New narrow resonance in the e+e-→ϕ η data by the Belle collaboration

Fitting the recent e⁺e^-→ϕ η data by the Belle Collaboration with a theoretical formula reveals, besides the dominant ϕ (1680 ) resonance, two narrow resonances: expected ϕ (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 p ¯ baryonium in an excited state. Follow-up analysis found the same resonance also in e⁺e^-→ω η data by the CMD-3 experiment.