Abstract
The Large Hadron Collider witnesses the highest ever production cross-section of double parton scattering processes. The production of a Z-boson along with two jets from double parton scattering provides a unique opportunity to explore the kinematics of double parton scattering processes and their dependence on the scale of the second interaction. The experimental measurement of this process is largely contaminated by Z + jets production from single parton scattering. In this paper, fragmentation properties of a jet are explored to check their sensitivity towards double parton scattering. The present study is performed using simulated Z + jets events, produced with \textsc{madgraph} and \textsc{powheg} Monte-Carlo event generators, hadronized and parton showered using \textsc{pythia}8. The effect of different hadronization model on the discrimination based on the fragmentation properties of a jet is also investigated by using events simulated with \textsc{herwig}++. It is observed that discrimination based on the fragmentation properties of a jet can significantly suppress the background from single parton scattering, which results into 40--50\% gain in the contribution of double parton scattering.
Highlights
The large collision energy and involved parton densities in a proton-proton collision at Large Hadron Collider (LHC) lead to significant increase in probability of more than one parton-parton scattering in the same pp collision
In Z þ jets events simulated with MADGRAPH + PYTHIA8, two jets are required along with a Z-boson as per the kinematic selection criteria mentioned in Sec
The fraction of double parton scattering (DPS) processes contributing in selected Z þ 2-jets sample is about 0.075 which is consistent with the previous studies [10]
Summary
The large collision energy and involved parton densities in a proton-proton (pp) collision at Large Hadron Collider (LHC) lead to significant increase in probability of more than one parton-parton scattering in the same pp collision. MPI produce particles with relatively small transverse momenta (pT), but there is a possibility of producing particles with large pT or mass, such as jets and/ or vector (W/Z) bosons. The production of such particles from at least two parton-parton scatterings is referred to as double parton scattering (DPS). The study of DPS provides vital information on the parton-parton correlations and parton distributions in a hadron [2].
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