Pion, kaon, and proton production in central Pb-Pb collisions at sqrt[s(NN)] = 2.76 TeV.
In this Letter we report the first results on π(±), K(±), p, and p production at midrapidity (|y|<0.5) in central Pb-Pb collisions at sqrt[s(NN)] = 2.76 TeV, measured by the ALICE experiment at the LHC. The p(T) distributions and yields are compared to previous results at sqrt[s(NN)] = 200 GeV and expectations from hydrodynamic and thermal models. The spectral shapes indicate a strong increase of the radial flow velocity with sqrt[s(NN)], which in hydrodynamic models is expected as a consequence of the increasing particle density. While the K/π ratio is in line with predictions from the thermal model, the p/π ratio is found to be lower by a factor of about 1.5. This deviation from thermal model expectations is still to be understood.
Lawrence Livermore National Laboratory, Livermore, California, USA.
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G
Puddu
A
A
Pulvirenti
V
V
Punin
M
M
Putiš
J
J
Putschke
E
E
Quercigh
H
H
Qvigstad
A
A
Rachevski
A
A
Rademakers
T S
TS
Räihä
J
J
Rak
A
A
Rakotozafindrabe
L
L
Ramello
A
A
Ramírez Reyes
S
S
Raniwala
R
R
Raniwala
S S
SS
Räsänen
B T
BT
Rascanu
D
D
Rathee
K F
KF
Read
J S
JS
Real
K
K
Redlich
P
P
Reichelt
M
M
Reicher
R
R
Renfordt
A R
AR
Reolon
A
A
Reshetin
F
F
Rettig
J-P
JP
Revol
K
K
Reygers
L
L
Riccati
R A
RA
Ricci
T
T
Richert
M
M
Richter
P
P
Riedler
W
W
Riegler
F
F
Riggi
B
B
Rodrigues Fernandes Rabacal
M
M
Rodríguez Cahuantzi
A
A
Rodriguez Manso
K
K
Røed
D
D
Rohr
D
D
Röhrich
R
R
Romita
F
F
Ronchetti
P
P
Rosnet
S
S
Rossegger
A
A
Rossi
P
P
Roy
C
C
Roy
A J
AJ
Rubio Montero
R
R
Rui
R
R
Russo
E
E
Ryabinkin
A
A
Rybicki
S
S
Sadovsky
K
K
Safařík
R
R
Sahoo
P K
PK
Sahu
J
J
Saini
H
H
Sakaguchi
S
S
Sakai
D
D
Sakata
C A
CA
Salgado
J
J
Salzwedel
S
S
Sambyal
V
V
Samsonov
X
X
Sanchez Castro
L
L
Sándor
A
A
Sandoval
M
M
Sano
S
S
Sano
R
R
Santo
R
R
Santoro
J
J
Sarkamo
E
E
Scapparone
F
F
Scarlassara
R P
RP
Scharenberg
C
C
Schiaua
R
R
Schicker
H R
HR
Schmidt
C
C
Schmidt
S
S
Schreiner
S
S
Schuchmann
J
J
Schukraft
Y
Y
Schutz
K
K
Schwarz
K
K
Schweda
G
G
Scioli
E
E
Scomparin
P A
PA
Scott
R
R
Scott
G
G
Segato
I
I
Selyuzhenkov
S
S
Senyukov
J
J
Seo
S
S
Serci
E
E
Serradilla
A
A
Sevcenco
A
A
Shabetai
G
G
Shabratova
R
R
Shahoyan
N
N
Sharma
S
S
Sharma
S
S
Rohni
K
K
