DIFFERENCES BETWEEN MONTE-CARLO MODELS FOR DIS AT SMALL-X AND THE RELATION TO BFKL DYNAMICS

The differences between two standard Monte Carlo models, LEPTO and ARI ADNE, for deep inelastic scattering at small-x is analysed in detail. It is shown that the difference arises from a 'unorthodox' suppression factor used in ARIADNE which replaces the normal ratio of parton dens ities. This gives rise to a factor that qualitatively is similar to wh at one would expect from BFKL dynamics for some observables like the e nergy flow and forward jets but not for the 2+1 jet cross-section. It is also discussed how one could use the 2+1 jet cross-section as a pro be for BFKL dynamics.