Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-09-17
Phys.Lett. B612 (2005) 5-12
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 4 figures, to be published in PLB. Effect of Fermimotion is included. Accordingly, 4 figures as well as the text wer
Scientific paper
10.1016/j.physletb.2005.02.056
Effect of bound nucleon internal structure change on nuclear structure functions is investigated based on local quark-hadron duality. The bound nucleon structure functions calculated for charged-lepton and (anti)neutrino scattering are all enhanced in symmetric nuclear matter at large Bjorken-$x$ ($x \agt 0.85$) relative to those in a free nucleon. This implies that a part of the enhancement observed in the nuclear structure function $F_2$ (in the resonance region) at large Bjorken-$x$ (the EMC effect) is due to the effect of the bound nucleon internal structure change. However, the $x$ dependence for the charged-lepton and (anti)neutrino scattering is different. The former [latter] is enhanced [quenched] in the region $0.8 \alt x \alt 0.9$ [$0.7 \alt x \alt 0.85$] due to the difference of the contribution from axial vector form factor. Because of these differences charge symmetry breaking in parton distributions will be enhanced in nuclei.
Saito Katsuhiko
Steffens F. M.
Tsushima Kazuo
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