# Anomalous features of particle production in high-multiplicity events of pp collisions at the LHC energies

## TL;DR

This paper investigates unusual features of particle production in high-multiplicity proton-proton collisions at LHC energies, highlighting discrepancies between experimental data and hydrodynamic model predictions.

## Contribution

It provides a detailed comparison of experimental data with the hydrodynamic EPOS3 model, revealing significant quantitative mismatches in high-multiplicity pp events.

## Key findings

- Model fails to accurately reproduce certain features of high-multiplicity events.
- Significant discrepancies observed between data and hydrodynamic simulations.
- Highlights need for improved models of particle production in pp collisions.

## Abstract

Prevalent models of multi-particle production in relativistic pp collisions at pre-LHC energies, fail to provide convincing explanations to certain significant features of the final-state charged particles in high-multiplicity pp events at the LHC. This article presents a study, contrasting those features, usually interpreted as collective behaviour of particle production in relativistic heavy-ion collisions, in the framework of hydrodynamic EPOS3 model, emphasizing quantitative comparison between the data and the model-based simulation in the same kinematic ranges, for better cognizance of the data. The work reveals quantitative mismatch between the data and the model.