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

TL;DR

The paper reports the discovery of a new narrow resonance at about 1851 MeV in $e^+e^- o \phi\,\eta$ data, potentially identified as an excited $p ar p$ baryonium state, supported by additional observations in related channels.

Contribution

It presents the identification of a previously unobserved narrow resonance near 1851 MeV in $e^+e^-$ annihilation data, suggesting a possible baryonium interpretation.

Findings

Discovery of a narrow resonance at 1851 MeV in $\,\phi\,\,\eta$ data.

Observation of the same resonance in $e^+e^- o \,\omega\,\,\eta$ data.

Potential interpretation as an excited $p ar p$ baryonium state.

Abstract

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.