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

Journal Article · Mon Jan 22 00:00:00 EST 1996 · Physical Review Letters

OSTI ID:802132

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; Chupp, 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; Marnyama, T; Marnyama, X K; McCarthy, J; Meyer, W; Meziani, Z -E; Minehart, R; Mitchell, J; Morgenstern, J; Petratos, G G; Pitthan, R; Pocanic, D; Prescott, C; Prepost, R; 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; Staley, F; Steiner, P; Lorant, S St; Stuart, L M; Suekane, F; Szalata, Z M; Tang, H; Terrien, Y; Usher, T; Walz, D; White, J L; Witte, K; Young, C C; Youngman, B; Yuta, H; Zapalac, G; Zihlmann, B; Zimmermann, D

We have measured proton and deuteron virtual photon-nucleon asymmetries A{sup p}{sub 2} and A{sup d}{sub 2} and structure functions g{sup p}{sub 2} and g{sup d}{sub 2} over the range 0.03 < x < 0.8 and 1.3 < Q{sup 2} < 10 (GeV/c){sup 2} by inelastically scattering polarized electrons off polarized ammonia targets. Results for A{sub 2} are significantly smaller than the positivity limit (sqrt)R for both targets. Within experimental precision the g{sub 2} data are well described by the twist-2 contribution, g{sup ww}{sub 2}. Twist-3 matrix elements have been extracted and are compared to theoretical predictions.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 802132
• Report Number(s): CEBAF-PR-96-017; DOE/ER/40150-2244; PRLTAO; TRN: US200223%%905
• Journal Information: Physical Review Letters, Vol. 76; Other Information: PBD: 22 Jan 1996; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMMONIA
ASYMMETRY
DEUTERONS
ELECTRONS
MATRIX ELEMENTS
PROTONS
SCATTERING
SPIN
STRUCTURE FUNCTIONS
TARGETS