Observation of exclusive DVCS in polarized electron beam asymmetry
  measurements

Adams, G.S.; Anciant, E.; Anghinolfi, M.; Asavapibhop, B.; Audit, G.; Auger, T.; Avakian, H.; Ball, J.; Barrow, S.; Battaglieri, M.; Beard, K.; Bektasoglu, M.; Berman, B.L.; Bertin, P.Y.; Bianchi, N.; Biselli, A.; Boiarinov, S.; Bonner, B.E.; Bouchigny, S.; Branford, D.; Briscoe, W.J.; Brooks, W.K.; Burkert, V.D.; Calarco, J.R.; Carman, D.S.; Carnahan, B.; Cetina, C.; Ciciani, L.; Cole, P.L.; Coleman, A.; Cords, D.; Corvisiero, P.; Crabb, D.; Crannell, H.; Cummings, J.; De Sanctis, E.; De Vita, R.; Degtiarenko, P.V.; Denizli, H.; Dennis, L.C.; Dharmawardane, K.V.; Dhuga, K.S.; Djalali, C.; Dodge, G.E.; Dore, D.; Doughty, D.; Dragovitsch, P.; Dytman, S.; Eckhause, M.; Egiyan, H.; Egiyan, K.S.; Elouadrhiri, L.; Empl, A.; Fatemi, R.; Feldman, G.; Feuerbach, R.J.; Ficenec, J.; Fissum, K.; Forest, T.A.; Freyberger, A.P.; Funsten, H.; Gaff, S.; Gai, M.; Garcon, M.; Gavalian, G.; Gilad, S.; Gilfoyle, G.P.; Giovanetti, K.; Girard, Pascal; Griffioen, K.A.; Guidal, M.; Guillo, M.; Gyurjyan, V.; Hadjidakis, C.; Hardie, J.; Heddle, D.; Heimberg, P.; Hersman, F.W.; Hicks, K.; Hicks, R.S.; Holtrop, M.; Hu, J.; Hyde-Wright, C.E.; Ito, M.M.; Jenkins, D.; Joo, K.; Kelley, J.; Khandaker, M.; Kim, D.H.; Kim, K.; Kim, K.Y.; Kim, W.; Klein, A.; Klein, F.J.; Klusman, M.; Kossov, M.; Kramer, L.H.; Kuhn, S.E.; Laget, J.M.; Lawrence, D.; Longhi, A.; Lukashin, K.; Manak, J.J.; Marchand, C.; Maximon, L.; McAleer, S.; McCarthy, J.; McNabb, J.W.C.; Mecking, B.A.; Mestayer, M.D.; Meyer, C.A.; Mikhailov, K.; Minehart, R.; Mirazita, M.; Miskimen, R.; Morand, L.; Muccifora, V.; Mueller, J.; Murphy, L.; Mutchler, G.S.; Napolitano, J.; Nelson, S.; Niccolai, S.; Niculescu, G.; Niculescu, I.; Niyazov, R.A.; O'Brien, J.T.; O'Rielly, G.; Opper, A.; Park, K.; Pasyuk, E.; Peterson, G.A.; Philips, S.; Pivnyuk, N.; Pocanic, D.; Pogorelko, O.; Polli, E.; Popa, I.; Pozdniakov, S.; Preedom, B.M.; Price, J.W.; Protopopescu, D.; Qin, L.M.; Raue, B.A.; Reolon, A.R.; Riccardi, G.; Ricco, G.; Ripani, M.; Ritchie, B.G.; Ronchetti, F.; Rossi, P.; Rowntree, D.; Rubin, P.D.; Sabatie, F.; Sabourov, K.; Salgado, C.W.; Sapunenko, V.; Schumacher, R.A.; Serov, V.; Shafi, A.; Sharabian, Yu.G.; Shaw, J.; Simionatto, S.; Skabelin, A.; Smith, E.S.; Smith, L.C.; Sober, D.I.; Stavinsky, A.; Stepanyan, S.; Stoler, P.; Strakovsky, I.I.; Suleiman, R.; Taiuti, M.; Taylor, S.; Tedeschi, D.; Thompson, R.; Todor, L.; Vineyard, M.F.; Vlassov, A.; Wang, K.; Weinstein, L.B.; Weller, H.; Welsh, R.; Weygand, D.P.; Whisnant, S.; Wolin, E.; Yanik, L.; Yegneswaran, A.; Yun, J.; Zhang, B.; Zhao, J.; Zhou, Z.

