Parametrization of $F_2^\gamma$ at low $Q^2$ and of $\sigma_{\gamma \gamma}$ and $\sigma_{\gamma^* \gamma}$ at high-energies

Badelek, Barbara Maria; Krawczyk, M.; Kwiecinski, J.; Stasto, A. M.

Report

PUBDB-2023-04151

Parametrization of $F_2^\gamma$ at low $Q^2$ and of $\sigma_{\gamma \gamma}$ and $\sigma_{\gamma^* \gamma}$ at high-energies

Badelek, B. M. ; Krawczyk, M. ; Kwiecinski, J. ; Stasto, A. M.

2000

8 pp. (2000) [10.3204/PUBDB-2023-04151]

This record in other databases:

Please use a persistent id in citations: doi:10.3204/PUBDB-2023-04151

Report No.: LC-TH-2000-048

Abstract: A parametrization of the real photon structure function $F_2^\gamma$ in the low $Q^2$, low $x$ region is formulated. It includes both the vector meson dominance (VMD) and the QCD components, the latter suitably extrapolated to the low $Q^2$ region and based on arbitrary parton distributions in the photon. The parametrization used together with the Gluck, Reya, and Vogt (GRV) and Gluck, Reya, and Schienbein (GRS) parton densities describes reasonably well the existing high energy data on $F_2^\gamma$, $\sigma_{\gamma\gamma}$, and the low $Q^2$ data on $\sigma_{\gamma^* \gamma}$. Predictions for $\sigma_{\gamma\gamma}$ and for $\sigma_{\gamma^*\gamma}$ for energies which may become accessible in future linear colliders are also given.

Keyword(s): electron positron: inelastic scattering ; exchange: two-photon ; photon electron: interaction ; photon photon: interaction ; photon: on-shell ; photon: off-shell ; photon: structure function ; parametrization ; total cross section: energy dependence ; vector dominance ; dispersion relation ; quantum chromodynamics ; model: parton ; numerical calculations: interpretation of experiments