Multiple Parton Interactions And Production Of Charged Particles Up To The Intermediate-P(T) Range In High-Multiplicity Pp Events At The Lhc (Vol 95, 014016, 2017)

Satisfactory description of data by hydrodynamics-motivated models, as has been reported recently by experimental collaborations at the LHC, confirm "collectivity" in high-multiplicity proton-proton (pp) collisions. Notwithstanding this, a detailed study of high-multiplicity pp data in other approaches or models is essential for better understanding of the specific phenomenon. In this study, the focus is on a pQCD-inspired multiparton interaction (MPI) model, including a color reconnection (CR) scheme as implemented in the Monte Carlo code, PYTHIA8 tune 4C. The MPI with the color reconnection reproduces the dependence of the mean transverse momentum < p(T)> on the charged particle multiplicity N-ch in pp collisions at the LHC, providing an alternate explanation to the signature of "hydrodynamic collectivity" in pp data. It is, therefore, worth exploring how this model responds to other related features of high-multiplicity pp events. This comparative study with recent experimental results demonstrates the limitations of the model in explaining some of the prominent features of the final-state charged particles up to the intermediate-pT (p(T) < 2.0 GeV= c) range in high-multiplicity pp events.