Studies of correlations between D and ${\bar D}$ mesons in high energy photoproduction

TL;DR

This paper investigates the correlations between D and anti-D mesons in high-energy photoproduction to understand heavy quark production dynamics, using experimental data and comparisons with simulation models.

Contribution

It provides new experimental measurements of D and anti-D meson correlations in photoproduction and compares these results with theoretical predictions from Pythia.

Findings

Observed D-anti-D correlation patterns consistent with heavy quark production models

Identified contributions from $ ext{psi}(3770)$ production in the data

Compared experimental results with Pythia simulations to evaluate model accuracy

Abstract

Studies of $D{\bar D}$ correlations for a large sample of events containing fully and partially reconstructed pairs of charmed $D$ mesons recorded by the Fermilab photoproduction experiment FOCUS (FNAL-E831) are presented. Correlations between $D$ and ${\bar D}$ mesons are used to study heavy quark production dynamics. We present results for fully and partially reconstructed charm pairs and comparisons to a recent version of \textsc{Pythia} with default parameter settings. We also comment on the production of $\psi(3770)$ in our data.