A Simple Model for the Bfkl-dglap Transition

When k⊥ is large and 1/x is limited we are in the DGLAP regime, and when 1/x is large and k⊥ is limited we are in the BFKL regime. An essential question is then: What is large? Where is the boundary between the regimes, and what is the behaviour in the transition region? We will here present a simple interpolating model, which can illuminate these questions. The model is relevant for small x, and has a smooth transition between large k⊥, where ordered chains dominate, and small k⊥, where non-ordered chains are most important. We will first discuss the case of a fixed coupling, and after that the case with a running coupling. The results are obtained in collaboration with Gabriela Miu, and a more extensive presentation is given in ref. 1.