  The new numerical approach that includes 1 to 2 mechanism is applied to
double parton scattering (DPS) in W+dijet and Z+dijet final state production in
proton-proton collisions at LHC. By using the underlying event (UE) simulation
from a pythia 8 tune extracted in hadronic events, we show that, like in the
case of a four-jet final state, the inclusion of 1 to 2 mechanism improves the
description of experimental data measured at 7 TeV. In addition, predictions
for proton-proton collisions at a center-of-mass energy of 14 TeV are shown for
DPS- and UE-sensitive observables.
