Centrality dependence of the pseudorapidity density distribution for charged particles in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV
E. Abbas
,
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)
,
C. Cheshkov
(4)
,
B. Cheynis
(4)
,
H. Delagrange
(1)
,
O. Driga
(1)
,
L. Ducroux
(4)
,
B. Erazmus
(1)
,
Magali Estienne
(1)
,
Marie Germain
(1)
,
C. Geuna
(2)
,
Maxime Guilbaud
(4)
,
B. Hippolyte
(3)
,
C. Kuhn
(3)
,
A. Lardeux
(1)
,
Gines Martinez Garcia
(1)
,
A. Mas
(1)
,
L. Massacrier
(1)
,
H. Pereira da Costa
(2)
,
Philippe Pillot
(1)
,
A. Rakotozafindrabe
(2)
,
C. Roy
(3)
,
X. Sanchez Castro
(3)
,
Y. Schutz
(1)
,
S. Senyukov
(3)
,
Alexandre Shabetai
(1)
,
Diego Stocco
(1)
,
R. Tieulent
(4)
,
A. Uras
(4)
,
R. Vernet
(5)
,
H. Yang
(2)
,
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
E. Abbas
- 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
C. Roy
- Function : Author
- PersonId : 742351
- IdHAL : christelle-roy
- ORCID : 0000-0001-5920-6271
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.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
We present the first wide-range measurement of the charged-particle pseudorapidity density distribution, for different centralities (the 0-5%, 5-10%, 10-20%, and 20-30% most central events) in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV at the LHC. The measurement is performed using the full coverage of the ALICE detectors, -5.0 < eta < 5.5, and employing a special analysis technique based on collisions arising from LHC 'satellite' bunches. We present the pseudorapidity density as a function of the number of participating nucleons as well as an extrapolation to the total number of produced charged particles Nch = 17165 +/- 772 for the 0-5% most central collisions). From the measured dNch/deta distribution we derive the rapidity density distribution, dNch/dy, under simple assumptions. The rapidity density distribution is found to be significantly wider than the predictions of the Landau model, which reproduce data well at RHIC energies. We assess the validity of longitudinal scaling by comparing to lower energy results from RHIC. Finally the mechanisms of the underlying particle production are discussed based on a comparison with various theoretical models.