Resummation effects in the Higgs boson transverse momentum distribution within the framework of unintegrated parton distributions

The cross sections describing the transverse momentum distributions of Higgs bosons are discussed within the framework of unintegrated parton distributions obtained from the Catani-Ciafaloni-Fiorani-Marchesini (CCFM) equations in the single-loop approximation. It is shown how the approximate treatment of the CCFM equations generates the standard expressions describing the soft gluon resummation effects in the corresponding cross sections. Possible differences between exact and approximate solutions of the CCFM equations are discussed on the example of the gg-->H fusion mechanism, which gives the dominant contribution to Higgs boson production.