SEZIONE PAVIA
We discuss the problem of incorporating recoil effects into the probabilistic QCD evolution scheme based on the picture of colour dipoles as done in recent Monte Carlo programs. Such a scheme correctly describes subleading soft contributions to multiplicity distributions. However we find that a simple receipt for incorporating recoil effects into the dipole multiplication picture based on the ordering of gluon energies conflicts the collinear factorization and does not lead to the correct DGLAP equation.

DATA: 10-03-2010