# Study of a background reconstruction method for the measurement of D-meson azimuthal angular correlations

## TL;DR

This paper evaluates background reconstruction techniques for D-meson azimuthal correlation measurements using PYTHIA simulations, finding the side-band method more effective than the like-sign method in accurately modeling correlated backgrounds.

## Contribution

The study compares and assesses the effectiveness of like-sign and side-band background methods for D-meson correlation analysis in simulated data.

## Key findings

- Like-sign method fails to reproduce correlated background in D0-D0bar correlations.
- Side-band method accurately describes both single D0 yields and correlated backgrounds.
- Side-band method is recommended for background estimation in D-meson correlation studies.

## Abstract

We study experimental background reconstruction methods for the measurement of $D-\overline{D}$ correlation using a PYTHIA simulation. Like-sign and side-band background methods that are widely used in the experimental measurements of single $D$-meson production yields were deployed for the correlation background study. It is found that the like-sign method which well describes the combinatorial background of single $D^{0}$ meson yields fails to reproduce the correlated background in the $D^{0}-\overline{D^{0}}$ correlation measurement, while the side-band background method yields a good description of the background for both the single $D^0$ yields and of the correlated background of the $D^{0}-\overline{D^{0}}$ correlation measurement.