Dynamical approach to MPI in W+dijet and Z+dijet production within the PYTHIA event generator

TL;DR

This paper introduces a new numerical approach incorporating 1 to 2 mechanisms into the PYTHIA event generator to improve the modeling of double parton scattering in W+dijet and Z+dijet production at the LHC.

Contribution

It presents a novel numerical method for including 1 to 2 mechanisms in DPS modeling within PYTHIA, enhancing agreement with experimental data.

Findings

Improved description of 7 TeV experimental data with the new approach.

Predictions for 14 TeV collisions for DPS and UE observables.

Validation of the method against existing four-jet final state results.

Abstract

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.