The Unintegrated Gluon Density in the Photon and Heavy Quark Production

TL;DR

This paper investigates the unintegrated gluon density in the photon using the CCFM evolution equation, implementing it in a Monte Carlo generator to predict heavy quark production cross sections in photon-photon collisions, with comparisons to experimental data.

Contribution

First application of the full CCFM evolution to determine the unintegrated gluon density in the photon, integrated into a Monte Carlo generator for cross section predictions.

Findings

Good agreement with LEP data for heavy quark production

Predictions for TESLA energies provided

Demonstrates the importance of unintegrated gluon densities in photon interactions

Abstract

The production cross section of heavy quarks in real and virtual photon-photon collisions has been studied. The unintegrated gluon density in the photon was obtained using the full CCFM evolution equation for the first time. The gluon density was implemented in the Monte Carlo generator CASCADE, and cross sections for heavy quark production in $e^+e^-$ collisions were calculated and compared to LEP data. Also, predictions for heavy quark cross sections in $e^+e^-$ and $\gamma\gamma$ collisions at TESLA energies are given.