Neutron structure function moments at leading twist

Conference · Sun Oct 15 04:00:00 EDT 2006

OSTI ID:893780

Osipenko, M; Simula, S; Kulagin, S; Ricco, G

The experimental data on F2 structure functions of the proton and deuteron were used to construct their moments. In particular, recent measurements performed with CLAS detector at Jefferson Lab allowed to extend our knowledge of structure functions in the large-x region. The phenomenological analysis of these experimental moments in terms of the Operator Product Expansion permitted to separate the leading and higher twist contributions. Applying nuclear corrections to extracted deuteron moments we obtained the contribution of the neutron. Combining leading twist moments of the neutron and proton we found d/u ratio at x->1 approaching 0, although 1/5 value could not be excluded. The twist expansion analysis suggests that the contamination of higher twists influences the extraction of the d/u ratio at x->1 even at Q2-scale as large as 12 (GeV/c){sup 2}.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA
• Sponsoring Organization: USDOE - Office of Energy Research (ER)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 893780
• Report Number(s): JLAB-PHY-06-540; DOE/ER/40150-4073; hep-ph/0610182
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BAG MODEL
CONTAMINATION
DEUTERONS
HADRONS
NEUTRONS
OPERATOR PRODUCT EXPANSION
PROTONS
STRUCTURE FUNCTIONS