New observables for multiple-parton interactions measurements using Z + jets process at the LHC

TL;DR

This paper introduces new observables using Z + jets events at the LHC to improve measurements of multiple-parton interactions, enhancing sensitivity and enabling better constraints on MPI models.

Contribution

It proposes novel observables and a specific phase-space region that increase sensitivity to MPI in Z + jets events at 13 TeV.

Findings

Enhanced sensitivity to MPI with the new observables

Potential for more precise MPI parameter constraints

Validated approach using simulated events at 13 TeV

Abstract

Multiple-parton interactions play a vital role in hadron-hadron collisions. This paper presents a study of the multiple-parton interactions with simulated Z + jets events in proton-proton collisions at a centre-of-mass energy of 13 TeV. The events are simulated with POWHEG followed by hadronization and parton-showering using PYTHIA 8. The events with dimuon invariant mass in the range of 60--120 GeV are selected for the analysis. The charged particle jets, having minimum transverse momentum of 5 GeV and absolute pseudo-rapidity less than 2, are used to construct the observables for measurements of the multiple-parton interactions. The proposed observables and phase-space region presented in this paper found to have enhanced sensitivity to multiple-parton interactions. The increased sensitivity to MPI will be lead to precise constraints on the parameters of the MPI models.