Flavor decomposition of the sea-quark helicity distributions in the nucleon from semiinclusive deep inelastic scattering.
Double-spin asymmetries of semiinclusive cross sections for the production of identified pions and kaons have been measured in deep inelastic scattering of polarized positrons on a polarized deuterium target. Five helicity distributions including those for three sea quark flavors were extracted from these data together with reanalyzed previous data for identified pions from a hydrogen target. These distributions are consistent with zero for all three sea flavors. A recently predicted flavor asymmetry in the polarization of the light quark sea appears to be disfavored by the data.
Airapetian
A
A
Yerevan Physics Institute, 375036 Yerevan, Armenia.
Akopov
N
N
Akopov
Z
Z
Amarian
M
M
Ammosov
V V
VV
Andrus
A
A
Aschenauer
E C
EC
Augustyniak
W
W
Avakian
R
R
Avetissian
A
A
Avetissian
E
E
Bailey
P
P
Baturin
V
V
Baumgarten
C
C
Beckmann
M
M
Belostotski
S
S
Bernreuther
S
S
Bianchi
N
N
Blok
H P
HP
Böttcher
H
H
Borissov
A
A
Bouwhuis
M
M
Brack
J
J
Brüll
A
A
Bryzgalov
V
V
Capitani
G P
GP
Chiang
H C
HC
Ciullo
G
G
Contalbrigo
M
M
Dalpiaz
P F
PF
De Leo
R
R
De Nardo
L
L
De Sanctis
E
E
Devitsin
E
E
Di Nezza
P
P
Düren
M
M
Ehrenfried
M
M
Elalaoui-Moulay
A
A
Elbakian
G
G
Ellinghaus
F
F
Elschenbroich
U
U
Ely
J
J
Fabbri
R
R
Fantoni
A
A
Fechtchenko
A
A
Felawka
L
L
Fox
B
B
Franz
J
J
Frullani
S
S
Gärber
Y
Y
Gapienko
G
G
Gapienko
V
V
Garibaldi
F
F
Garrow
K
K
Garutti
E
E
Gaskell
D
D
Gavrilov
G
G
Gharibyan
V
V
Graw
G
G
Grebeniouk
O
O
Greeniaus
L G
LG
Hafidi
K
K
Hartig
M
M
Hasch
D
D
Heesbeen
D
D
Henoch
M
M
Hertenberger
R
R
Hesselink
W H A
WH
Hillenbrand
A
A
Hoek
M
M
Holler
Y
Y
Hommez
B
B
Iarygin
G
G
Ivanilov
A
A
Izotov
A
A
Jackson
H E
HE
Jgoun
A
A
Kaiser
R
R
Kinney
E
E
Kisselev
A
A
Königsmann
K
K
Kopytin
M
M
Korotkov
V
V
Kozlov
V
V
Krauss
B
B
Krivokhijine
V G
VG
Lagamba
L
L
Lapikás
L
L
Laziev
A
A
Lenisa
P
P
Liebing
P
P
Lindemann
T
T
Lipka
K
K
Lorenzon
W
W
Lu
J
J
Maiheu
B
B
Makins
N C R
NC
Marianski
B
B
Marukyan
H
H
Masoli
F
F
Mexner
V
V
Meyners
N
N
Mikloukho
O
O
Miller
C A
CA
Miyachi
Y
Y
Muccifora
V
V
Nagaitsev
A
A
Nappi
E
E
Naryshkin
Y
Y
Nass
A
A
Negodaev
M
M
Nowak
W-D
WD
Oganessyan
K
K
Ohsuga
H
H
Orlandi
G
G
Pickert
N
N
Potashov
S
S
Potterveld
D H
DH
Raithel
M
M
Reggiani
D
D
Reimer
P E
PE
Reischl
A
A
Reolon
A R
AR
Riedl
C
C
Rith
K
K
Rosner
G
G
Rostomyan
A
A
Rubacek
L
L
Ryckbosch
D
D
Salomatin
Y
Y
Sanjiev
I
I
Savin
I
I
Scarlett
C
C
Schäfer
A
A
Schill
C
C
Schnell
G
G
Schüler
K P
KP
Schwind
A
A
Seele
J
J
Seidl
R
R
Seitz
B
B
Shanidze
R
R
Shearer
C
C
Shibata
T-A
TA
Shutov
V
V
Simani
M C
MC
Sinram
K
K
Stancari
M
M
Statera
M
M
Steffens
E
E
Steijger
J J M
JJ
Stewart
J
J
Stösslein
U
U
Tait
P
P
Tanaka
H
H
Taroian
S
S
Tchuiko
B
B
Terkulov
A
A
Tkabladze
A
A
Trzcinski
A
A
Tytgat
M
M
Vandenbroucke
A
A
Van Der Nat
P
P
Van Der Steenhoven
G
G
Vetterli
M C
MC
Vikhrov
V
V
Vincter
M G
MG
Visser
J
J
Vogel
C
C
Vogt
M
M
Volmer
J
J
Weiskopf
C
C
Wendland
J
J
Wilbert
J
J
Ybeles Smit
G
G
Yen
S
S
Zihlmann
B
B
Zohrabian
H
H
Zupranski
P
P