Midrapidity antiproton-to-proton ratio in pp collisons at sqrt[s]=0.9 and 7 TeV measured by the ALICE experiment.
The ratio of the yields of antiprotons to protons in pp collisions has been measured by the ALICE experiment at sqrt[s]=0.9 and 7 TeV during the initial running periods of the Large Hadron Collider. The measurement covers the transverse momentum interval 0.45<p_{t}<1.05  GeV/c and rapidity |y|<0.5. The ratio is measured to be R_{|y|<0.5}=0.957±0.006(stat)±0.014(syst) at 0.9 TeV and R_{|y|<0.5}=0.991±0.005(stat)±0.014(syst) at 7 TeV and it is independent of both rapidity and transverse momentum. The results are consistent with the conventional model of baryon-number transport and set stringent limits on any additional contributions to baryon-number transfer over very large rapidity intervals in pp collisions.
Aamodt
K
K
Department of Physics, University of Oslo, Oslo, Norway.
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H
Peressounko
D
D
Pérez
C
C
Perini
D
D
Perrino
D
D
Peryt
W
W
Peschek
J
J
Pesci
A
A
Peskov
V
V
Pestov
Y
Y
Peters
A J
AJ
Petrácek
V
V
Petridis
A
A
Petris
M
M
Petrov
P
P
Petrovici
M
M
Petta
C
C
Peyré
J
J
Piano
S
S
Piccotti
A
A
Pikna
M
M
Pillot
P
P
Pinazza
O
O
Pinsky
L
L
Pitz
N
N
Piuz
F
F
Platt
R
R
Płoskoń
M
M
Pluta
J
J
Pocheptsov
T
T
Pochybova
S
S
Podesta Lerma
P L M
PL
Poggio
F
F
Poghosyan
M G
MG
Polák
K
K
Polichtchouk
B
B
Polozov
P
P
Polyakov
V
V
Pommeresch
B
B
Pop
A
A
Posa
F
F
Pospísil
V
V
Potukuchi
B
B
Pouthas
J
J
Prasad
S K
SK
Preghenella
R
R
Prino
F
F
Pruneau
C A
CA
Pshenichnov
I
I
Puddu
G
G
Pujahari
P
P
Pulvirenti
A
A
Punin
A
A
Punin
V
V
Putis
M
M
Putschke
J
J
Quercigh
E
E
Rachevski
A
A
Rademakers
A
A
Radomski
S
S
Räihä
T S
TS
Rak
J
J
Rakotozafindrabe
A
A
Ramello
L
L
Ramírez Reyes
A
A
Rammler
M
M
Raniwala
R
R
Raniwala
S
S
Räsänen
S S
SS
Rashevskaya
I
I
Rath
S
S
Read
K F
KF
Real
J S
JS
Redlich
K
K
Renfordt
R
R
Reolon
A R
AR
Reshetin
A
A
Rettig
F
F
Revol
J-P
JP
Reygers
K
K
Ricaud
H
H
Riccati
L
L
Ricci
R A
RA
Richter
M
M
Riedler
P
P
Riegler
W
W
Riggi
F
F
Rivetti
A
A
Rodriguez Cahuantzi
M
M
Røed
K
K
Röhrich
D
D
Román López
S
S
Romita
R
R
Ronchetti
F
F
Rosinský
P
P
Rosnet
P
P
Rossegger
S
S
Rossi
A
A
Roukoutakis
F
F
Rousseau
S
S
Roy
C
C
Roy
P
P
Rubio-Montero
A J
AJ
Rui
R
R
Rusanov
I
I
Russo
G
G
Ryabinkin
E
E
Rybicki
A
A
Sadovsky
S
S
Safarík
K
K
Sahoo
R
R
Saini
J
J
Saiz
P
P
Sakata
D
D
Salgado
C A
CA
Salgueiro Domingues da Silva
R
R
Salur
S
S
Samanta
T
T
Sambyal
S
S
Samsonov
V
V
Sándor
L
L
Sandoval
A
A
Sano
M
M
Sano
S
S
Santo
R
R
Santoro
R
R
Sarkamo
J
J
Saturnini
P
P
Scapparone
E
E
Scarlassara
F
F
Scharenberg
R P
RP
Schiaua
C
C
Schicker
R
R
Schindler
H
H
Schmidt
C
C
Schmidt
H R
HR
Schossmaier
K
K
Schreiner
S
S
Schuchmann
S
