The specific charged hadron multiplicity in ep and eD semi-inclusive deep-inelastic scattering in the PYTHIA and PACIAE models

TL;DR

This study compares the performance of PYTHIA and PACIAE models in predicting charged hadron multiplicities in semi-inclusive deep-inelastic scattering at 27.6 GeV, highlighting their respective accuracies against experimental data.

Contribution

It introduces a comparative analysis of PYTHIA 6.4 and PACIAE 2.2 models for DIS hadron multiplicities, emphasizing model differences and data agreement.

Findings

PACIAE reproduces HERMES data more accurately than PYTHIA.

Default PYTHIA parameters poorly fit the data, while PACIAE fits fairly well.

Differences between models impact the multiplicity predictions.

Abstract

We employed the PYTHIA 6.4 model and the extended parton and hadron cascade model PACIAE 2.2 to comparatively investigate the DIS normalized specific charged hadron multiplicity in the 27.6 GeV electron semi-inclusive deep-inelastic scattering off proton and deuteron. The PYTHIA and PACIAE results calculated with default model parameters not well and fairly well reproduce the corresponding HERMES data, respectively. In addition, we have discussed the effects of the differences between the PYTHIA and PACIAE models.