Measurement of the near-threshold $e^+e^- \to D \bar D$ cross section using initial-state radiation

TL;DR

This paper measures the cross section of the process $e^+e^- o D ar D$ near threshold energies using initial-state radiation, providing detailed data across a broad energy range.

Contribution

It presents the first precise measurement of the $e^+e^- o D ar D$ cross section near threshold using initial-state radiation at Belle.

Findings

Cross section data from threshold to 5 GeV/c^2

Enhanced understanding of charm meson production

Data useful for theoretical models and future experiments

Abstract

We report measurements of the exclusive cross section for $e^+e^- \to D \bar D $, where $D=D^0$ or $D^+$, in the center-of-mass energy range from the $D \bar D $ threshold to $5\mathrm{GeV}/c^2$ with initial-state radiation. The analysis is based on a data sample collected with the Belle detector with an integrated luminosity of 673 $\mathrm{fb}^{-1}$.