Medium modification type phenomena observed in high-multiplicity p+p collisions at LHC energies

TL;DR

This paper investigates medium modification phenomena in high-multiplicity proton-proton collisions at LHC energies, exploring whether effects similar to those in heavy-ion collisions can be observed in elementary systems using PYTHIA8 simulations.

Contribution

It introduces a method to predict and explain medium modification effects in elementary collisions, employing PYTHIA8 with collective-like effects to replicate heavy-ion phenomena.

Findings

Qualitative agreement with heavy-ion collision behavior

Initial state effects enhance low-momentum regions

Final state effects suppress high-momentum regions

Abstract

Nuclear modification factor predicts whether a medium is formed in a collision system or not. One may verify, if scaling of momentum (transverse) distribution from heavy-ion systems with incoherent superposition of number of binary collision, is making up the magnitude of elementary like systems. It was observed in a wide range of experimental data that in lower momentum (transverse) region, initial state effects (viz. cold-nuclear matter effect or radial flow) enhances it. While in higher momentum (transverse) region, final state effects (viz. jet quenching or re-scattering effects) suppresses it. In this article we made an attempt to predict and explain if this heavy-ion like effect can be seen in elementary collisions at favorable experimental conditions. We have employed PYTHIA8 model in this regard, and used effects which give collective-like behaviour within the model constraint. Results from this model qualitatively explains the behaviour observed in heavy-ion systems.