The Development of MPI Modelling in PYTHIA

Abstract

Many of the basic ideas in multiparton interaction (MPI) phenomenology were first developed in the context of the PYTHIA event generator, and MPIs have been central in its modelling of both minimum-bias and underlying-event physics in one unified framework. This chapter traces the evolution towards an increasingly sophisticated description of MPIs in PYTHIA, including topics such as the ordering of MPIs, the regularization of the divergent QCD cross section, the impact-parameter picture, colour reconnection, multiparton PDFs and beam remnants, interleaved and intertwined evolution, and diffraction.

arXiv commentTo be published in "Multiple Parton Interactions at the LHC", P. Bartalini and J. R. Gaunt, eds., World Scientific; 42 pages, 5 figures

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• The Space-Time Structure of Hadronization in the Lund Model
• Study of the hard double-parton scattering contribution to inclusive four-lepton production in $pp$ collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
• Introduction to QCD
• Models of Total, Elastic and Diffractive Cross Sections
• Prospects for quarkonium studies at the high-luminosity LHC
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• Extraction of multiple parton interactions and color reconnection from forward-backward multiplicity correlations
• Four-jet double parton scattering production in proton-nucleus collisions within the PYTHIA8 framework
• PYTHIA and the preoccupied proton