arxiv: 1310.5081 · v2 · submitted 2013-10-18 · ✦ hep-ex · nucl-ex
Recognition: unknown
Beam-helicity asymmetry in associated electroproduction of real photons ep to eγ π N in the Delta-resonance region
The HERMES Collaboration: A. Airapetian
,
N. Akopov
,
E.C. Aschenauer
,
W. Augustyniak
,
R. Avakian
,
A. Avetissian
,
E. Avetisyan
,
H.P. Blok
show 108 more authors
H. B\"ottcher
A. Borissov
J. Bowles
I. Brodski
V. Bryzgalov
J. Burns
G.P. Capitani
E. Cisbani
G. Ciullo
M. Contalbrigo
P.F. Dalpiaz
W. Deconinck
R. De Leo
E. De Sanctis
M. Diefenthaler
P. Di Nezza
M. D\"uren
M. Ehrenfried
G. Elbakian
F. Ellinghaus
E. Etzelm\"uller
R. Fabbri
S. Frullani
G. Gapienko
V. Gapienko
J. Garay Garc\'ia
F. Garibaldi
G. Gavrilov
V. Gharibyan
F. Giordano
S. Gliske
M. Hartig
D. Hasch
Y. Holler
I. Hristova
A. Ivanilov
H.E. Jackson
S. Joosten
R. Kaiser
G. Karyan
T. Keri
E. Kinney
A. Kisselev
V. Korotkov
V. Kozlov
P. Kravchenko
V.G. Krivokhijine
L. Lagamba
L. Lapik\'as
I. Lehmann
P. Lenisa
W. Lorenzon
X.-G. Lu
B.-Q. Ma
D. Mahon
N.C.R. Makins
S.I. Manaenkov
Y. Mao
B. Marianski
H. Marukyan
C.A. Miller
Y. Miyachi
A. Movsisyan
V. Muccifora
M. Murray
A. Mussgiller
Y. Naryshkin
A. Nass
M. Negodaev
W.-D. Nowak
L.L. Pappalardo
R. Perez-Benito
A. Petrosyan
P.E. Reimer
A.R. Reolon
C. Riedl
K. Rith
G. Rosner
A. Rostomyan
J. Rubin
D. Ryckbosch
Y. Salomatin
A. Sch\"afer
G. Schnell
B. Seitz
T.-A. Shibata
M. Stahl
M. Statera
E. Steffens
J.J.M. Steijger
J. Stewart
F. Stinzing
S. Taroian
A. Terkulov
R. Truty
A. Trzcinski
M. Tytgat
Y. Van Haarlem
C. Van Hulse
V. Vikhrov
I. Vilardi
S. Wang
S. Yaschenko
Z. Ye
S. Yen
V. Zagrebelnyy
B. Zihlmann
P. Zupranski
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classification
✦ hep-ex
nucl-ex
keywords
asymmetrygammaamplitudesassociatedbeam-helicitydeltaelectroproductionphotons
read the original abstract
The beam-helicity asymmetry in associated electroproduction of real photons, $ep\to e\gamma \pi N$, in the $\Delta$(1232)-resonance region is measured using the longitudinally polarized HERA positron beam and an unpolarized hydrogen target. Azimuthal Fourier amplitudes of this asymmetry are extracted separately for two channels, $ep\to e\gamma \pi^0 p$ and $ep\to e\gamma \pi^+ n$, from a data set collected with a recoil detector. All asymmetry amplitudes are found to be consistent with zero.
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