Comparison of Deep Inelastic Electron-Photon Scattering Data with the Herwig and Phojet Monte Carlo Models

TL;DR

This study compares deep inelastic electron-photon scattering data from LEP1 with HERWIG and PHOJET models, revealing discrepancies that highlight the need for model improvements.

Contribution

It provides a comprehensive comparison of experimental data with Monte Carlo models, identifying areas where models do not accurately reproduce observed phenomena.

Findings

Significant differences between data and models in various distributions

Data from multiple experiments show consistent results

Highlights the need for refining Monte Carlo models

Abstract

Deep inelastic electron-photon scattering is studied in the Q**2 range from 1.2 to 30 GeV**2 using the LEP1 data taken with the ALEPH, L3 and OPAL detectors at centre-of-mass energies close to the mass of the Z boson. Distributions of the measured hadronic final state are corrected to the hadron level and compared to the predictions of the HERWIG and PHOJET Monte Carlo models. For large regions in most of the distributions studied the results of the different experiments agree with one another. However, significant differences are found between the data and the models. Therefore the combined LEP data serve as an important input to improve on the Monte Carlo models.