Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-10-04
Nucl.Phys.Proc.Suppl.174:23-26,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
Proceedings of 13th International QCD Conference (QCD 06), Montpellier, France, July 3-7th 2006
Scientific paper
10.1016/j.nuclphysbps.2007.08.07
Experimental data on the F2 structure functions of the proton and deuteron, including recent results from CLAS at Jefferson Lab, have been used to construct their n<=12 moments. A comprehensive analysis of the moments in terms of the operator product expansion has been performed to separate the moments into leading and higher twist contributions. Particular attention was paid to the issue of nuclear corrections in the deuteron, when extracting the neutron moments from data. The difference between the proton and neutron moments was compared directly with lattice QCD simulations. Combining leading twist moments of the neutron and proton we found the d/u ratio at x->1 approaching 0, although the precision of the data did not allow to exclude the 1/5 value. The higher twist components of the proton and neutron moments suggest that multi-parton correlations are isospin independent.
CLAS Collaboration
Kulagin S.
Melnitchouk Wally
Osipenko Mikhail
Ricco Giovanni
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