Charm quark and meson production in association with single-jet at the LHC

We discuss charm quark/antiquark and charmed meson production in association with one extra jet (gluon, quark, antiquark) at the LHC. The calculations are performed both in collinear and k(T)-factorization approaches. Different unintegrated gluon distribution functions are used in the k(T)-factorization approach. Several predictions for the LHC are presented. We show distributions in rapidity and transverse momenta of c/(c) over bar (or charmed mesons) and the associated jet as well as some two-dimensional observables. Interesting correlation effects are predicted, e.g., in azimuthal angles phi(c (c) over bar) and phi(c-jct). We have also discussed a relation of the 2 -> 2 and 2 -> 3 partonic calculations in the region of large transverse momenta of charm quarks/antiquarks as well as the similarity of the next-to-leading order collinear approach and the kT-factorization approach with the Kimber-Martin-Ryskin unintegrated parton distribution functions. Integrated cross sections for D-0 + jet production for ATLAS detector acceptance and for different cuts on jet transverse momenta are also presented.