Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-10-15
AIPConf.Proc.892:448-451,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
To appear in proceedings of Quark Confinement and the Hadron Spectrum VII Conference, Ponta Delgada, Portugal, 2-7 September 2
Scientific paper
10.1063/1.2714439
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)^2.
CLAS Collaboration
Kulagin S.
Osipenko Mikhail
Ricco Giovanni
Simula Silvano
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