Precision measurement of the proton spin structure function [ital g][sup [ital p]][sub 1]

Journal Article · Mon Jan 16 00:00:00 EST 1995 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.74.346· OSTI ID:6853144

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; 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; Su,

We have measured the ratio [ital g][sup [ital p]][sub 1]/[ital F][sup [ital p]][sub 1] over the range 0.029[lt][ital x][lt]0.8 and 1.3[lt][ital Q][sup 2][lt]10 (GeV/[ital c])[sup 2] using deep-inelastic scattering of polarized electrons from polarized ammonia. An evaluation of the integral [integral][ital g][sup [ital p]][sub 1]([ital x],[ital Q][sup 2])[ital dx] at fixed [ital Q][sup 2]=3 (GeV/[ital c])[sup 2] yields 0.127[plus minus]0.004(stat)[plus minus]0.010(syst), in agreement with previous experiments, but well below the Ellis-Jaffe sum rule prediction of 0.160[plus minus]0.006. In the quark-parton model, this implies [Delta][ital q]=0.27[plus minus]0.10.

• DOE Contract Number: AC05-84ER40150; W-7405-ENG-48; AC03-76SF00515; FG03-88ER40439
• OSTI ID: 6853144
• Journal Information: Physical Review Letters; (United States), Vol. 74:3; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PROTONS
STRUCTURE FUNCTIONS
AMMONIA
DEEP INELASTIC SCATTERING
ELECTRON REACTIONS
POLARIZED BEAMS
POLARIZED TARGETS
SPIN
SUM RULES
ANGULAR MOMENTUM
BARYONS
BEAMS
CHARGED-PARTICLE REACTIONS
ELEMENTARY PARTICLES
EQUATIONS
FERMIONS
FUNCTIONS
HADRONS
HYDRIDES
HYDROGEN COMPOUNDS
INELASTIC SCATTERING
INTERACTIONS
LEPTON REACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NUCLEAR REACTIONS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
SCATTERING
TARGETS
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662410 - Properties of Baryons & Baryon Resonances- (1992-)