Limit on the d / u asymmetry of the nucleon sea from Drell-Yan production

Journal Article · Mon Sep 21 00:00:00 EDT 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.69.1726· OSTI ID:7002042

McGaughey, P L; Moss, J M; Alde, D M; Baer, H W; Carey, T A; Garvey, G T; Klein, A; Lee, C; Leitch, M J; Lillberg, J W; Mishra, C S; Peng, J C ^[1]; Brown, C N; Cooper, W E; Hsiung, Y B ^[2]; Adams, M R ^[3]; Guo, R; Kaplan, D M ^[4]; McCarthy, R L ^[5]; Danner, G ; Wang, M J ^[6]; Barlett, M L; Hoffmann, G W ^[7]

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1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
2. Fermilab, Batavia, Illinois 60510 (United States)
3. University of Illinois at Chicago, Chicago, Illinois 60680 (United States)
4. Northern Illinois University, DeKalb, Illinois 60115 (United States)
5. State University of New York at Stony Brook, Stony Brook, New York 11794-3800 (United States)
6. Case Western Reserve University, Cleveland, Ohio 44106 (United States) Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
7. University of Texas, Austin, Texas 78712 (United States)

We present an analysis of 800-GeV proton-induced Drell-Yan production data from isoscalar targets {sup 2}H and C, and from W, which has a large neutron excess. The ratio of cross sections per nucleon, {ital R}{minus}{sigma}{sub W}/{sigma}{sub IS}, is sensitive to the difference between the {ital {bar d}}({ital x}) and {ital {bar u}}({ital x}) structure functions of the proton. We find that {ital R} is close to unity in the range 0.04{le}{ital x}{le}0.27, allowing upper limits to be set on the {ital {bar d}}-{ital {bar u}} asymmetry. Additionally, the shape of the differential cross section {ital m}{sup 3} {ital d}{sup 2}{sigma}/{ital dx}{sub {ital F}} {ital dm} for {sup 2}H at {ital x}{sub {ital F}}{approx}0 shows no evidence of an asymmetric sea in the proton. We examine the implications of these data for various models of the violation of the Gottfried sum rule in deep-inelastic lepton scattering.

• OSTI ID: 7002042
• Journal Information: Physical Review Letters; (United States), Vol. 69:12; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PARTON MODEL
PARTICLE PRODUCTION
PROTON REACTIONS
CARBON
DATA ANALYSIS
DEEP INELASTIC SCATTERING
DEUTERIUM TARGET
DIFFERENTIAL CROSS SECTIONS
DRELL MODEL
GEV RANGE 100-1000
PARTICLE KINEMATICS
STRUCTURE FUNCTIONS
SUM RULES
TUNGSTEN
BARYON REACTIONS
CHARGED-PARTICLE REACTIONS
COMPOSITE MODELS
CROSS SECTIONS
ELEMENTS
ENERGY RANGE
EQUATIONS
FUNCTIONS
GEV RANGE
HADRON REACTIONS
INELASTIC SCATTERING
INTERACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
MATHEMATICAL MODELS
METALS
NONMETALS
NUCLEAR REACTIONS
NUCLEON REACTIONS
PARTICLE INTERACTIONS
PARTICLE MODELS
SCATTERING
TARGETS
TRANSITION ELEMENTS
662340* - Hadron Interactions- (1992-)
662230 - Quantum Chromodynamics- (1992-)