Speaker
Description
We have studied production of open charm mesons in association with one or two jets at the LHC.
The cross sections for $c\bar{c}+\mathrm{jet}$ and $c\bar{c}+\mathrm{2jets}$ final states production
are calculated in the leading-order collinear approximation as well as in the $k_{T}$-factorization
approach, where a part of higher order corrections is effectively included.
Both processes under consideration here give possibilities of detailed testing of pQCD dynamics beyond
standard case of inclusive charm cross section. This opens new ways, e.g. for phenomenological verification
of different models of transverse-momentum-dependent (unintegrated) parton distribution functions in the case
of mulit-particle final states. For the case of $c\bar{c}+\mathrm{jet}$ mechanism, different unintegrated gluon
distribution functions are used in the $k_{T}$-factorization approach. Several predictions for the LHC are presented,
including various correlation observables. Integrated cross sections for $D^{0}+\mathrm{jet}$ production for ATLAS
detector acceptance and for different cuts on jet transverse momenta are also presented [1].
Associated production of charm with two jets is also very interesting from the point of view of searching for
multiple-parton interaction effects. We have carefully examined production of $D^{0}+\mathrm{2jets}$ and
$D^{0}\bar{D^{0}}+\mathrm{2jets}$ in both single-parton scatttering (SPS) and double-parton scattering (DPS) mechanisms.
For both final states we indicate regions of phase-space where the DPS contributions clearly dominate over the standard
SPS components. Several correlation distributions useful for measuremt of the DPS effects for the LHCb experiment are proposed [2].
[1] R. Maciula, and A. Szczurek, "Charm quark and meson production in association with single-jet at the LHC", Phys. Rev. D94, 114037 (2016).
[2] R. Maciula, and A. Szczurek, a paper in preparation.
