Small collision systems at LHC energies exhibit characteristic features of quark-gluon plasma (QGP) formation, particularly in high-multiplicity events. However, the origin of these phenomena is not yet fully understood. It is therefore crucial to delve deeper into the underlying dynamics of particle production in small collision systems. Particle production in these systems is governed by an interplay of both perturbative and non-perturbative quantum chromodynamics (QCD) processes. Our aim is to investigate their interplay and how they evolve with multiplicity. To achieve this, we use the technique of jet-hadron correlations to calculate the yield associated with jets (hard scatterings) and underlying events (UE), employing the QCD-inspired PYTHIA 8 model. A suppression is observed in the near-side associated jet yield at high-p \(_{T}\) , especially in high-multiplicity (HM) events. This suppression may arise from the nature of HM event selection, which biases the jet sample toward softer jets, but higher multiplicity.

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A Study on Soft and Hard Particle Production Mechanisms in pp Collision Using Jet-Hadron Correlation in PYTHIA8

  • Sanchari Thakur,
  • Subikash Choudhury,
  • Sidharth Kumar Prasad

摘要

Small collision systems at LHC energies exhibit characteristic features of quark-gluon plasma (QGP) formation, particularly in high-multiplicity events. However, the origin of these phenomena is not yet fully understood. It is therefore crucial to delve deeper into the underlying dynamics of particle production in small collision systems. Particle production in these systems is governed by an interplay of both perturbative and non-perturbative quantum chromodynamics (QCD) processes. Our aim is to investigate their interplay and how they evolve with multiplicity. To achieve this, we use the technique of jet-hadron correlations to calculate the yield associated with jets (hard scatterings) and underlying events (UE), employing the QCD-inspired PYTHIA 8 model. A suppression is observed in the near-side associated jet yield at high-p \(_{T}\) , especially in high-multiplicity (HM) events. This suppression may arise from the nature of HM event selection, which biases the jet sample toward softer jets, but higher multiplicity.