Resolved photon and multi-component model for ${\gamma }^{\ast }$p and ${\gamma }^{\ast }{\gamma }^{\ast }$ scattering at high energies

Abstract

We generalize our previous model for ${\gamma }^{\ast }p$ scattering to $\gamma \gamma$ scattering. In the latter case the number of components naturally grows. When using the model parameters from our previous ${\gamma }^{\ast }p$ analysis the model cross section for $\gamma \gamma$ scattering is larger than the corresponding LEP2 experimental data by more than a factor of two. However, performing a new simultaneous fit to ${\gamma }^{\ast }p$ and $\gamma \gamma$ total cross section we can find an optimal set of parameters to describe both processes. We propose new measures of factorization breaking for ${\gamma }^{\ast }{\gamma }^{\ast }$ collisions and present results for our new model.

23 pages, 10 figures

References in corpus (5)

• TESLA Technical Design Report, Part VI, Chapter 1: The Photon Collider at TESLA
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• From soft to hard regime in elastic pion-pion scattering above resonances
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• A two-component model for ${\gamma }^{\ast }$-p scattering at small Bjorken x