Heavy quark production at the Fermilab Tevatron and DESY ep collider HERA using k_t factorization with the CCFM evolution approach

The application of k_t factorization supplemented with the Ciafaloni-Catani-Fiorani-Marchesini (CCFM) small-x evolution equation to heavy quark production at the Fermilab Tevatron and at DESY HERA is discussed. The bb̅ production cross sections at the Tevatron can be consistently described using the k_t-factorization formalism together with the unintegrated gluon density obtained within the CCFM evolution approach from a fit to HERA F₂ data. Special attention is drawn to the comparison with measured visible cross sections, which are compared to the hadron level Monte Carlo generator CASCADE.