Nonlinear equation for coherent gluon emission
  Motivated by the regime of QCD explored nowadays at LHC, where both the total energy of collision and momenta transfers are high, we investigate evolution equations of high energy factorization. In order to study such effects like parton saturation in final states one is inevitably led to investigate how to combine physics of the BK and CCFM evolution equations. In this paper we obtain a new exclusive form of the BK equation which suggests a possible form of the nonlinear extension of the CCFM equation. 
Krzysztof Kutak, Krzysztof Golec-Biernat, Stanislaw Jadach, Maciej   Skrzypek
hep-ph nucl-th