Measurement of deeply virtual compton scattering beam-spin asymmetries.
The beam-spin asymmetries in the hard exclusive electroproduction of photons on the proton (e p-->epgamma) were measured over a wide kinematic range and with high statistical accuracy. These asymmetries result from the interference of the Bethe-Heitler process and of deeply virtual Compton scattering. Over the whole kinematic range (x(B) from 0.11 to 0.58, Q2 from 1 to 4.8 GeV2, -t from 0.09 to 1.8 GeV2), the azimuthal dependence of the asymmetries is compatible with expectations from leading-twist dominance, A approximately a sinphi/(1+c cosphi). This extensive set of data can thus be used to constrain significantly the generalized parton distributions of the nucleon in the valence quark sector.
Girod
F X
FX
CEA-Saclay, Service de Physique Nucléaire, 91191 Gif-sur-Yvette, France.
Niyazov
R A
RA
Avakian
H
H
Ball
J
J
Bedlinskiy
I
I
Burkert
V D
VD
De Masi
R
R
Elouadrhiri
L
L
Garçon
M
M
Guidal
M
M
Jo
H S
HS
Joo
K
K
Kubarovsky
V
V
Kuleshov
S V
SV
MacCormick
M
M
Niccolai
S
S
Pogorelko
O
O
Sabatié
F
F
Stepanyan
S
S
Stoler
P
P
Ungaro
M
M
Zhao
B
B
Amaryan
M J
MJ
Ambrozewicz
P
P
Anghinolfi
M
M
Asryan
G
G
Bagdasaryan
H
H
Baillie
N
N
Ball
J P
JP
Baltzell
N A
NA
Batourine
V
V
Battaglieri
M
M
Bellis
M
M
Benmouna
N
N
Berman
B L
BL
Biselli
A S
AS
Blaszczyk
L
L
Bouchigny
S
S
Boiarinov
S
S
Bradford
R
R
Branford
D
D
Briscoe
W J
WJ
Brooks
W K
WK
Bültmann
S
S
Butuceanu
C
C
Calarco
J R
JR
Careccia
S L
SL
Carman
D S
DS
Casey
L
L
Chen
S
S
Cheng
L
L
Cole
P L
PL
Collins
P
P
Coltharp
P
P
Crabb
D
D
Crede
V
V
Dashyan
N
N
De Sanctis
E
E
De Vita
R
R
Degtyarenko
P V
PV
Deur
A
A
Dharmawardane
K V
KV
Dickson
R
R
Djalali
C
C
Dodge
G E
GE
Donnelly
J
J
Doughty
D
D
Dugger
M
M
Dzyubak
O P
OP
Egiyan
H
H
Egiyan
K S
KS
El Fassi
L
L
Eugenio
P
P
Fedotov
G
G
Feldman
G
G
Funsten
H
H
Gavalian
G
G
Gilfoyle
G P
GP
Giovanetti
K L
KL
Goetz
J T
JT
Gonenc
A
A
Gothe
R W
RW
Griffioen
K A
KA
Guler
N
N
Guo
L
L
Gyurjyan
V
V
Hafidi
K
K
Hakobyan
H
H
Hanretty
C
C
Hersman
F W
FW
Hicks
K
K
Hleiqawi
I
I
Holtrop
M
M
Hyde
C E
CE
Ilieva
Y
Y
Ireland
D G
DG
Ishkhanov
B S
BS
Isupov
E L
EL
Ito
M M
MM
Jenkins
D
D
Johnstone
J R
JR
Juengst
H G
HG
Kalantarians
N
N
Kellie
J D
JD
Khandaker
M
M
Kim
W
W
Klein
A
A
Klein
F J
FJ
Klimenko
A V
AV
Kossov
M
M
Krahn
Z
Z
Kramer
L H
LH
Kuhn
J
J
Kuhn
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SE
Lachniet
J
J
Laget
J M
JM
Langheinrich
J
J
Lawrence
D
D
Lee
T
T
Livingston
K
K
Lu
H Y
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Markov
N
N
Mattione
P
P
Mazouz
M
M
McKinnon
B
B
Mecking
B A
BA
Mestayer
M D
MD
Meyer
C A
CA
Mibe
T
T
Michel
B
B
Mikhailov
K
K
Mirazita
M
M
Miskimen
R
R
Mokeev
V
V
Moriya
K
K
Morrow
S A
SA
Moteabbed
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M
Munevar
E
E
Mutchler
G S
GS
Nadel-Turonski
P
P
Nasseripour
R
R
Niculescu
G
G
Niculescu
I
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Niczyporuk
B B
BB
Niroula
M R
MR
Nozar
M
M
Osipenko
M
M
Ostrovidov
A I
AI
Park
K
K
Pasyuk
E
E
Paterson
C
C
Anefalos Pereira
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Pierce
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J
Pivnyuk
N
N
Pocanic
D
D
Pozdniakov
S
S
Price
J W
JW
Procureur
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S
Prok
Y
Y
Protopopescu
D
D
Raue
B A
BA
Ricco
G
G
Ripani
M
M
Ritchie
B G
BG
Rosner
G
G
Rossi
P
P
Salamanca
J
J
Salgado
C
C
Santoro
J P
JP
Sapunenko
V
V
Schumacher
R A
RA
Serov
V S
VS
Sharabian
Y G
YG
Sharov
D
D
Shvedunov
N V
NV
Smith
E S
ES
Smith
L C
LC
Sober
D I
DI
Sokhan
D
D
Stavinsky
A
A
Stepanyan
S S
SS
Stokes
B E
BE
Strakovsky
I I
II
Strauch
S
S
Taiuti
M
M
Tedeschi
D J
DJ
Tkabladze
A
A
Tkachenko
S
S
Tur
C
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Vineyard
M F
MF
Vlassov
A V
AV
Voutier
E
E
Watts
D P
DP
Weinstein
L B
LB
Weygand
D P
DP
Williams
M
M
Wolin
E
E
Wood
M H
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Yegneswaran
A
A
Zana
L
L
Zhang
J
J
Zhao
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