Measurements of the Proton and Deuteron Spin Structure Function g2 and Asymmetry A2

Abe, K.; Akagi, T.; Anthony, P.L.; Antonov, R.; Arnold, R.G.; Averett, T.; Band, H.R.; Bauer, J.M.; Borel, H.; Bosted, P.E.; Breton, V.; Button-Shafer, J.; Chen, J.P.; Chump, T.E.; Clendenin, J.; Comptour, C.; Coulter, K.P.; Court, G.; Crabb, D.; Daoudi, M.; Day, D.; Dietrich, F.S.; Dunne, J.; Dutz, H.; Erbacher, R.; Fellbaum, J.; Feltham, A.; Fonvieille, H.; Frlez, E.; Garvey, D.; Gearhart, R.; Gomez, J.; Grenier, P.; Griffioen, K.A.; Hoibraten, S.; Hughes, E.W.; Hyde-Wright, C.; Johnson, J.R.; Kawall, D.; Klein, A.; Kuhn, S.E.; Kuriki, M.; Lindgren, R.; Liu, T.J.; Lombard-Nelsen, R.M.; Marroncle, J.; Maruyama, T.; Maruyama, X.K.; McCarthy, J.; Meyer, W.; Meziani, Z.-E.; Minehart, R.; Mitchell, J.; Morgenstern, J.; Petratos, G.G.; Pitthan, R.; Pocanic, D.; Prepost, R.; Prescott, C.; Raines, P.; Raue, B.; Reyna, D.; Rijllart, A.; Roblin, Y.; Rochester, L.S.; Rock, S.E.; Rondon, O.A.; Sick, I.; Smith, L.C.; Smith, T.B.; Spengos, M.; St. Lorant, S.; Staley, F.; Steiner, P.; Stuart, L.M.; Suekane, F.; Szalata, Z.M.; Tang, H.; Terrien, Y.; The E143 Collaboration; Usher, T.; Walz, D.; White, J.L.; Witte, K.; Young, C.C.; Youngman, B.; Yuta, H.; Zapalac, G.; Zihlmann, B.; Zimmermann, D.

research

Measurements of the Proton and Deuteron Spin Structure Function g2 and Asymmetry A2

Authors: K. Abe
T. Akagi
P.L. Anthony
R. Antonov
R.G. Arnold
T. Averett
H.R. Band
J.M. Bauer
H. Borel
P.E. Bosted
V. Breton
J. Button-Shafer
J.P. Chen
T.E. Chump
J. Clendenin
C. Comptour
K.P. Coulter
G. Court
D. Crabb
M. Daoudi
D. Day
F.S. Dietrich
J. Dunne
H. Dutz
R. Erbacher
J. Fellbaum
A. Feltham
H. Fonvieille
E. Frlez
D. Garvey
R. Gearhart
J. Gomez
P. Grenier
K.A. Griffioen
S. Hoibraten
E.W. Hughes
C. Hyde-Wright
J.R. Johnson
D. Kawall
A. Klein
S.E. Kuhn
M. Kuriki
R. Lindgren
T.J. Liu
R.M. Lombard-Nelsen
J. Marroncle
T. Maruyama
X.K. Maruyama
J. McCarthy
W. Meyer
Z.-E. Meziani
R. Minehart
J. Mitchell
J. Morgenstern
G.G. Petratos
R. Pitthan
D. Pocanic
R. Prepost
C. Prescott
P. Raines
B. Raue
D. Reyna
A. Rijllart
Y. Roblin
L.S. Rochester
S.E. Rock
O.A. Rondon
I. Sick
L.C. Smith
T.B. Smith
M. Spengos
S. St. Lorant
F. Staley
P. Steiner
L.M. Stuart
F. Suekane
Z.M. Szalata
H. Tang
Y. Terrien
The E143 Collaboration
T. Usher
D. Walz
J.L. White
K. Witte
C.C. Young
B. Youngman
H. Yuta
G. Zapalac
B. Zihlmann
D. Zimmermann
Publication date: 1 November 1995
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Abstract

Submitted to Physical Review Letters. The article of record may be found at http://dx.doi.org/10.1103/PhysRevLett.76.587.We have measured proton and deuteron virtual photon-nucleon asymmetries Ap2 and Ad2 and structure functions gp2 and gd2 over the range 0.03<x<0.8 and 1.3<Q2<10(GeV/c)2 by inelastically scattering polarized electrons off polarized ammonia targets. Results for A2 are significantly smaller than the positivity limit R‾‾√ for both targets. Within experimental precision the g2 data are well described by the twist-2 contribution, gWW2. Twist-3 matrix elements have been extracted and are compared to theoretical predictions.Work supported in part by Department of Energy contract DE-AC03-76SF00515