Precision measurement of the deuteron spin structure function {ital g}{sup {ital d}}{sub 1}

Journal Article · Mon Jul 03 00:00:00 EDT 1995 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.75.25· OSTI ID:81917

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; Lombard-Nelsen, R M; Marroncle, J; Maruyama, T; Maruyama, X K; McCarthy, J; Meyer, W; Meziani, Z; 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; 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 ^[1]

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1. The American University, Washington, D.C. 20016 (United States)

We report on a high-statistics measurement of the deuteron spin structure function {ital g}{sup {ital d}}{sub 1} at a beam energy of 29 GeV in the kinematic range 0.029{lt}{ital x}{lt}0.8 and 1{lt}{ital Q}{sup 2}{lt}10 (GeV/{ital c}){sup 2}. The integral {Gamma}{sup {ital d}}{sub 1}={integral}{sup 1}{sub 0}{ital g}{sup {ital d}}{sub 1}{ital dx} evaluated at fixed {ital Q}{sup 2}=3 (GeV/{ital c}){sup 2} gives 0.042{plus_minus}0.003(stat){plus_minus}0.004(syst). Combining this result with our earlier measurement of {ital g}{sup {ital p}}{sub 1}, we find {Gamma}{sup {ital p}}{sub 1}{minus}{Gamma}{sup {ital n}}{sub 1}=0.163{plus_minus}0.010(stat){plus_minus}0.016(syst), which agrees with the prediction of the Bjorken sum rule with {ital O}({alpha}{sup 3}{sub {ital s}}) corrections, {Gamma}{sup {ital p}}{sub 1}{minus}{Gamma}{sup {ital n}}{sub 1}=0.171{plus_minus}0.008. We find the quark contribution to the proton helicity to be {Delta}{ital q}=0.30{plus_minus}0.06.

• Research Organization: Thomas Jefferson National Accelerator Facility
• DOE Contract Number: AC05-84ER40150; W-7405-ENG-48; AC03-76SF00515; FG03-88ER40439
• OSTI ID: 81917
• Journal Information: Physical Review Letters, Vol. 75, Issue 1; Other Information: PBD: 3 Jul 1995
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
DEUTERONS
STRUCTURE FUNCTIONS
SPIN
GEV RANGE 10-100
SUM RULES
CORRECTIONS
PROTONS
HELICITY
QUANTUM CHROMODYNAMICS
SU-3 GROUPS
FLAVOR