Speaker
Antoni Szczurek
(Institute of Nuclear Physics)
Description
We review double parton scattering (DPS) effects in three selected reactions:
production of $c \bar c \bar c$, production of jets with large rapidity distance
and $W^+ W^-$ production.
We present QCD leading-order predictions for
energy dependence of $c \bar c \bar c$ production.
The DPS cross section for $c \bar c c \bar c$ grows faster
than that for $c \bar c$ production.
This is generalized to include higher-order corrections
within $k_t$-factorization approach with unintegrated
gluon distributions. Hadronization of $c$-quarks to $D$-mesons
is taken into account in the fragmentation function formalism.
Several differential distributions for two $D$ mesons,
both containing $c$ quark or both containing $\bar c$ antiquark,
are presented and compared to the LHCb collaboration data.
The results of double-parton scattering are compared
with those of single-parton scattering.
We discuss also mutiple $c \bar c$ production in the impact
parameter space.
We discuss contribution of double-parton scattering to
production of jets with large rapidity distance.
We compare contribution of DPS with those from the BFKL
Mueller-Navelet jests and with results of the $k_t$-factorization.
We discuss how the DPS effect could be verified when
studing four-jet sample.
Finally we discuss DPS production of two vector gauge bosons.
We show results and discuss how the DPS contribution could be identified
when looking at leptons from the decay of the gauge bosons.
Author
Antoni Szczurek
(Institute of Nuclear Physics)
