A subthreshold pole in electron-positron annihilation into the $D_s^+D_s^-$ final state

Peter Lichard; Josef Jur\'a\v{n}

arXiv:2507.05181·hep-ph·April 3, 2026

A subthreshold pole in electron-positron annihilation into the $D_s^+D_s^-$ final state

Peter Lichard, Josef Jur\'a\v{n}

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TL;DR

This paper presents evidence of a subthreshold pole in electron-positron annihilation into D_s^+ D_s^- final state, indicating a resonance consistent with the G(3900) state, based on precise BESIII data.

Contribution

The study identifies a subthreshold pole in e+e- to D_s^+ D_s^- process and links it to the G(3900) resonance, providing new insights into charmonium-like states.

Findings

01

Evidence of a subthreshold pole at 3896 MeV

02

The pole is associated with the G(3900) resonance

03

Resonance behavior observed in e+e- to D D̄ processes

Abstract

Using precise data from the BESIII collaboration, we obtained compelling evidence of a subthreshold pole in the $e^{+} e^{-} \to D_{s}^{+} D_{s}^{-}$ process with mass of (3896 $_{- 22}^{+ 13}$ )~MeV. The latter suggests the identification of this subthreshold pole with the $G$ (3900) state, which behaves as a resonance in the $e^{+} e^{-} \to D \overset{ˉ}{D}$ processes.

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