Small-x one-particle-inclusive quantities in the CCFM approach

This article presents the results of a quantitative study of the small-x da ta at HERA, using the CCFM equation. The first step consists of choosing th e version of the CCFM equation to be used, corresponding to selecting a par ticular subset of next-to-leading-logarithmic corrections - the choice is c onstrained by requiring a phenomenologically reasonable small-x growth. For the time being, the parts of the splitting functions that are finite at z = 0 have been left out. We then examine results for F-2(c), R, the transver se energy ow, the charged-particle transverse-momentum spectrum and the for ward-jet cross section and compare to data. While some of the data is repro duced better than with DGLAP-based calculations, the agreement is not entir ely satisfactory, suggesting that the approach developed here is not yet su itable for detailed phenomenology. We discuss why, and suggest directions f or future work.