Shigaki
M
M
Shimomura
K
K
Shtejer
Y
Y
Sibiriak
M
M
Siciliano
E
E
Sicking
S
S
Siddhanta
T
T
Siemiarczuk
D
D
Silvermyr
C
C
Silvestre
G
G
Simatovic
G
G
Simonetti
R
R
Singaraju
R
R
Singh
S
S
Singha
V
V
Singhal
T
T
Sinha
B C
BC
Sinha
B
B
Sitar
M
M
Sitta
T B
TB
Skaali
K
K
Skjerdal
R
R
Smakal
N
N
Smirnov
R J M
RJ
Snellings
C
C
Søgaard
R
R
Soltz
H
H
Son
J
J
Song
M
M
Song
C
C
Soos
F
F
Soramel
I
I
Sputowska
M
M
Spyropoulou-Stassinaki
B K
BK
Srivastava
J
J
Stachel
I
I
Stan
I
I
Stan
G
G
Stefanek
M
M
Steinpreis
E
E
Stenlund
G
G
Steyn
J H
JH
Stiller
D
D
Stocco
M
M
Stolpovskiy
K
K
Strabykin
P
P
Strmen
A A P
AA
Suaide
M A
MA
Subieta Vásquez
T
T
Sugitate
C
C
Suire
M
M
Sukhorukov
R
R
Sultanov
M
M
Sumbera
T
T
Susa
T J M
TJ
Symons
A
A
Szanto de Toledo
I
I
Szarka
A
A
Szczepankiewicz
A
A
Szostak
M
M
Szymański
J
J
Takahashi
J D
JD
Tapia Takaki
A
A
Tauro
G
G
Tejeda Muñoz
A
A
Telesca
C
C
Terrevoli
J
J
Thäder
D
D
Thomas
R
R
Tieulent
A R
AR
Timmins
D
D
Tlusty
A
A
Toia
H
H
Torii
L
L
Toscano
V
V
Trubnikov
D
D
Truesdale
W H
WH
Trzaska
T
T
Tsuji
A
A
Tumkin
R
R
Turrisi
T S
TS
Tveter
J
J
Ulery
K
K
Ullaland
J
J
Ulrich
A
A
Uras
J
J
Urbán
G M
GM
Urciuoli
G L
GL
Usai
M
M
Vajzer
M
M
Vala
L
L
Valencia Palomo
S
S
Vallero
P
P
Vande Vyvre
M
M
van Leeuwen
L
L
Vannucci
A
A
Vargas
R
R
Varma
M
M
Vasileiou
A
A
Vasiliev
V
V
Vechernin
M
M
Veldhoen
M
M
Venaruzzo
E
E
Vercellin
S
S
Vergara
R
R
Vernet
M
M
Verweij
L
L
Vickovic
G
G
Viesti
O
O
Vikhlyantsev
Z
Z
Vilakazi
O
O
Villalobos Baillie
Y
Y
Vinogradov
A
A
Vinogradov
L
L
Vinogradov
T
T
Virgili
Y P
YP
Viyogi
A
A
Vodopyanov
S
S
Voloshin
K
K
Voloshin
G
G
Volpe
B
B
von Haller
D
D
Vranic
G
G
Ovrebekk
J
J
Vrláková
B
B
Vulpescu
A
A
Vyushin
V
V
Wagner
B
B
Wagner
R
R
Wan
Y
Y
Wang
M
M
Wang
D
D
Wang
Y
Y
Wang
K
K
Watanabe
M
M
Weber
J P
JP
Wessels
U
U
Westerhoff
J
J
Wiechula
J
J
Wikne
M
M
Wilde
A
A
Wilk
G
G
Wilk
M C S
MC
Williams
B
B
Windelband
L
L
Xaplanteris Karampatsos
C G
CG
Yaldo
Y
Y
Yamaguchi
S
S
Yang
H
H
Yang
S
S
Yasnopolskiy
J
J
Yi
Z
Z
Yin
I-K
IK
Yoo
J
J
Yoon
W
W
Yu
X
X
Yuan
I
I
Yushmanov
V
V
Zaccolo
C
C
Zach
C
C
Zampolli
S
S
Zaporozhets
A
A
Zarochentsev
P
P
Závada
N
N
Zaviyalov
H
H
Zbroszczyk
P
P
Zelnicek
I S
IS
Zgura
M
M
Zhalov
H
H
Zhang
X
X
Zhang
D
D
Zhou
Y
Y
Zhou
F
F
Zhou
J
J
Zhu
X
X
Zhu
J
J
Zhu
A
A
Zichichi
A
A
Zimmermann
G
G
Zinovjev
Y
Y
Zoccarato
M
M
Zynovyev
M
M
Zyzak