research

Observation of exclusive DVCS in polarized electron beam asymmetry measurements

Authors: G.S. Adams
E. Anciant
M. Anghinolfi
B. Asavapibhop
G. Audit
T. Auger
H. Avakian
J. Ball
S. Barrow
M. Battaglieri
K. Beard
M. Bektasoglu
B.L. Berman
P.Y. Bertin
N. Bianchi
A. Biselli
S. Boiarinov
B.E. Bonner
S. Bouchigny
D. Branford
W.J. Briscoe
W.K. Brooks
V.D. Burkert
J.R. Calarco
D.S. Carman
B. Carnahan
C. Cetina
L. Ciciani
P.L. Cole
A. Coleman
D. Cords
P. Corvisiero
D. Crabb
H. Crannell
J. Cummings
E. De Sanctis
R. De Vita
P.V. Degtiarenko
H. Denizli
L.C. Dennis
K.V. Dharmawardane
K.S. Dhuga
C. Djalali
G.E. Dodge
D. Dore
D. Doughty
P. Dragovitsch
S. Dytman
M. Eckhause
H. Egiyan
K.S. Egiyan
L. Elouadrhiri
A. Empl
R. Fatemi
G. Feldman
R.J. Feuerbach
J. Ficenec
K. Fissum
T.A. Forest
A.P. Freyberger
H. Funsten
S. Gaff
M. Gai
M. Garcon
G. Gavalian
S. Gilad
G.P. Gilfoyle
K. Giovanetti
Pascal Girard
K.A. Griffioen
M. Guidal
M. Guillo
V. Gyurjyan
C. Hadjidakis
J. Hardie
D. Heddle
P. Heimberg
F.W. Hersman
K. Hicks
R.S. Hicks
M. Holtrop
J. Hu
C.E. Hyde-Wright
M.M. Ito
D. Jenkins
K. Joo
J. Kelley
M. Khandaker
D.H. Kim
K. Kim
K.Y. Kim
W. Kim
A. Klein
F.J. Klein
M. Klusman
M. Kossov
L.H. Kramer
S.E. Kuhn
J.M. Laget
D. Lawrence
A. Longhi
K. Lukashin
J.J. Manak
C. Marchand
L. Maximon
S. McAleer
J. McCarthy
J.W.C. McNabb
B.A. Mecking
M.D. Mestayer
C.A. Meyer
K. Mikhailov
R. Minehart
M. Mirazita
R. Miskimen
L. Morand
V. Muccifora
J. Mueller
L. Murphy
G.S. Mutchler
J. Napolitano
S. Nelson
S. Niccolai
G. Niculescu
I. Niculescu
R.A. Niyazov
J.T. O'Brien
G. O'Rielly
A. Opper
K. Park
E. Pasyuk
G.A. Peterson
S. Philips
N. Pivnyuk
D. Pocanic
O. Pogorelko
E. Polli
I. Popa
S. Pozdniakov
B.M. Preedom
J.W. Price
D. Protopopescu
L.M. Qin
B.A. Raue
A.R. Reolon
G. Riccardi
G. Ricco
M. Ripani
B.G. Ritchie
F. Ronchetti
P. Rossi
D. Rowntree
P.D. Rubin
F. Sabatie
K. Sabourov
C.W. Salgado
V. Sapunenko
R.A. Schumacher
V. Serov
A. Shafi
Yu.G. Sharabian
J. Shaw
S. Simionatto
A. Skabelin
E.S. Smith
L.C. Smith
D.I. Sober
A. Stavinsky
S. Stepanyan
P. Stoler
I.I. Strakovsky
R. Suleiman
M. Taiuti
S. Taylor
D. Tedeschi
R. Thompson
L. Todor
M.F. Vineyard
A. Vlassov
K. Wang
L.B. Weinstein
H. Weller
R. Welsh
D.P. Weygand
S. Whisnant
E. Wolin
L. Yanik
A. Yegneswaran
J. Yun
B. Zhang
J. Zhao
Z. Zhou
Publication date: 1 January 2001
Publisher: 'American Physical Society (APS)'
Doi

Abstract

We report the first results of the beam spin asymmetry measured in the reaction e + p -> e + p + gamma at a beam energy of 4.25 GeV. A large asymmetry with a sin(phi) modulation is observed, as predicted for the interference term of Deeply Virtual Compton Scattering and the Bethe-Heitler process. The amplitude of this modulation is alpha = 0.202 +/- 0.028. In leading-order and leading-twist pQCD, the alpha is directly proportional to the imaginary part of the DVCS amplitude.Comment: 6 pages, 5 figure

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