Soft emissions and the equivalence of BFKL and CCFM final states

Abstract

This article demonstrates that the BFKL and CCFM equations, despite their different physical content, lead to equivalent results for any final-state observable at leading single-logarithmic order. A novel and fundamental element is the treatment also of the soft (z->1 divergent) part of the splitting function in the CCFM equation.

Comments: 18 pages, 7 figures. Version 2 contains a few extra sentences to emphasise that the equivalence applies to the predictions from the equations