Abstract
In this paper γ*-γ* scattering with large, but more or less equal virtualities of two photons is discussed using BFKL dynamics, emphasizing the large impact parameter behavior (bt) of the dipole-dipole amplitude. It is shown that the non-perturbative contribution is essential to fulfill the unitarity constraints in the region of bt < 1/2mπ, where mπ is pion mass. The saturation and the unitarization of the dipole-dipole amplitude is considered in the framework of the Glauber-Mueller approach. The main result is that we can satisfy the unitarity constraints introducing the non-perturbative corrections only in initial conditions (Born amplitude).
Original language | English |
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Pages (from-to) | 3081-3102 |
Number of pages | 22 |
Journal | Acta Physica Polonica B |
Volume | 34 |
Issue number | 6 |
State | Published - Jun 2003 |