Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-06-26
Phys.Lett.B640:188-195,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 4 eps figures
Scientific paper
10.1016/j.physletb.2006.07.068
We investigate the transition of the polarized photon structure function $g_1^\gamma(x,Q^2,P^2)$ when the target photon shifts from on-shell ($P^2=0$) to far off-shell ($P^2\gg \Lambda^2$) region. The analysis is performed to the next-to-leading order in QCD. The first moment of $g_1^\gamma$ which vanishes for the real photon, turns to be a negative value when target photon becomes off-shell. The explicit $P^2$-dependence of the first moment sum rule as well as of the structure function $g_1^\gamma(x,Q^2,P^2)$ as a function of $x$ is studied in the framework of the vector meson dominance model.
Sasaki Kaori
Ueda Takahiro
Uematsu Tsuneo
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