Multiplicity Dependence of the Jet Structures in pp Collisions at LHC Energies

TL;DR

This paper investigates how jet structures in proton-proton collisions at LHC energies depend on event multiplicity, revealing modifications due to multi-parton interactions and flavor-dependent fragmentation effects.

Contribution

It introduces a novel jet size measure that is robust against simulation parameters and explores the impact of multi-parton interactions and heavy-flavor jets on jet structure.

Findings

Jet shape modification observed with multi-parton interactions.

A new multiplicity-independent jet size measure proposed.

Sensitivity of jet structure to heavy-flavor fragmentation demonstrated.

Abstract

We study the event multiplicity dependence of the jet structure in pp collisions. We present evidence for jet shape modification due to multi-parton interactions using PYTHIA and HIJING++ Monte Carlo (MC) event generators as an input to our analysis. We introduce a characteristic jet size measure which is independent of the choice of the simulation parameters, parton distribution functions, jet reconstruction algorithms and even of the presence or absence of multi-parton interactions. We also investigate heavy-flavor jets and show the sensitivity of the multiplicity-differential jet structure to flavor-dependent fragmentation.