Extraction of multiple parton interactions and color reconnection from forward-backward multiplicity correlations

Abstract

Forward-backward multiplicity correlations have been studied in electron-positron, proton-proton and more recently in lead-lead collisions. For the proton-proton case, comparison of experimental results to different models reveals an incomplete understanding of the physical phenomenon associated with these correlations. In this work, we present a study of forward-backward multiplicity correlations in proton-proton collisions using the PYTHIA event generator, at LHC energies. A detailed analysis is presented with and without weak decays, splitting data samples into soft and hard QCD processes, and comparing the computed correlations for short and long range pseudorapidity regions. Each of these regions is analyzed accounting for the effects of color reconnection and independent multiple parton interactions. We show that a combination of these effects is required to explain the latest measurements on proton-proton data. Furthermore, is shown that from measurements of multiplicity correlations is possible to extract the average number of multiple parton interactions in the event producing these correlations, and albeit model depending, to predict the strength of these correlations, not yet measured, for higher energy collisions.

arXiv comment10 pages, 8 figures. It will be published in Eur. Phys. J. C

References in corpus (16)

• An Introduction to PYTHIA 8.2
• Tuning PYTHIA 8.1: the Monash 2013 Tune
• Glasma flux tubes and the near side ridge phenomenon at RHIC
• Color reconnection and flow-like patterns in pp collisions
• Double parton interactions in photon+3 jet events in ppbar collisions sqrt{s}=1.96 TeV
• Effects of color reconnection on $t\bar{t}$ final states at the LHC
• Growth of Long Range Forward-Backward Multiplicity Correlations with Centrality in Au+Au Collisions at $\sqrt{s_{NN}}$ = 200 GeV
• Correlations between multiplicities and average transverse momentum in the percolating colour strings approach
• Mid-rapidity charged hadron transverse spherocity in pp collisions simulated with Pythia
• Forward-Backward Correlations and Event Shapes as probes of Minimum-Bias Event Properties
• Three- and four-jet final states in photoproduction at HERA
• Global properties of proton-proton collisions at $\sqrt{s}$ = 100 TeV
• The Development of MPI Modelling in PYTHIA
• Effects produced by multi-parton interactions and color reconnection in small systems
• Colour Reconnection at Future ${\mathrm{e}}^{+}{\mathrm{e}}^{-}$ Colliders
• Average Event Properties from LHC to FCC-hh

Cited by in corpus (2)

• Forward-backward multiplicity and momentum correlations in $pp$ collisions at LHC energies
• Multiplicity dependence of ${\rm Y}$ production at forward rapidity in pp collisions at $\sqrt{s}$ = 13 TeV