New narrow resonance in the $e^+ e^- \to φη$ data by Belle collaboration

Peter Lichard

Published 2023-09-25Version 1

Fitting the recent $e^+e^-\ra\phi\,\eta$ data by the Belle collaboration with a theoretical formula reveals, besides the dominant $\phi(1680)$ resonance, two narrow resonances: expected $\phi(2170)$ resonance and an unexpected resonance with the mass of about 1851 MeV. Close proximity to the $X(1835)$ resonance suggests that the new resonance may be interpreted as the $p \bar p$ baryonium in an excited state. Follow-up analysis found the same resonance also in $e^+e^-\ra\omega\,\eta$ data by CMD-3 experiment.