Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-02-03
Phys.Rev. D71 (2005) 074001
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, 2 figures, revised final version to appear in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.71.074001
The theoretical predictions are given for the forward limit of the unpolarized spin-flip isovector generalized parton distribution function $(E^u - E^d)(x, \xi, t)$ within the framework of the chiral quark soliton model, with full inclusion of the polarization of Dirac sea quarks. We observe that $[(H^u - H^d) + (E^u - E^d)](x,0,0)$ has a sharp peak around $x=0$, which we interpret as a signal of the importance of the pionic $q \bar{q}$ excitation with large spatial extension in the transverse direction. Another interesting indication given by the predicted distribution in combination with Ji's angular momentum sum rule is that the $\bar{d}$-quark carries more angular momentum than the $\bar{u}$-quark in the proton, which may have some relation with the physics of the violation of the Gottfried sum rule.
Tsujimoto H.
Wakamatsu Masashi
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