Double-parton scattering effects in double charm production within gluon fragmentation scenario

We discuss charm $D^0{D}^0$ meson-meson pair production in the forward rapidity region related to the LHCb experimental studies at $\sqrt{s}$ = 7 TeV. We consider double-parton scattering mechanisms of double $c\bar{c}$ production and subsequent standard $cc\to D^0{D}^0$ scale-independent hadronization as well as new double $g$ and mixed $gc\bar{c}$ production mechanisms with $gg \to D^{0}D^{0}$and$gc \to D^{0}D^{0}$ scale-dependent hadronization. The new scenario with gluon fragmentation components results also in a new single-parton scattering mechanism of $gg$ production which is also taken here into account. Results of the numerical calculations are compared with the LHCb data for several correlation observables. The new mechanisms lead to a larger cross sections and to slightly different shapes of the calculated correlation observables.