Measurement of the near-threshold $e^+e^- \to D^{(*)\pm}{D}{}^{*\mp}$ cross section using initial-state radiation

TL;DR

This paper measures the cross section of specific charm meson pair production near threshold energies using initial-state radiation, employing a partial reconstruction method to enhance efficiency and reduce background.

Contribution

It provides the first detailed measurement of the $e^+e^- o D^{(*) ext{±}} D^{* ext{∓}}$ cross section near threshold with initial-state radiation, utilizing a large data sample and a novel partial reconstruction technique.

Findings

Cross section measurements as a function of energy near threshold

Observation of threshold behavior and possible resonant structures

Enhanced measurement precision through partial reconstruction

Abstract

We report a measurement of the exclusive $e^+e^- \to D^{(*)\pm}{D}{}^{*\mp}$ cross section as a function of center-of-mass energy near the $D^{(*)^{\pm}}{D}{}^{*\mp}$ threshold with initial state radiation. A partial reconstruction technique is used to increase the efficiency and to suppress background. The analysis is based on a data sample collected with the Belle detector at the $\Upsilon(4S)$ resonance and nearby continuum with an integrated luminosity of 547.8 $\mathrm{fb}^{-1}$ at the KEKB asymmetric-energy $e^+ e^-$ collider.