Z. Zhang
- Function : Author
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D. Calvet
- Function : Author
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- IdHAL : david-calvet
- ORCID : 0000-0002-9953-5333
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Reina Coromoto Camacho Toro
- Function : Author
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- IdHAL : reina-camacho-toro
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- IdRef : 168138077
Diane Cinca
- Function : Author
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Daniela Paredes Hernández
- Function : Author
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S. Crépé-Renaudin
- Function : Author
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- IdHAL : sabine-crepe
- ORCID : 0000-0001-5980-5805
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M.H. Genest
- Function : Author
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- IdHAL : marie-helene-genest
- ORCID : 0000-0002-4098-2024
- IdRef : 191694142
F. Malek
- Function : Author
- PersonId : 21915
- IdHAL : fairouz-malek
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Y. Coadou
- Function : Author
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Abstract
Differential measurements of charged particle azimuthal anisotropy are presented for lead-lead collisions at sqrt(s_NN) = 2.76 TeV with the ATLAS detector at the LHC, based on an integrated luminosity of approximately 8 mb^-1. This anisotropy is characterized via a Fourier expansion of the distribution of charged particles in azimuthal angle (phi), with the coefficients v_n denoting the magnitude of the anisotropy. Significant v_2-v_6 values are obtained as a function of transverse momentum (0.5=3 are found to vary weakly with both eta and centrality, and their pT dependencies are found to follow an approximate scaling relation, v_n^{1/n}(pT) \propto v_2^{1/2}(pT). A Fourier analysis of the charged particle pair distribution in relative azimuthal angle (Dphi=phi_a-phi_b) is performed to extract the coefficients v_{n,n}=. For pairs of charged particles with a large pseudorapidity gap (|Deta=eta_a-eta_b|>2) and one particle with pT<3 GeV, the v_{2,2}-v_{6,6} values are found to factorize as v_{n,n}(pT^a,pT^b) ~ v_n(pT^a)v_n(pT^b) in central and mid-central events. Such factorization suggests that these values of v_{2,2}-v_{6,6} are primarily due to the response of the created matter to the fluctuations in the geometry of the initial state. A detailed study shows that the v_{1,1}(pT^a,pT^b) data are consistent with the combined contributions from a rapidity-even v_1 and global momentum conservation. A two-component fit is used to extract the v_1 contribution. The extracted v_1 is observed to cross zero at pT\sim1.0 GeV, reaches a maximum at 4-5 GeV with a value comparable to that for v_3, and decreases at higher pT.