Effect of color reconnection and hadronic re-scattering on underlying events in pp collisions at LHC energies

Abstract

Underlying events dominate most of the hadronic activity in p$-$p collisions and are spanned from perturbative to non-perturbative QCD, having a sensitivity ranging from the multi-scale to very low-x scale physics. A detailed understanding of such events plays a crucial role in the accurate understanding of Standard Model ()SM and Beyond Standard Model physics. The underlying event activities has been studied within the framework of Pythia 8 Monte Carlo model, considering the underlying events observables mean charged particle multiplicity density , $⟨d^{2}N/d\eta d\varphi ⟩$ and mean scalar $p_T$ sum, $⟨d^2\sum p_T/d\eta d\varphi ⟩$ as a function of leading charged particle in towards, away, and transverse region of p$-$p collisions at $\sqrt{s}$ = 2.76, 7 and 13 TeV. The towards, away, and transverse regions have been defined on an azimuthal plane relative to leading particle in p$-$p collisions. The energy dependence of underlying events and their activities in the central and forward region has also been studied. The effect of hadronic re-scattering, color reconnection, and rope hadronization mechanism implemented in Pythia 8 has been studied in details to gain insight into the different processes contributing to underlying events in soft sector.

References in corpus (9)

• An Introduction to PYTHIA 8.2
• Herwig 7.0 / Herwig++ 3.0 Release Note
• Event Generation with Sherpa 2.2
• Event generator tunes obtained from underlying event and multiparton scattering measurements
• Measurement of charged-particle distributions sensitive to the underlying event in $\sqrt{s}=13$ TeV proton-proton collisions with the ATLAS detector at the LHC
• A Framework for Hadronic Rescattering in pp Collisions
• Universality of the underlying event in pp collisions
• Probing color reconnection with underlying event observables at the LHC energies
• Kinematic strangeness production in cluster hadronization