S
Schukraft
J
J
Schutz
Y
Y
Schwarz
K
K
Schweda
K
K
Scioli
G
G
Scomparin
E
E
Scott
P A
PA
Segato
G
G
Semenov
D
D
Senyukov
S
S
Seo
J
J
Serci
S
S
Serkin
L
L
Serradilla
E
E
Sevcenco
A
A
Sgura
I
I
Shabratova
G
G
Shahoyan
R
R
Sharkov
G
G
Sharma
N
N
Sharma
S
S
Shigaki
K
K
Shimomura
M
M
Shtejer
K
K
Sibiriak
Y
Y
Siciliano
M
M
Sicking
E
E
Siddi
E
E
Siemiarczuk
T
T
Silenzi
A
A
Silvermyr
D
D
Simili
E
E
Simonetti
G
G
Singaraju
R
R
Singh
R
R
Singhal
V
V
Sinha
B C
BC
Sinha
T
T
Sitar
B
B
Sitta
M
M
Skaali
T B
TB
Skjerdal
K
K
Smakal
R
R
Smirnov
N
N
Snellings
R
R
Snow
H
H
Søgaard
C
C
Soloviev
A
A
Soltveit
H K
HK
Soltz
R
R
Sommer
W
W
Son
C W
CW
Son
H
H
Song
M
M
Soos
C
C
Soramel
F
F
Soyk
D
D
Spyropoulou-Stassinaki
M
M
Srivastava
B K
BK
Stachel
J
J
Staley
F
F
Stan
E
E
Stefanek
G
G
Stefanini
G
G
Steinbeck
T
T
Stenlund
E
E
Steyn
G
G
Stocco
D
D
Stock
R
R
Stolpovsky
P
P
Strmen
P
P
Suaide
A A P
AA
Subieta Vásquez
M A
MA
Sugitate
T
T
Suire
C
C
Sumbera
M
M
Susa
T
T
Swoboda
D
D
Symons
J
J
Szanto de Toledo
A
A
Szarka
I
I
Szostak
A
A
Szuba
M
M
Tadel
M
M
Tagridis
C
C
Takahara
A
A
Takahashi
J
J
Tanabe
R
R
Tapia Takaki
J D
JD
Taureg
H
H
Tauro
A
A
Tavlet
M
M
Tejeda Muñoz
G
G
Telesca
A
A
Terrevoli
C
C
Thäder
J
J
Tieulent
R
R
Tlusty
D
D
Toia
A
A
Tolyhy
T
T
Torcato de Matos
C
C
Torii
H
H
Torralba
G
G
Toscano
L
L
Tosello
F
F
Tournaire
A
A
Traczyk
T
T
Tribedy
P
P
Tröger
G
G
Truesdale
D
D
Trzaska
W H
WH
Tsiledakis
G
G
Tsilis
E
E
Tsuji
T
T
Tumkin
A
A
Turrisi
R
R
Turvey
A
A
Tveter
T S
TS
Tydesjö
H
H
Tywoniuk
K
K
Ulery
J
J
Ullaland
K
K
Uras
A
A
Urbán
J
J
Urciuoli
G M
GM
Usai
G L
GL
Vacchi
A
A
Vala
M
M
Valencia Palomo
L
L
Vallero
S
S
van der Kolk
N
N
Vande Vyvre
P
P
van Leeuwen
M
M
Vannucci
L
L
Vargas
A
A
Varma
R
R
Vasiliev
A
A
Vassiliev
I
I
Vasileiou
M
M
Vechernin
V
V
Venaruzzo
M
M
Vercellin
E
E
Vergara
S
S
Vernet
R
R
Verweij
M
M
Vetlitskiy
I
I
Vickovic
L
L
Viesti
G
G
Vikhlyantsev
O
O
Vilakazi
Z
Z
Villalobos Baillie
O
O
Vinogradov
A
A
Vinogradov
L
L
Vinogradov
Y
Y
Virgili
T
T
Viyogi
Y P
YP
Vodopianov
A
A
Voloshin
K
K
Voloshin
S
S
Volpe
G
G
von Haller
B
B
Vranic
D
D
Vrláková
J
J
Vulpescu
B
B
Wagner
B
B
Wagner
V
V
Wallet
L
L
Wan
R
R
Wang
D
D
Wang
Y
Y
Wang
Y
Y
Watanabe
K
K
Wen
Q
Q
Wessels
J
J
Westerhoff
U
U
Wiechula
J
J
Wikne
J
J
Wilk
A
A
Wilk
G
G
Williams
M C S
MC
Willis
N
N
Windelband
B
B
Xu
C
C
Yang
C
C
Yang
H
H
Yasnopolskiy
S
S
Yermia
F
F
Yi
J
J
Yin
Z
Z
Yokoyama
H
H
Yoo
I-K
IK
Yuan
X
X
Yurevich
V
V
Yushmanov
I
I
Zabrodin
E
E
Zagreev
B
B
Zalite
A
A
Zampolli
C
C
Zanevsky
Yu
Y
Zaporozhets
S
S
Zarochentsev
A
A
Závada
P
P
Zbroszczyk
H
H
Zelnicek
P
P
Zenin
A
A
Zepeda
A
A
Zgura
I
I
Zhalov
M
M
Zhang
X
X
Zhou
D
D
Zhou
S
S
Zhu
J
J
Zichichi
A
A
Zinchenko
A
A
Zinovjev
G
G
Zoccarato
Y
Y
Zychácek
V
V
Zynovyev
M
M