CCFM Evolution with Unitarity Corrections

Abstract

We considerably extend our previous analysis of the implementation of an absorptive boundary condition, which mimics saturation effects, on the linear CCFM evolution. We present detailed results for the evolution of the unintegrated gluon density in the presence of saturation and extract the energy dependence of the emerging saturation momentum. We show that CCFM and BFKL evolution lead to almost identical predictions after including the effects of gluon saturation and of the running of the coupling. We moreover elucidate several important and subtle aspects of the CCFM formalism, such as its relation to BFKL, the structure of the angular ordered cascade, and the derivation of more inclusive versions of CCFM. We also propose non--leading modifications of the standard CCFM evolution which may play an important role for phenomenological studies.

50 pages, v2 minor corrections, published in NPA

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Cited by in corpus (15)

• Transverse momentum dependent gluon density from DIS precision data
• Next-to-leading and resummed BFKL evolution with saturation boundary
• Energy dependence of the saturation scale and the charged multiplicity in pp and AA collisions
• A comparative study of small x Monte Carlos with and without QCD coherence effects
• Collinearly improved JIMWLK evolution in Langevin form
• Nonlinear equation for coherent gluon emission
• Jets in the forward region at the LHC
• Non-linear evolution in CCFM: The interplay between coherence and saturation
• Gluon saturation scale from the KGBJS equation
• Examination of $k_t$-factorization in a Yukawa theory
• Estimation of saturation and coherence effects in the KGBJS equation - a non-linear CCFM equation
• A new Monte Carlo study of evolution equation with coherence
• Structure Functions and Low-x -- Working Group Summary
• Some aspects of final states and QCD evolution equations
• Multiparticle Dynamics in the LHC Era