Jet fragmentation as a tool to explore double parton scattering using Z-boson + jets processes at the LHC
arXiv:1905.00184 · doi:10.1103/PhysRevD.99.094025
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.
arXiv comment14 pages, 4 figures
References in corpus (27)
- The anti-k_t jet clustering algorithm
- A Brief Introduction to PYTHIA 8.1
- FastJet user manual
- Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
- MadGraph 5 : Going Beyond
- Herwig++ Physics and Manual
- MadEvent: Automatic Event Generation with MadGraph
- Event generator tunes obtained from underlying event and multiparton scattering measurements
- Performance of -Jet Identification in the ATLAS Experiment
- MINLO: Multi-scale improved NLO
- Quark and Gluon Tagging at the LHC
- Measurement of hard double-parton interactions in W->lv+ 2 jet events at sqrt(s)=7 TeV with the ATLAS detector
- Elements of a theory for multiparton interactions in QCD
- Double parton interactions in photon+3 jet events in ppbar collisions sqrt{s}=1.96 TeV
- Study of double parton scattering using W + 2-jet events in proton-proton collisions at sqrt(s) = 7 TeV
- Light-quark and gluon jet discrimination in pp collisions at = 7 TeV with the ATLAS detector
- Search for new physics with same-sign isolated dilepton events with jets and missing transverse energy at the LHC
- Study of hard double-parton scattering in four-jet events in collisions at TeV with the ATLAS experiment
- A Double Parton Scattering Background to Associate and Production at the LHC
- Constraints on the double-parton scattering cross section from same-sign W boson pair production in proton-proton collisions at 8 TeV
- W and Z bosons in association with two jets using the POWHEG method
- Measurements of differential production cross sections for a Z boson in association with jets in pp collisions at sqrt(s) = 8 TeV
- Possible indication to the QCD evolution of double parton distributions?
- Dynamical approach to MPI in W+dijet and Z+dijet production within the PYTHIA event generator
- Multiple Parton Interactions in Z+jets production at the LHC. A comparison of factorized and non--factorized double parton distribution functions
- New observables for multiple-parton interactions measurements using Z + jets process at the LHC
- Double Parton Scattering of Weak Gauge Boson Productions at the 13 TeV and 100 TeV Proton-Proton Colliders