Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/320013
Type: Artigo de Periódico
Title: Centrality Evolution Of The Charged-particle Pseudorapidity Density Over A Broad Pseudorapidity Range In Pb-pb Collisions At Root S(nn)=2.76tev
Author: Adam
J; Adamova
D; Aggarwal
MM; Rinella
GA; Agnello
M; Agrawal
N; Ahammed
Z; Ahn
SU; Aiola
S; Akindinov
A; Alam
SN; Aleksandrov
D; Alessandro
B; Alexandre
D; Molina
RA; Alici
A; Alkin
A; Almaraz
JRM; Alme
J; Alt
T; Altinpinar
S; Altsybeev
I; Prado
CAG; Andrei
C; Andronic
A; Anguelov
V; Anielski
J; Anticic
T; Antinori
F; Antonioli
P; Aphecetche
L; Appelshauser
H; Arcelli
S; Arnaldi
R; Arnold
OW; Arsene
IC; Arslandok
M; Audurier
B; Augustinus
A; Averbeck
R; Azmi
MD; Badala
A; Baek
YW; Bagnasco
S; Bailhache
R; Bala
R; Baldisseri
A; Baral
RC; Barbano
AM; Barbera
R; Barile
F; Barnafoldi
GG; Barnby
LS; Barret
V; Bartalini
P; Barth
K; Bartke
J; Bartsch
E; Basile
M; Bastid
N; Basu
S; Bathen
B; Batigne
G; Camejo
AB; Batyunya
B; Batzing
PC; Bearden
IG; Beck
H; Bedda
C; Behera
NK; Belikov
I; Bellini
F; Martinez
HB; Bellwied
R; Belmont
R; Belmont-Moreno
E; Belyaev
V; Bencedi
G; Beole
S; Berceanu
I; Bercuci
A; Berdnikov
Y; Berenyi
D; Bertens
RA; Berzano
D; Betev
L; Bhasin
A; Bhat
IR; Bhati
AK; Bhattacharjee
B; Bhom
J; Bianchi
L; Bianchi
N; Bianchin
C; Bielcik
J; Bielcikova
J; Bilandzic
A; Biswas
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JT; Blau
D; Blume
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M
Abstract: The centrality dependence of the charged-particle pseudorapidity density measured with ALICE in Pb-Pb collisions at root s(NN) = 2.76 TeV over a broad pseudorapidity range is presented. This Letter extends the previous results reported by ALICE to more peripheral collisions. No strong change of the overall shape of charged-particle pseudorapidity density distributions with centrality is observed, and when normalised to the number of participating nucleons in the collisions, the evolution over pseudorapidity with centrality is likewise small. The broad pseudorapidity range (-3.5 < eta < 5) allows precise estimates of the total number of produced charged particles which we find to range from 162 +/- 22(syst.) to 17170 +/- 770(syst.) in 80-90% and 0-5% central collisions, respectively. The total charged-particle multiplicity is seen to approximately scale with the number of participating nucleons in the collision. This suggests that hard contributions to the charged-particle multiplicity are limited. The results are compared to models which describe dN(ch)/d(eta) at mid-rapidity in the most central Pb-Pb collisions and it is found that these models do not capture all features of the distributions. (C) 2016 CERN for the benefit of the ALICE Collaboration. Published by Elsevier B.V.
Editor: ELSEVIER SCIENCE BV
Rights: aberto
Identifier DOI: 10.1016/j.physletb.2015.12.082
Address: http://www-sciencedirect-com.ez88.periodicos.capes.gov.br/science/article/pii/S0370269316000678
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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