# Subthreshold poles in electron-positron annihilation. DD final states

**Authors:** Peter Lichard  
**arXiv:** [2505.18540](https://arxiv.org/abs/2505.18540)  
**Date:** 2025-05-24  
**Summary page:** https://www.summarizepaper.com/fr/paper/2505.18540v1/

## Abstract

We show that the ${\psi(2\mathrm S)}$ subthreshold pole influences the cross section of the electron-positron annihilation into the ${\mathrm D\bar\mathrm D}$ final states. We make the fits to the BESIII data \cite{besiii2024} on ${\mathrm D^0\bar\mathrm D^0}$ and ${\mathrm D^+\mathrm D^-}$ final states, and also two common fits to both processes. The statistical significance of the subthreshold pole is greater than 4$\sigma$ in all cases.