Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-06-07
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, LaTeX, 4 eps figures, npb.sty file included, Talk given at Loops and Legs 2004, Zinnowitz, Germany, April 25-30, 2004
Scientific paper
10.1016/j.nuclphysbps.2004.09.04
We discuss target mass effects in the polarized virtual photon structure functions $g_1^\gamma (x,Q^2,P^2)$, $g_2^\gamma (x,Q^2,P^2)$ for the kinematic region $\Lambda^2\ll P^2 \ll Q^2$, where $-Q^2 (-P^2)$ is the mass squared of the probe (target) photon. We obtain the expressions for the structure functions in closed form by inverting the Nachtmann moments for the twist-2 and twist-3 operators. Numerical analysis shows that target mass effects appear at large $x$ and become sizable near the maximal value of $x$, as the ratio $P^2/Q^2$ increases. Target mass effects for the QCD sum rules of $g_1^\gamma$ and $g_2^\gamma$ are also investigated.
Sasaki Ken
Uematsu Tsuneo
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