Scaling in $γ^* p$ total cross sections and the generalized vector dominance/color dipole picture

Details Scaling in $γ^* p$ total cross sections and the generalized vector dominance/color dipole picture Scaling in $γ^* p$ total cross sections and the generalized vector dominance/color dipole picture

2001-06-17

arxiv.org/abs/hep-ph/0106188v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, Latex using psfig, 3 figures. Presented at DIS 2001, Bologna, Italy, Apil 27 to May 1, 2001

Scientific paper

The scaling in $\sigma_{\gamma^*p}$ cross sections (for $Q^2/W^2 << 1$) in terms of the scaling variable $\eta = (Q^2 + m^2_0)/\Lambda^2 (W^2)$ is interpreted in the generalized vector dominance/color-dipole picture (GVD/CDP). The quantity $\Lambda^2 (W^2)$ is identified as the average gluon transverse momentum absorbed by the $q \bar q$ state, $<\vec l^{~2}> = (1/6) \Lambda^2 (W^2)$. At any $Q^2$, for $W^2 \to \infty$,the cross sections for virtual and real photons became universal, $\sigma_{\gamma^*p}(W^2,Q^2)/\sigma_{\gamma p}(W^2) \to 1$.

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