We discuss diffractive production of open charm and bottom mesons and dijet at the LHC. The differential cross sections for single- and central-diffractive mechanisms for $c \bar c $and $b \bar b$ pair production and dijets are calculated in the framework of the Ingelman-Schlein model corrected for absorption effects. In this approach one assumes that the pomeron has a well defined partonic structure, and that the hard process takes place in a pomeron-proton or proton-pomeron (single diffraction) or pomeron-pomeron (central diffraction) processes. For $c \bar c$ production, leading-order gluon-gluon fusion and quark-antiquark anihilation partonic subprocesses are taken into consideration. For jets all leading order processes are included. Both pomeron flux factors as well as parton distributions in the pomeron are taken from the H1 Collaboration analysis of diffractive structure function and diffractive dijets at HERA. The extra corrections from subleading reggeon exchanges are explicitly calculated and are also taken into consideration. Predictions for single- and central-diffractive production in the ̄ correlations will be presented, including case of inclusive D and B mesons, as well as $D \bar D$ detector acceptance of the ATLAS, CMS and LHCb Collaborations. The experimental aspects of possible standard and dedicated measurements are carefully discussed. For the first time, the differential cross sections for the diffractive $c \bar c$ pair and dijets production are calculated in the framework of the $k_t$ -factorization approach, i.e. effectively including higher-order corrections. The unintegrated (transverse momentum dependent) diffractive parton distributions in proton are calculated with the help of the Kimber-Martin- Ryskin prescription where collinear diffractive PDFs are used as input. The latter are obtained by means of the Ingelman-Schlein model. Several quark-level differential cross sections are shown, including one-dimensional distribution and two-dimensional correlation distributions (e.g. $\phi_{c \bar c}$ - azimuthal angle correlations or pair transverse momentum $p_t$ distributions. The hadronization of charm quarks is taken into account by means of fragmentation function technique. Predictions for single-diffractive production of $D^0$ meson including detector acceptance of the ATLAS experiment are presented. Crucial aspects of possible standard and dedicated measurements within the ATLAS detector are also discussed. Some distributions for dijets are compared with experimental data from the CDF collaboration.

1. M. Luszczak, R. Maciula and A. Szczurek, Single- and central-diffractive production of open charm and bottom mesons at the LHC: theoretical predictions and experimental capabilities, Phys. Rev. D 91 (2015), 054024.

2. M. Luszczak, R. Maciula, A. Szczurek and M. Trzebinski, Diffractive charm production at the LHC within $k_t$ -factorization approach, arXiv:1606.06528 [hep-ph].

3. M. Luszczak, R. Maciula, A. Szczurek and I. Babiarz, Diffractive production of dijets within $k_t$ -factorization approach, a paper in preparation.