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

Journal Article · Mon Jan 16 04:00:00 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), Journal Name: Physical Review Letters; (United States) Vol. 74:3; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

662130 -- General Theory of Particles & Fields-- S-Matrix Theory
Relativistic Scattering Theory-- (1992-)
662330* -- Photon & Charged-Lepton Interactions with Hadrons-- (1992)
662410 -- Properties of Baryons & Baryon Resonances-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMMONIA
ANGULAR MOMENTUM
BARYONS
BEAMS
CHARGED-PARTICLE REACTIONS
DEEP INELASTIC SCATTERING
ELECTRON 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
POLARIZED BEAMS
POLARIZED TARGETS
PROTONS
SCATTERING
SPIN
STRUCTURE FUNCTIONS
SUM RULES
TARGETS