Measurement of the LIght Quark Flavor Asymmetry in the Nucleon Sea

Conference · Thu Jul 23 00:00:00 EDT 1998

OSTI ID:762866

Peng, J C; Awes, T C; Beddo, M E; Brooks, M L; Brown, C N; Bush, J D; Carey, T A; Chang, T H; Cooper, W E; Gagliardi, C A; Garvey, G T; Geesaman, D F; Hawker, E A; He, X C; Isenhower, L D; Kaufman, S B; Kaplan, D M; Kirk, P N; Koetke, D D; Kyle, G ; Lee, D M; Lee, W M; Leitch, M J; Makins, N; McGaughey, P L; Moss, J M; Mueller, B A; Nord, P M; Park, B K; Papavassiliou, V; Petitt, G; Reimer, P E; Sadler, M E; Stankus, P W; Sondheim, W E; Thompson, T N; Towell, R S; Tribble, R E; Vasiliev, M A; Wang, Y C; Wang, Z F; Webb, J C; Willis, J L; Wise, D K; Young, G R

The Drell-Yan cross section ratios, s(p+d)/s(p+p), measured in Fermilab E866, have led to the first determination of d(x)/u(x), d(x)-(x), and the integral of d(x)-u(x) for the proton over the range 0.02 < x < 0.345. The E866 results are compared with predictions based on parton distribution functions and various theoretical models. The relationship between the E866 results and the NMC measurements of the Gottfried integral is discussed. The agreement between the E866 results and models employing virtual mesons indicates these non-perturbative processes play an important role in the origin of the d, u asymmetry in the nucleon sea.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 762866
• Report Number(s): LA-UR-98-4410; TRN: US0100136
• Resource Relation: Conference: XXIX International Conference on High Energy Physics, Vancouver, British Columbia (CA), 07/23/1998--07/28/1998; Other Information: PBD: 23 Jul 1998
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ASYMMETRY
CROSS SECTIONS
DISTRIBUTION FUNCTIONS
HIGH ENERGY PHYSICS
NUCLEONS
QUARKS
SEAS