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.

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

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• Heavy quark and quarkonium production at CERN LEP2: k_T-factorization versus data
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• Exclusive final states in diffractive excitation
• Hadronic Collisions in the Linked Dipole Chain Model
• BFKL and CCFM evolutions with saturation boundary
• Study of the Linked Dipole Chain Model in heavy quark production at the Tevatron
• BFKL dynamics at hadron colliders
• Unintegrated gluon distributions in D* and dijet associated photoproduction at HERA
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